home > Construction materials > How to install a protective cover on a trimmer. How to make a trimmer from an angle grinder and other electrical appliances with your own hands Other non-standard ways to use the tool

How to install a protective cover on a trimmer. How to make a trimmer from an angle grinder and other electrical appliances with your own hands Other non-standard ways to use the tool

In the summer, to keep your summer cottage looking neat, you have to mow the grass regularly. A trimmer, a lightweight manual lawn mower in the form of a cane, helps you quickly cope with this.

A kind of electric scythe, but instead of a blade it has a fishing line.

A well-known disadvantage of trimmers is that you cannot work with them without special protection (mask and glasses): the grass scatters at high speed in different directions, getting into your face and eyes.

The reason for this is the small shield above the rotating line.

To solve this problem, I trimmed the “original” plastic shield, leaving only the third part attached to the rod.

Then I made a new one from an aluminum sheet 0.2 mm thick and 250x250 mm in size, and attached it with two screws from above to the remaining part of the former shield.

Instead of aluminum, you can use a plate made of rubber or linoleum, but then the shields made of these materials will have to be secured with steel wire so that the edges do not accidentally get caught under the rotating fishing line.

Upgrading the trimmer guard

During the operation of any electric trimmer, one major drawback appears: the resulting grass juice and haylage scatter far to the sides and upwards, covering the mower from head to toe with greenery. You have to use special clothing and a mask to protect your face and eyes, but dust gets into your boots and settles on your headgear. After just an hour of work, the mower turns out to be “all covered with greenery, absolutely all”! You have to spend a lot of time on subsequent “sanitation”.

The reason is that trimmers have an excessively small guard over the rotating line. In mine, for example, the shield occupies only a sector, which on the watch dial corresponds to the numbers from 4 to 8, which is clearly not enough.

To eliminate this drawback, I cut off the plastic shield in my trimmer and left only the third (central) part attached to the rod. Then I made an enlarged shield from an aluminum sheet 0.2 mm thick and 250x250 mm in size, which I attached with two screws from above to the remaining part of the former shield (see figure).

As a result, the resulting new shield began to cover the entire semicircle of rotation of the line facing the mower, protecting him from flying greenery. The effect of this modernization was remarkable! Now even boots don’t get dirty above half the tops.

If there is no aluminum sheet, you can use a rubber or linoleum plate. To prevent the edges of such material from drooping, they will have to be reinforced on top along the perimeter with steel wire. In this case, the peripheral parts of the material must be held in a raised state by the wire. The shield material must be attached to the wire in precisely these places, inaccessible to the rotating fishing line.

Anatoly Yarusov, Minsk

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Below are other entries on the topic “How to do it yourself - for a homeowner!”

Repairing the trimmer coil The button has worn out...

How to make a pendant for knives...

I came across the issue of carefully and quickly mowing the grass near the fence of my dacha a long time ago, when I had to learn to use an ordinary scythe - a Lithuanian one.

I immediately thought that it wouldn’t hurt to buy a simple lawn mower, which was not easy to buy at that time. Therefore, I decided to experiment with a homemade design.

As a result, I gained practical experience in mowing grass, thanks to which I was able to buy a trimmer that is well suited for my purposes.

Based on the knowledge gained, I give advice to the home craftsman on how to make it with his own hands electric trimmer from used equipment based on an electric motor from a vacuum cleaner, drill or grinder with pictures, diagrams and photographs that allow you to repeat a similar design.

Please note that my lawn mower was assembled a quick fix one of the most available materials. Its fastening was made for reliable operation without complying with any design conditions, but ensuring basic safety requirements. So do not judge strictly for the unpresentable appearance of the structure.

Safety regulations

I’ll start with this section to remind you: any homemade lawn mower design can cause harm to health. This requirement is especially relevant for:

electrical equipment;
parts of mechanisms rotating at high speed.

Let's look briefly at these two factors.

Electrical hazard of trimmer

Electricity doesn't care about your health. It creates a current path where it is provided Better conditions and less electrical resistance. : clothes, surrounding objects, a parked car. There is nothing strange about this. You need to take care of yourself and use protective equipment.

When creating an electric trimmer with your own hands, immediately pay attention to the strength and quality of the insulation of all current-carrying parts, both inside the engine and on the external circuit. Its installation must be carried out by a qualified worker.

When working with a homemade trimmer you need to:

All three devices listed should be checked. They must meet safety requirements for technical characteristics, settings, and be properly adjusted.

Mechanical circuit hazards

Commutator motors develop very high rotation speeds. For vacuum cleaners they can range from 11,000 to 30,000 rpm. This is quite enough for a small pebble, piece of wire or wood chips to fly out from under the cutting head, like a bullet from a rifle.

The difference will be that the direction of the bullet is chosen by the sniper, and the pebble from the lawnmower is chosen by chance. It is impossible to predict where he will fly. Therefore, when working it is necessary:

ensure a stable body position, which is general requirement ;
protect yourself with thick clothing made from natural cotton fabrics or denim;
wear sturdy shoes rather than open sandals;
use goggles or a protective mask.

Lawn mower made from an electric motor from a vacuum cleaner

My design consists of:

commutator motor;
its attachment point on a wooden rod;
homemade cutting knife;
support wheel;
switch buttons;
protective covers.

Electric motor

The design of the lawnmower is based on a collector motor from an old Soviet-era 300-watt Buran vacuum cleaner. Its intended use had to be abandoned after, as a result of long-term use, various gaskets began to wear out and air movement was disrupted. I was tired of eliminating emerging fistulas that affected pressure and suction, so I bought a replacement.

Appearance The assembled engine side trimmer is shown in the photograph. Since it is no longer in use, it is covered with rust, and the remains of the mown grass have long since dried out and remained stuck to all the parts. I find it much more convenient to work with a factory design.

The engine didn't have to be rebuilt at all. I simply made several fasteners and protective covers using a vice and a hacksaw for metal. In the next photo, a cap cut from a plastic bottle is raised, covering the brush assembly.

The working knife is poorly visible in this picture, but it can be seen above.

For greater clarity, I lifted the protective cover with my finger and showed a close-up of the engine from the brush side. Here, all factory parts remain in working order.

WITH opposite side The capacitor installed at the factory is working.

Barbell

All parts of the homemade trimmer are attached to a dried wooden stick without any processing. I drilled mounting holes in it, and screwed some parts, for example, the handle bracket, with a piece of wire.

All these connections are visible in different pictures.

Homemade grass knife

It is noteworthy that when I removed the fan impeller, I saw: the free space on the rotor shaft is ideal for mounting homemade knife. I didn't even have to select the nut and gaskets.

Bad experience

At first I tried attaching wires of different diameters to the shaft. She started to mow the grass normally, but stopped very quickly. Its structure does not withstand mechanical tensile and bending loads developed high speed engine and oncoming grass. Therefore, trimmer manufacturers produce different varieties fishing line

Method of making a lawn mower

I made a knife for a homemade trimmer using the following technology:

took a metal plate made of mild steel;
cut it into a rectangular shape;
drilled a hole in the center along the diameter of the shaft;
sharpened the edges to reduce the stress when mowing.

To show how to attach it through the factory bushing, I unscrewed the nut a little and simply bent the knife itself by hand.

Support wheel

The main disadvantage of this lawn mower design, like all trimmers with a bottom-mounted electric motor, is the need to exert great physical effort to keep the blade in the desired plane when mowing. At the same time, the worker’s muscles tense, and he himself quickly gets tired. Need emphasis on the ground.

Therefore, I attached small wheels from an old children's cart to the motor housing and rod using adapters. They are lightweight, but make the job much easier.

Switch button

It must be placed on the handle directly under the palm.

This way you can quickly turn off the trimmer.

Design selection

I used a special fastening of a button with self-return from one of the used measuring electrical devices. It is simply screwed to a soft wooden rod copper wire in isolation and for better clarity, the photo is shifted from its axis to the side.

The switching capacity of the contacts can withstand the power developed by a 300-watt motor with a reserve.

I draw your attention to the self-return function. I do not recommend using a regular switch. If while working you accidentally fall, lose your balance, or something unexpected happens, and the running trimmer slips out of your hands, you will not be able to stop it instantly. Sharp knife will cut everything that gets in his way.

To prevent accidents in such situations, I even use a factory trimmer. I believe that safety and health are more valuable than such amenities with risks.

Installation method

Random access to electrical contacts wires are limited by the insulation of a special insulating tape.

In the next photo I deliberately exposed them. This will give you a better view of the fastening and connection.

By the way, I did the soldering the same way. Although there are many other designs, described in a separate article.

The wires to the button of a homemade lawn mower are simply wrapped around the rod, and with reverse side twisted and soldered into the gap of one power cable core. The connections are insulated with electrical tape and covered with protective cambrics.

According to safety rules, any, not zero. But in the design under consideration, determining its position each time does not make much sense, and the homemade trimmer was created for the sake of experimentation, and not long-term work. It has proven itself quite satisfactorily when mowing the lawn.

Protective covers

You have already seen their image in all the above photographs. On top of the engine, to protect the collector assembly during operation, I simply inserted a cut neck from a plastic bottle.

We managed to make the lower cover from the body of the same vacuum cleaner, cutting out part of the sector from it. I attached it with screws and nuts.

Trimmer from a drill or grinder

The principle of creating a homemade design based on this tool is exactly the same as in my case.

The engine is mounted on the lower end of the rod, and the working knife is made in the form of an attachment.

Knife attachment principle

For a drill, you can screw two nuts onto a regular stud, tightening them with keys, and use the plane of the created stop to install the knife.

A mounting nut will complete this design. If you use wide washers, the fixation will be stronger. The lock nuts can be replaced with one, but it will need to be welded. The back end of the pin is inserted into the drill chuck and clamped like a drill.

The knife hole must be drilled in the center, and the assembled attachment must be well balanced. Otherwise, lateral runout will occur, for which the drill bearings are not designed.

Set the correct direction of rotor rotation with the drill switch. When you turn on the trimmer, the nut should work to clamp the knife, and not unscrew. Otherwise, the knife with sharp edges may fly out of the holder.

Trimmer line attachment

You can make a reel for attaching fishing line with your own hands, but I don’t see much point in this matter. It’s easier to buy it in a store or use it from a broken trimmer.

The fact is that during operation, when the fishing line is shortened, its cutting length can be restored by simply hitting the rotating head on the ground. This function works by maintaining the exact dimensions of the nozzle after complex mechanical adjustments. And disposable fastening of the fishing line requires frequent switching off of the trimmer to replace it.

Take care of your safety first. For this:

remember once again the rules for handling electricity;
do not work without protective covers with open rotating knives;
do not trust strangers without proper training with your dangerous homemade products;
When mowing, do not be distracted, but control the work area. Do not allow children, animals, or random visitors onto it.

A homemade lawn mower helps you experience all the advantages and disadvantages of electric grass mowing, the operating features of such devices, and the need to balance the center of mass. After gaining a little experience in using it, it is easier to choose a factory model that is professionally prepared for long-term use.

A neatly trimmed lawn is not only beautiful in itself, but also in a certain way indicates the status of the owner of the house. Nowadays, it is not difficult to find a lawn mower that is suitable for its performance and design. But there is another option. If you have a medium-power electric motor lying around on the farm, then after spending a few evenings, you can easily turn it into a simple and convenient homemade lawn mower, saving not such a small amount of money that you would have to pay for a branded lawn mower - and even enjoying creativity.

General structure of the lawn mower

In its simplest form, a lawn mower consists of the following components and parts:

Engine.
The frame on which all mower components are attached.
Knives.
Protective casing.
Wheels.
Handles for control.
Control system parts: switch, RCD, power cable with plug.

The frame of the simplest design is a metal sheet 2-3 mm thick with a hole in the middle for the passage of the motor shaft. The sheet is reinforced with a frame of metal corners. The engine is attached to the sheet at the top, a protective casing at the bottom, an axle for the wheels on the sides, and handles for control.

If the motor is flanged, it can be attached directly to the sheet by drilling holes in the latter that coincide with the holes in the flange. If the engine is of a conventional design, two perpendicular corner posts must be welded or screwed to the sheet so that they coincide with the engine feet.

Homemade lawn mower. Fastening the electric motor to the corners.

Holes are drilled in the corners for mounting the engine. If the holes are made in the form of grooves, this will allow the engine to be shifted relative to the frame when mounting, thus changing the distance from the knives to the ground. This design feature will be useful when selecting the optimal grass cutting height. But it’s easier to make holes for different engine height positions.

The central part of the lawn mower is the cutting unit, which consists of a mandrel with two short (or one long) knives attached to it.

Engine

A good option is asynchronous electric motor power 500-600 W and above, with a speed of about 3000 rpm. The big advantage of an asynchronous motor is its low noise level. The higher the engine speed, the better and smoother the haircut. In fact, the quality of mowing is determined not by the speed of rotation of the blades, but by the linear speed of movement of the cutting edge relative to the grass. At the same engine speed linear speed the higher the grip (the diameter of the circle along which the cutting edge rotates), the higher the grip. Therefore, with a large grip (more than 40 cm), the engine speed may be lower. However, in this case, the motor power must be greater in order to overcome the increasing resistance. Practice shows that this option is quite workable: grip - 50 cm, engine power - 1 kW, speed - 1500 rpm. But in principle, a 500 W motor with a frequency of 1500 rpm will mow the grass, although worse. Only with low engine power, you need to sharpen the knives regularly.

To connect a three-phase motor to a single-phase network, it is necessary to use a circuit with working and starting capacitors. There is plenty of information on the Internet about connecting three-phase motors to a single-phase network. It is not difficult to find formulas for calculating the required capacitance of capacitors. In practice, they take approximately 200 uF for a motor with a power of about 2 kW. For a power of 500-600 W, 60-80 uF is sufficient.

When making a casing for the engine, you need to provide holes for cooling the engine.

You can make a lawn mower with your own hands using a conventional electric drill with a speed of up to 3000 rpm. Coming up with a way to attach a drill to a frame is not that difficult. However, you need to understand that in terms of reliability and duration of continuous operation, the drill cannot be compared with an asynchronous motor, so if you have to mow a relatively large area, preference should be given to the latter.

A drill is more suitable for making a homemade trimmer.

In the case of a drill, it is very simple to mount the knife. The knife with the hole in the center is clamped with a nut on the bolt, and the bolt is clamped in the drill chuck.

Mandrel

The simplest mandrel design is a disk or strip with a flange in which there is a hole equal to the diameter of the motor shaft. The flange is put on the shaft and locked on it, knives are attached to the disk or strip. The diameter of the disk or the length of the strip depends on the planned working width and the length of the knives. As a finished mandrel, you can use a pulley with a landing diameter suitable for the shaft of the existing engine. This will solve two problems at once - centering the mandrel and its fastening. But the pulley must be reliable enough.

The mandrel must be securely fastened to the motor shaft. This is usually done using bolts screwed into the flange perpendicular to the shaft axis.

You can use a stone holder for a sharpener as a mandrel.

To prevent grass from wrapping around the shaft, it can be covered with a tin can.

If a suitable pulley or other suitable parts are not found, you will have to order the manufacture of a mandrel from a turner or make it yourself from a pipe of a suitable diameter and a strip or circle welded to it. There are three problems here: finding a pipe of suitable diameter, ensuring the perpendicularity of the welded strip or circle with respect to the pipe, and centering the mandrel after its manufacture. With some effort, all these problems can be solved.

Knives

Flat tool steel with a thickness of 2-3 mm and a width of 20 to 50 mm is used as knives. The thinner the knife, the better it cuts. However, a thick knife is stronger, which, given the obstacles encountered in its path in the form of bumps, various foreign objects and even stones, is very important.

The design of knives has two main options. The first is a knife in the form of a long strip, which is attached to the mandrel symmetrically relative to its axis. The length of the knife in this case is equal to the width of the grip - usually 30-50 cm. The sharpened ends of the strip act as cutters. In this case, the knife and the mandrel can be one integral part in the form of a plate, to which a flange with a mounting hole is welded or riveted.

The second option is two short knives 50-80 mm long, which are attached to the edges of the mandrel at an angle of 180° to each other. They can be positioned straight or with a slight slope. The knives can be secured with two or one bolt. The first method is more reliable, however, fastening with one bolt allows the knife to fold (without breaking or deforming) when it hits an obstacle - a stone or a bump. The fastening of folding knives must be inspected regularly, because... Over time, the screws may wear out.

The steel for knives must be sufficiently hard, but not brittle, otherwise the knives may break, which will not only require their replacement, but also create the risk of injury from a flying piece. The experience of amateur craftsmen shows that wood hacksaw blades 2 mm thick are very suitable as a material for lawn mower blades. The technology for making a knife from them is simple. Two strip-shaped blanks are marked on the canvas (or one long knife is made from the canvas with sharpening at the ends and holes for fastening in the middle), which are then cut out with a grinder. Holes for fastening are drilled in the workpieces. After this, all that remains is to sharpen the knives, attach them to the frame and center them.

If drilling holes is problematic, then you can place the blade on a metal surface with a hole slightly larger in diameter than the hole in the blade should be and hit it with a punch. The protrusion formed after the impact is removed with a file (if the metal is soft enough) or with a sharpener. If the hole doesn't respond required diameter, the process is repeated.

In essence, there are many options for making functional knives, as well as materials for making them. The main thing is to sharpen them well, center them (so that there is no vibration) and securely fasten them. When attaching knives to the mandrel, you need to use lock washers and locknuts. Without this, the mounting bolts will unscrew due to vibration.

If possible, it is better to make the cutting edges slightly curved down, like on branded lawn mowers. This will reduce the grass from wrapping around the motor shaft. Or you can make a disk that covers the shaft. Also, if the engine power is close to the power of branded lawn mowers, you can buy a branded lawn mower blade ().

Wheels

The diameter and position of the wheels must be selected so that the knives are located at a distance of 5-6 cm from the ground. This mowing height is considered optimal - both from the point of view of the aesthetics of the lawn and the quality of the haircut. If the grass is cut at too high a height, it will bend, allowing the blades to pass above it and remain uncut. Cutting lower is difficult due to the unevenness of the ground.

There is no clear opinion about what number of wheels is optimal - 2, 3 or 4, among craftsmen operating homemade lawn mowers. 3 or 4 wheels are good because they set the exact distance from the knives to the ground. Two wheels make the lawn mower more maneuverable and allow you to cut grass in any hidden places. In addition, it is easier to find two identical wheels than three or four. However, you can make the wheels yourself, for example from plywood and bearings, so the last argument is not so convincing. Ultimately, the choice remains with the master himself.

If a two-wheeled lawn mower is selected, there must be protection against the rotating blade touching the ground.

If you choose a three-wheeled lawn mower, then two wheels should be on the handle side so that you can lift the front of the mower for a turn by pressing on the handle.

The larger the wheel diameter, the better. A lawn mower with small wheels is more difficult to push through grass.

If the edge of the knives is bent, the opposite cutting edge, up (or rivet blades to them), they will work like a fan, lifting and rotating the cut grass with a flow of air. At the same time, if you make a cut in the casing (in the quadrant where the knives run) and pull a mesh bag or box over it, then the cut grass will be collected in it.

At the end of the article there is a video demonstrating the operation of the second lawn mower.

Without a bag, the grass will be laid in the direction specified by the cutout. Without a hole in the casing, the grass will be crushed, this will be mulching. But for all this you need a fairly powerful engine, and in order to avoid cutting grass from stuffing into the engine, the space between the engine and the knives must be covered with a disk.

Working with the mower will be safer if one of the handles is equipped with a lever that, when released, turns off the power supply to the engine.

Security measures

When starting to make a lawn mower with your own hands, you need to understand the dangers posed by the operation of such devices. If we talk about the main threats, there are two of them: electric shock and injury from rotating knives. Both are considered very serious, so safety measures must be taken very carefully.

It is necessary to carefully insulate all electrical wire connection points - both on the engine itself and on the control parts. The insulation on the supply cable must not be damaged. To power an electric motor, you must have a double-insulated cable with at least 3 cores. The mower body is reliably grounded, for which one of the cable cores is used. Or they must connect the lawn mower to the network using an RCD - a residual current device designed to de-energize electrical devices when a person touches their parts that are energized due to insulation failure.

Do not operate the mower without a protective cover. When working, you need to make sure that there are no people nearby. Broken knives fly out at high speed. And if the operator himself is protected by a casing, then in some designs of homemade lawn mowers, the front area of the mower remains open. It is advisable to mow in rubber boots. This will protect you from the consequences of getting hit various items, which are thrown away by the rotating knife.

Do not use the mower in wet weather or early in the morning when there is dew.

Below is an example of a homemade lawnmower gone wrong.

The engine is completely open, and there is no homemade casing for it, not even a protective disk on the blade side, although there is a huge hole there. There is no cover to protect the lawnmower from flying blades or thrown stones. The handles are welded and their tilt cannot be adjusted; in addition, they cannot be removed when storing or transporting the lawn mower.

Video of DIY lawn mowers:

Homemade lawnmower from a basin

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How to make a trimmer with your own hands

The question of how to make a trimmer with your own hands is always relevant among owners of private houses with small land plot. A neat and well-groomed lawn near the house is not only beautiful, but also safe in terms of the absence of ticks on it.

How to get rid of ticks on summer cottage was told earlier, today the question will be considered - how to make a trimmer with your own hands from the means most readily available for this.

Today on sale you can find various versions of trimmers powered by both electricity and gasoline. However, it is not always possible to buy a trimmer, and in most cases it is not so necessary.

The advantage of a homemade trimmer made from a drill or grinder is that when you need to mow the lawn near the house, the trimmer is easily assembled. When not needed, the drill or grinder is removed from the trimmer and used for its intended purpose.

How to make a trimmer from a drill and grinder

To make a trimmer from a drill, you don’t need a lot of materials and tools. You will also not need to disassemble the drill in order to make a manual trimmer out of it with your own hands.

In addition, a cordless screwdriver can serve as a replacement for a drill, which can be connected to a car battery to increase the operating time of the trimmer.

Making a trimmer from a drill with your own hands

The basic requirements for a homemade trimmer are primarily related to its safety. The knife of a homemade trimmer is very sharp, so the presence of a protective cover on the trimmer is prerequisite.

The same applies to the trimmer handle on which the drill will be fixed. The handle must be made of durable materials, of course it can also be made of wood, but it is better to use an aluminum pipe for these purposes.

In addition, working with the trimmer after its assembly should not only be as safe as possible, but also convenient. Therefore, you should definitely adjust the trimmer holder to your height, maybe install an additional handle on the side, etc.

First, prepare the trimmer handle on which the drill should be secured. To secure the drill, you will need long bolts and metal clamps. The power cord of the drill must be attached to the trimmer handle. The wire must not dangle and pose a danger if it gets under the cutting element of the trimmer.

How to make a trimmer knife: materials

The knife of a homemade trimmer is attached to the drill with a nut and bolt, which is clamped in a chuck. Before doing this, be sure to remember to install a protective cover on the trimmer to ensure your own safety while mowing the grass.

The trimmer blade can be made from tool steel or another very durable material. You should know that the thinner the trimmer blade, the better it will cope with cutting grass. The length of the trimmer blade depends primarily on the protective cover and the cutting width of the grass being cut. Most often, the length of the trimmer knife does not exceed 30 centimeters.

Do-it-yourself trimmer from an angle grinder

The question of how to make a trimmer from an angle grinder with your own hands is solved in approximately the same way as the above-described manufacture of a trimmer from a drill. Here there is only a slight difference in attaching the grinder to the holder. A metal pipe can be selected as a handle for the trimmer, to which at the end you need to weld a plate with a hole for fixing the angle grinder with a bolt.

Small changes also affected the homemade trimmer knife. In the case of using a grinder, the knife is not in the form of a long rectangle. The knife of a homemade trimmer from a grinder is made of a disc for concrete, with pre-cut sharp edges, which are specifically designed for mowing grass.

The question of how to make a trimmer from a drill or grinder can be solved independently. The main thing is not to forget about safety precautions and carefully study this issue.

Only after this, you can safely take on making a trimmer with your own hands.

samastroyka.ru

How to make an electric trimmer with your own hands from a vacuum cleaner or other power tool

I came across the issue of carefully and quickly mowing the grass near the fence of my dacha a long time ago, when I had to learn to use an ordinary scythe - a Lithuanian one.

I immediately thought that it wouldn’t hurt to buy a simple lawn mower, which was not easy to buy at that time. Therefore, I decided to experiment with a homemade design.

As a result, I gained practical experience in mowing grass, thanks to which I was able to buy a trimmer that is well suited for my purposes.

Based on the knowledge gained, I give advice to the home craftsman on how to make an electric trimmer with his own hands from used equipment based on an electric motor from a vacuum cleaner, drill or grinder with pictures, diagrams and photographs that allow him to repeat a similar design.

Please note that my lawn mower was assembled in haste using the most readily available materials. Its fastening was made for reliable operation without complying with any design conditions, but ensuring basic safety requirements. So do not judge strictly for the unpresentable appearance of the structure.

Safety regulations

I’ll start with this section to remind you: any homemade lawn mower design can cause harm to health. This requirement is especially relevant for:

electrical equipment;
parts of mechanisms rotating at high speed.

Let's look briefly at these two factors.

Electrical hazard of trimmer

Electricity doesn't care about your health. It creates a current path where the best conditions and lower electrical resistance are provided for it. You can get an electric shock even from random things: clothing, surrounding objects, a stationary car. There is nothing strange about this. You need to take care of yourself and use protective equipment.

When working with a homemade trimmer you need to:

All three devices listed should be checked. They must meet safety requirements for technical characteristics, settings, and be properly adjusted.

Mechanical circuit hazards

ensure a stable body position, which is a general safety requirement when working with all tools;
protect yourself with thick clothing made from natural cotton fabrics or denim;
wear sturdy shoes rather than open sandals;
use goggles or a protective mask.

Lawn mower made from an electric motor from a vacuum cleaner

My design consists of:

commutator motor;
its attachment point on a wooden rod;
homemade cutting knife;
support wheel;
switch buttons;
protective covers.

Electric motor

The appearance of the assembled trimmer from the engine side is shown in the photograph. Since it is no longer in use, it is covered with rust, and the remains of the mown grass have long since dried out and remained stuck to all the parts. I find it much more convenient to work with a factory design.

The engine didn't have to be rebuilt at all. Just with help electric drill, a vice and a hacksaw for metal, I made several fasteners and protective covers. In the next photo, a cap cut from a plastic bottle is raised, covering the brush assembly.

The working knife is poorly visible in this picture, but it can be seen above.

For greater clarity, I lifted the protective cover with my finger and showed a close-up of the engine from the brush side. Here, all factory parts remain in working order.

On the opposite side, a factory-mounted capacitor works.

Barbell

All these connections are visible in different pictures.

Homemade grass knife

It is noteworthy that when I removed the fan impeller, I saw that the free space on the rotor shaft was ideal for attaching a homemade knife. I didn't even have to select the nut and gaskets.

Bad experience

At first I tried attaching wires of different diameters to the shaft. She started to mow the grass normally, but stopped very quickly. Its structure cannot withstand the mechanical tensile and bending loads developed by high engine speeds and oncoming grass. Therefore, trimmer manufacturers produce different types of fishing line.

Method of making a lawn mower

I made a knife for a homemade trimmer using the following technology:

took a metal plate made of mild steel;
cut it into a rectangular shape;
drilled a hole in the center along the diameter of the shaft;
sharpened the edges to reduce the stress when mowing.

To show how to attach it through the factory bushing, I unscrewed the nut a little and simply bent the knife itself by hand.

Support wheel

Therefore, I attached small wheels from an old children's cart to the motor housing and rod using adapters. They are lightweight, but make the job much easier.

Switch button

It must be placed on the handle directly under the palm.

This way you can quickly turn off the trimmer.

Design selection

I used a special fastening of a button with self-return from one of the used measuring electrical devices. It is simply screwed to a wooden rod with soft copper wire insulation and for better clarity, the photo is shifted from its axis to one side.

The switching capacity of the contacts can withstand the power developed by a 300-watt motor with a reserve.

I draw your attention to the self-return function. I do not recommend using a regular switch. If while working you accidentally fall, lose your balance, or something unexpected happens, and the running trimmer slips out of your hands, you will not be able to stop it instantly. A sharp knife will cut anything that gets in its way.

To prevent accidents in such situations, I even excluded the function on the factory trimmer permanent job by removing the corresponding switch. I believe that safety and health are more valuable than such amenities with risks.

Installation method

Accidental access to the electrical contacts of the wires is limited by the insulation of a special insulating tape.

In the next photo I deliberately exposed them. This will give you a better view of the fastening and connection.

By the way, the soldering was done with the same soldering iron Moment, about which I had the largest number of comments. Although there are many other designs, described in a separate article on choosing soldering irons for home handyman.

The wires to the button of a homemade lawn mower are simply wrapped around the rod, and on the reverse side they are twisted and soldered into the gap of one supply wire of the cable. The connections are insulated with electrical tape and covered with protective cambrics.

According to safety rules, any switch or control button must switch phase, not zero. But in the design under consideration, determining its position each time does not make much sense, and the homemade trimmer was created for the sake of experimentation, and not long-term work. It has proven itself quite satisfactorily when mowing the lawn.

Protective covers

You have already seen their image in all the above photographs. On top of the engine, to protect the collector assembly during operation, I simply inserted a cut neck from a plastic bottle.

We managed to make the lower cover from the body of the same vacuum cleaner, cutting out part of the sector from it. I attached it with screws and nuts.

Trimmer from a drill or grinder

The principle of creating a homemade design based on this tool is exactly the same as in my case.

The engine is mounted on the lower end of the rod, and the working knife is made in the form of an attachment.

Knife attachment principle

For a drill, you can screw two nuts onto a regular stud, tightening them with keys, and use the plane of the created stop to install the knife.

The knife hole must be drilled in the center, and the assembled attachment must be well balanced. Otherwise, lateral runout will occur, for which the drill bearings are not designed.

Trimmer line attachment

You can make a reel for attaching fishing line with your own hands, but I don’t see much point in this matter. It’s easier to buy it in a store or use it from a broken trimmer.

Take care of your safety first. For this:

remember once again the rules for handling electricity;
do not work without protective covers with open rotating knives;
do not trust strangers without proper training with your dangerous homemade products;
When mowing, do not be distracted, but control the work area. Do not allow children, animals, or random visitors onto it.

housediz.ru

How to make a trimmer with your own hands from a grinder, vacuum cleaner, drill, chainsaw

All owners of personal plots are faced with the problem of mowing grass, which grows literally before our eyes, and during the season it is necessary to improve their plot several times. To replace the usual hand braid petrol trimmers and electric trimmers have arrived a long time ago. But the price for them does not decrease and is quite significant for many owners of dachas and private houses. Craftsmen nevertheless found a way out of this situation and learned to make trimmers with their own hands literally from improvised means, using gas and electric tools not intended for these purposes.

From Bulgarian

Most often, a homemade electric trimmer is made on the basis of an ordinary grinder, which is available to every home craftsman. This tool almost ideal for converting into a trimmer. It has more power than store-bought machines and larger number revolutions per minute. In addition, the standard nut used in the grinder to secure the discs already has holes through which it is easy to insert a fishing line (cord).

So, there are many options for what to make a barbell (holder) from. The simplest one is a wooden holder that is longer than for a shovel. An angle grinder is attached to the end of it at the desired angle using regular tape. The fishing line is inserted into the 2 holes of the nut, after which it is tightened. Thus, in a few minutes you get a trimmer with which you can mow the grass without any problems.

For operational safety homemade apparatus, you can improve it by making a protective casing (how to do this will be discussed later).

For advanced masters with welding machine, we can recommend a more advanced design for securing the angle grinder and the protective casing. It is made of an aluminum tube (serves as a holder) and a metal square profile. Looking at the figure below, you can understand the principle of making the holder.

The grinder is secured to the holder with bolts inserted into the holes that are intended for attaching the handle to the device.

The following photo shows what this structure looks like from below.

By the way, you can also screw the holder (bar) to the holes for attaching the handle when you want to make a simple trimmer that is easy to assemble and just as easy to disassemble if you need to use the grinder for its intended purpose.

To make it more convenient to hold the trimmer in your hands while working, and it does not rotate around the axis of the rod, you can attach a side handle made of bent pipe.

From a vacuum cleaner

A trimmer from a vacuum cleaner engine is made according to the same principle as from an angle grinder. The motor must be mounted on a rod, and either knives, plastic or metal disk, into which to insert the fishing line. The top of the cutting tool is covered with a protective casing.

To dust and fine particles cut grass does not fall into the motor removed from the vacuum cleaner, it can also be hidden in a plastic casing made of sewer pipe as shown in the following photo.

Since the motor in the vacuum cleaner is high-speed, it needs to be cooled. Therefore, under the washer into which the fishing line is inserted, it is recommended to insert homemade disk with slotted and curved blades so that it acts as a fan that creates a vacuum. It is required so that air is sucked through the hose from above and cools the engine.

In order to ease the load on the hands of the mower operator, the unit can be installed on a platform with wheels. In this case, you will get something similar to a lawn mower.

To secure the fishing line, you can also use either a pulley with a suitable mounting hole or a plastic wheel from a cart.

From a drill

The simplest mower is made in a matter of minutes from a drill or screwdriver. But first you must make a knife from a sharpened metal plate with a hole drilled in the center. A bolt is inserted into this hole and tightened with a nut.

Since a drill with this attachment does not have a protective casing, such a tool is quite dangerous for the user. To protect yourself, you can place the drill, like a grinder (discussed above), on the handle of a shovel or on aluminum pipe.

Also, to protect the user of the mower from knives, a casing can be attached to the drill (attached to a plastic pipe and placed on the body of the device).

The drill is attached to the rod using clamps.

From a chainsaw

Many different attachments have already been invented for chainsaws that expand the capabilities of this unit, for example, a cultivator, a drill, a boat motor, and also a scythe attachment. You can see what it looks like in this video. If you want to make a trimmer out of a chainsaw, the most you can make is a lawn mower on wheels, since the engine of the unit is quite heavy, and it will not be possible to apply the above-described options for making trimmers (with a bottom drive) to it.

Therefore, the trolley is made first. It can be welded from a 25x25 mm corner. The frame dimensions should be 500x600 mm. The wheels are attached to the corners of the frame.

When installing the trolley handle, make sure that it does not block the winder (starter).

The gasoline engine is installed (screwed through the holes to secure the tire) onto the frame so that the gearbox is rotated 90 degrees and the shaft is at the bottom.

Now all that remains is to attach the cutting tool to the shaft of the unit. This is done as follows.

It is necessary to weld a small piece of pipe, 80 mm long and 50 mm in diameter, to the “star” of the device. It is better to cut the pipe on a lathe so that the ends are perfectly straight.
Next, find a pipe with a slightly larger diameter - equal to 58 mm. It also needs to be cut to a length of 80 mm. Thus, you will receive a telescopic shaft, which is connected using 2 bolts (m6) located opposite each other. The bolts must have locknuts. Below is a diagram of how the trimmer head is made, which is used to secure the cutting tool.

Several holes need to be made in the telescopic pipes so that the height of the knives above the ground can be adjusted.

It is better to make a knife of such a design as in the following figure.

Due to the fact that movable knives are attached to the disk with rivets, they will simply bounce off when they encounter a stone or a dry branch. This will protect the shaft and gearbox from damage that may occur when the tool jams.

The rivets that hold the knives to the disk must be metal.

The diameter of the disk (made from 4 mm sheet steel) should be 180 mm. The knives are made from strips 30 mm wide and 120 mm long, cut with a grinder from a hacksaw blade for wood.

DIY trimmer knife

If you need to mow plants with thick or tough stems, then ordinary fishing line will not cope with this task. Therefore, you cannot do without a special metal knife. Trimmer knives can be bought at a specialized store, or you can make them yourself, for example, from an old circular saw blade (without soldering). The knife is made as follows.

Homemade protective casing

If you are making a homemade mower, then you will definitely need a protective cover. It will protect your eyes, body and legs from injury from small pebbles and knife fragments if they break.

The trimmer housing can be made from a sheet of aluminum or thin sheet metal.

In this way, you can make and install a protective cover on a trimmer purchased in a store if the shield has cracked for some reason. The shields in factory devices are made of plastic and often break if you unsuccessfully hit the trimmer head on the ground to lengthen the fishing line.

Trimmer belt

For more comfortable work with the trimmer, if you intend to process a large area covered with grass, it is advisable to use a special belt. This device relieves fatigue from the hands and back of the mower operator and greatly facilitates the process when compared with the same work, but without a belt.

There are shoulder straps and backpack straps. The shoulder strap is the simplest device and consists of a loop with two or one latch (carabiner), with which it is attached to the mowing unit. A plastic plate is usually attached to the second carabiner, protecting the operator's side from pressure from the trimmer bar.

The shoulder strap is usually used with lightweight trimmers weighing 3-4 kg. For heavier units it is more convenient to use a backpack belt.

A trimmer belt can be easily ordered online or purchased in a specialized store that sells these devices and their accessories.

The price of backpack belts starts from 250 rubles and above.

If you want to make it yourself, then any housewife, looking at this device, can easily sew it from improvised materials (old belts and belts). You may have to buy buckles and carabiners. But we still recommend buying a ready-made backpack suspension and not wasting time and money on making a device of worse quality than the ready-made one.

tehnika.expert

Homemade products from a screwdriver: electric generator, grinder, trimmer, lawn mower, engraver, hedge trimmer

The screwdriver is widely used in various fields of activity for working with fasteners different types: self-tapping screws, screws, bolts with nuts, furniture confirmations, screws and others. This power tool can also be used to drill holes in different materials, for example, in various metals, lumber, and concrete. Wherein functionality of the model being used are determined by the magnitude of its power and torque, and the presence of a shock function.

From a screwdriver you can make a variety of equipment and tools at home household use. In addition to the power tool itself, conversion in many cases will require additional parts and materials. But homemade devices will still cost less than factory-made analogues, allowing automation and making them more efficient. manual labor.

Ideas for homemade equipment using a screwdriver

The entire range of screwdrivers is divided into corded and cordless models. Both types of products operate using electrical energy, which drives an electric motor. Only the electric motor itself in network devices is designed for an alternating voltage of 220 V, while in battery-powered equipment it is designed for a constant voltage of different values, for example, 12 V, 14.4 V. These design features together with the technical characteristics, they largely determine what kind of homemade products can be assembled from a screwdriver.

Electricity is one of the main types of energy used by humanity. Operates using electricity Appliances, industrial equipment, machines, power tools. The work is performed by electric motors different designs and power supplied by alternating or direct current. For this reason, on the basis of a screwdriver or from its individual parts, the following can be assembled: technical devices:

garden grass and branches shredder;
trimmer (electric scythe);
camping manual generator;
engraver (mini-drill, dremel, drill);
wind generator;
lawnmower;
grinder;
mini-machines: drilling, grinding, surface planer, lathe, sawing, sharpening;
tool for tying reinforcement;
gate opener drive;
means of transportation for children: ATV, bicycle, scooter;
a small ice auger, a hole drill, a construction or kitchen mixer.

The powerful impact model can also be converted into a concrete compactor using a special attachment.

The implementation of each option takes different times and requires additional (insignificant) costs, or is done without them at all.

Assembling a manual camping electric generator and a homemade wind generator

Using battery-powered models of the tool, it won’t be difficult to make a homemade generator that will produce electricity when you rotate the attached handle by hand. This device will be useful in hiking conditions. To make a dynamo, you do not need to radically modify the product. Everything necessary to create a camping generator is already included in the design of the device; only minor modifications will be needed.

Using the created equipment it will be possible to charge 6 or 12 V batteries.

For remodeling, a power tool with an operating voltage of 18V or higher is suitable. The modification is carried out in the following way:

disassemble the electric screwdriver;

carefully unsolder the electronic board;
instead of batteries, they install a diode bridge that is suitable in terms of parameters (dimensions, technical characteristics) inside the battery case;

make a comfortable handle with a handle;
the end without a handle is secured in the chuck.

The final design after the manipulations will look something like the photo below.

A diode bridge is necessary so that the handle of the electric generator can be turned in any direction. Instead of a handle, you can insert an attachment with blades. Then you will get a simple wind generator.

An electric generator powered by wind power is also made in a different way, in the form of a weather vane. In this case, do the following with the battery device:

disassemble the screwdriver;
take out the electric motor by disconnecting its contacts;
remove the cartridge with gearbox (rotor part);

the electric motor shaft is inserted into the chuck, clamping it;
a round metal plate about 1 mm thick is bolted to the gearbox gear, which will serve as the basis for fixing blades made, for example, from plastic pipes;
a clamp with a clamp is placed on the shaft between the chuck and the gear;

cut out a rectangular base from plywood or thin metal;
using a clamp with a clamp, attach the engine with the cartridge to it, drilling holes for the mount in the right places;

make a casing to protect the wind generator (from precipitation, dust and other unforeseen influences), for example, from under coffee can;
insert the base with the motor and cartridge inside, securing the elements with glue, and the lid with sealant;

blades are made by attaching them to the round plate of the unit;
make a weather vane;
mounted on one of its ends assembled generator;

connect the wiring to the motor outputs;
use a multimeter to check the output voltage by rotating the blades by hand.

There are many options for wind generators. They even attach the entire screwdriver to the support, equipping it with an attachment with blades.

Converting a screwdriver into an angle grinder

If corner Sander If it breaks or is missing altogether, it can be temporarily replaced with a cordless or corded electric screwdriver. However, there are various options for remodeling. The easiest way is to use ready-made or homemade attachments or adapters. An example of an adapter is shown in the photo below. One end of it is fixed in the cartridge, and a disk is attached to the other.

Another option that allows you to convert a drill-driver into an angle grinder is to use a special type of attachment equipped with a gearbox. When implementing the method, the power tool is disassembled, its gearbox is removed, and an attachment is installed in its place. After the transformations, you will get a tool similar in appearance to an angle grinder.

It should be taken into account that such special nozzle It is expensive, and modification work requires a lot of time.

Homemade attachments made from hairpins suitable diameter, nuts and washers. They are even used with cordless electric screwdrivers.

The efficiency of homemade grinders is significantly lower than that of factory grinders. This is due to the large difference in the speed of rotation of the attachments: approximately 3000 rpm for a screwdriver versus about 11,000 rpm for an angle driver grinding machine. The insignificant amount of power together with the low speed significantly limits the functionality of the device.

The devices made should be used only in emergency situations. Due to the possibility of reverse on the tool being remade, it is necessary to monitor the direction of rotation of the disk so as not to injure yourself.

Converting a screwdriver into a trimmer or lawn mower

To make an electric scythe with your own hands, you will need the following parts and materials:

a piece of plastic pipe about 2 m long;
soldering iron with soldering kit;
fasteners: self-tapping screws, bolts with nuts;
45 degree plastic corner;
pipe plug;
12 V motor from an electric screwdriver and a battery from it;
the wire;
adapter from 40 to 50 mm for plastic pipes;
power button;
plastic bucket;
contact clips (crocodiles) – 2 pcs;
blades from stationery knives.

The work uses a pipe and an angle to it with a diameter of 40 mm.

The conversion process is carried out as follows:

Having disassembled the electric screwdriver, take out the motor;
attach it to the plug, having previously marked and drilled mounting holes in it;

attach the electric motor with 2 screws;

solder the output to the motor;

install the electric motor by inserting its wiring into the pipe;

mark the location of the future switch with a marker on the tube;

connect to the wiring switch, mount it;

contact clamps are attached to the ends of the outgoing wires to allow quick connection to the battery;

a battery holder is made from the adapter;

connect the drive, connect the adapter to the tube;

using a conventional terminal clamp, the nozzle is connected to the motor shaft;

a protective casing is made from a plastic bucket;

glue the part to the pipe;

check the functionality of the structure.

The created device will allow you to mow only grass with soft stems. There are many different options for lawn mowers based on networked models of drills and screwdrivers. The photographs below show two homemade products.

First, a base is created from metal, plywood or other materials, to which wheels are then attached, as well as a control handle. The electric screwdriver is secured with clamps or to the stand. A cutting attachment is inserted into the chuck. To protect the feet from flying grass, a cover is attached to the back of the base. Power is supplied via a button or directly from the network.

To assemble a sufficiently functional lawn mower, you need to take a drill-driver with a power of 0.5 kW or more.

Engraver assembly

A cordless or corded model of an electric screwdriver can be turned into an engraver, which is also called a dremel, drill, mini-drill, or straight grinder. To do this, you just need to buy an attachment in the store and grind any bit to fit it.

Homemade cartridge will allow you to use a variety of accessories designed for Dremels.

The following video demonstrates the process of creating a flexible shaft engraver.

Making a garden shredder

Garden shredder for grass and thin twigs (less than 1 cm thick) can be made on the basis of a corded drill-driver.

Create an aggregate like this:

choose a suitable container, for example, zinc boiler;
a hole is drilled in the center of the bottom for the shaft on which a knife or several blades will be fixed;
make wood or metal carcass to install the container or place it on the edge of the table;
a drill-driver is attached to the frame or bottom of the boiler, which is equipped with knives;
install an on/off button;
make a slot in the side of the container - cut out a rectangle in front of the bottom 10 by 20 cm;
A sleeve is made from tin for disposing of crushed plants;
attach it to the container;
check the functionality of the unit.

Knives are easiest to make from hacksaw blades. They need to be installed with the point down. In this case, you can make several versions of blades for different grasses. If you make an attachment in the form of knives for a drill-driver, then you can simply chop the grass in a bucket or other suitable container.

Screwdriver machines

Craftsmen have made many different-purpose machines from screwdrivers. They cope well with everyday tasks.

If you need to work professionally, then you cannot do without more serious equipment.

One of the options for converting a drill-driver into drilling machine, demonstrated in the video below.

A way to create a simple one lathe shown in the video below.

It is also possible to assemble the simplest milling and grinding machines based on a drill-driver, which is demonstrated in the following videos.

Other non-standard ways to use the tool

Non-standard use of a screwdriver is not limited to the options considered. The video below shows how to use this power tool as a drive for an ATV and for opening doors (gates), for drilling ice, as a mixer. The video also contains other non-traditional options.

Using a housing with a battery, you can make a good flashlight. The whole assembly process LED lamp demonstrates the video below.

How to adapt an electric screwdriver motor to make an electric bicycle is shown in the videos below.

Another version of a bicycle with a motor contains the video below.

Using a hook inserted into a screwdriver chuck, you can knit reinforcement during the construction of various objects. The following video demonstrates how this is done.

By connecting the tool to the auger of a manual meat grinder, you can automate the process of twisting vegetables and meat.

It should be borne in mind that homemade products of this kind are often very limited in load. But if they don’t provide any practical benefit, then entertainment is guaranteed.

The unconventional use of a screwdriver is not limited to this. Craftsmen are constantly putting forward new ideas, and at the same time their practical implementation is taking place. Other specialists adapt homemade devices to their own needs, thereby obtaining various modifications of homemade equipment. You can also come up with something on your own, showing technical knowledge and imagination, giving free rein to your imagination and creativity. The main thing to remember: when starting to manufacture various devices, you must take into account that the created mechanisms are safe.

How to put a knife on a trimmer

With the arrival of summer, many homeowners are worried about the question of how to put a knife on a trimmer. More pressing questions are why and when to purposefully replace the fishing line on a lawn mower with a stronger cutting element. In our article we will try to sort it all out and give useful tips summer residents.

Why you need to put a knife on a trimmer

A trimmer with a knife installed on it is more convenient total use for more comfortable mowing of tall and coarse grass in the countryside. In such cases, the line on the brush cutter does not control. Installing a knife on a Chinese trimmer: how to remove and install old chain. The narrow one breaks very quickly. Discussion of the stihl fs 55 trimmer on the casing below, I don’t understand how to install the bobbin. The introduction of a thick 2.3 mm cord or homemade rods with cables forces the vegetation to wind onto the spool. This increases the load on the engine. As a result, the piston group and other moving parts of the unit wear out very quickly.

If you mow weeds with an electronic trimmer without a knife, using fishing line alone, even a thick one with a shaped cross-section, the problem will not be solved. There is always a risk of overheating the electric motor and damaging the flexible shaft. And it's all about the high torque of the electronic motor. The grass wound around the spindle creates strong resistance to the shaft, reminiscent of a speedometer cable, which cannot withstand it and gets twisted.

In order to protect equipment from early wear and tear, manufacturers have provided the possibility of installing special knives on trimmers. The design and shape of the existing cutting parts allows you to easily handle not only coarsened and overgrown grass, but also successfully fight with young bushes.

What knives to put on electric and lawn mowers

Before you take a knife and put it on a lawn mower, let’s find out what they are and in what cases they are used. Now manufacturers offer consumers a huge number of types of these Supplies. In general, all cutting tools intended for mowing grass can be systematized:

By the type of material from which it is made;
According to the shape of its cutting blades.

The main material for the production of trimmer knives can be plastic or metal. The implementation of such consumable parts almost entirely depends on two characteristics:

Assembling the protective cover of the Huter trimmer

Manufacturing of protective casing For trimmer.

Trimmer protective cover

Motokosa. How to replace a damaged shield. The shield got damaged within a few days. Maybe I'm unlucky. In high

A straight shaft for a gasoline trimmer and a curved one for an electric trimmer

Its design features do not allow placing a metal knife on an electric trimmer.

The curved rod of the unit reduces the distance from its working part to the mower’s feet. If the blades collide with a stone or other hard object, the scythe is thrown towards the feet.
The high torque that we mentioned above, in the event of a collision between a metal blade and a hard object, transfers a large load to the flexible shaft of the trimmer and its motor. What causes their premature failure.
The handle of an electric scythe most often does not have a limiting bar that acts as a stop. But you should not rely only on them, since this is not what the casing of the cutting trimmer is designed for. This does not exclude leg injury.

It is these features that allow the use of exclusively plastic knives on trimmers with electric motors. When colliding with an obstacle, the blades are destroyed, thereby protecting the mower’s legs from possible injury.

Plastic knives work well with overgrown and dry grass. They can mow down nettles and burdock stems.

The use of metal knives only on gasoline trimmers is also due to design features.

The straight design of the boom increases the distance to the legs, which ensures complete safety for the mower.
Comfortable U-shaped and J-shaped handles allow you to hold the tool firmly. The D-shaped handles of the lawn mowers are equipped with a limiter that rests against the leg of the mower, which does not allow the head to be allowed to approach the legs when meeting cutting disc with a solid obstacle.
Clutch gasoline engine allows you to smoothly gain speed to the optimal level. And when the blade collides with a hard surface, it is able to absorb part of the impact.

How to properly place a knife on a trimmer

Put cutting a knife onto a trimmer is not that difficult. The manufacturer equips its tools with a special pin that allows you to lock the gearbox and a key with which you can unscrew the spool with fishing line. The most important thing is to observe safety precautions and the sequence of assembly and disassembly when changing cutting elements.

The algorithm for installing the knife on the trimmer is as follows:

We remove the protective casing;
We block the drive. To do this, you need to align two holes - in the shaft hub and in the gearbox cup. After aligning them, insert a pin into the holes;
Unscrew the spool with fishing line clockwise from the hub or fastening nut holding the boot (if the trimmer has not yet been used);
Next we install cutting knife, so that the slots on the hub washer coincide with the recesses in the hole of the cutting disc;
Install the boot;
Tighten the fastening nut (counterclockwise) while holding the locking pin;
Tighten it using a tubular wrench;
We return the protective casing to its place.

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