How To Put A Disc On A Lawn Mower

This simple operation sometimes baffles even experienced locksmiths or users of an angle grinder. The reason is that the disk is fixed with a special nut. The nut has 2 or 4 holes in which a special key is inserted. This key has always been attached when purchasing an angle grinder. Perhaps he is now included in the kits.

How To Put A Disc On A Lawn Mower

According to the instructions for the angle grinder, press the lock, which is located on the back of the gearbox. When the shaft is fixed, use a special key to unscrew the nut and change the disk. But it is difficult to loosen the nut if it is not jammed. And it clamps it with such a nut almost always. Attempting to unscrew the drive breaks the latch behind the gearbox.

What way out of the problem is suggested by experts and amateurs

  • Install a newspaper gasket under the nut;
  • Install a gasket from a plastic bottle under the nut;
  • Replace the nut with a nut of a different design.

What is a gasket from a newspaper. This is a paper washer on the size of a nut. It is put on the installed disk, and a nut is screwed on top. This piece of paper was a stumbling block, because the safety inspectorate always broadcast the dangers of such a decision.

In the same way, representatives of safety authorities apply to the installation of gaskets from any other materials:

  • Cardboard;
  • Paronitis
  • Gaskets made of various plastics;
  • Rubber gaskets of various thicknesses.

But there is a solution that does not contradict the safety requirements, and allows you to properly install and remove the disk. This is a special nut, which consists of two elements. A nut and a pressure washer. The use of such a nut does not require any linings, because the disc does not jam with it.

If there is no special key at hand, then the craftsmen offer to do without a key. This does not mean that you can do without a key at all, but use a “gas key” or other device. To do this, hold the lock, tighten the nut with a gas wrench and unscrew it. So you can replace a jammed disk, but this is a very inconvenient operation for one person.

There are suggestions to hold the disc by hand and so unscrew. Maybe, but it’s unlikely that it will be possible to change broken disks. It is better to use keys that are designed to remove and install disks.

Some foreign manufacturers of power tools, such as Bosh, produce an angle grinder with easy-to-remove nuts. They reliably fix a disk on a tool shaft, are easily and quickly removed to replace a disk.

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How to remove a bitten disc from an angle grinder

The use of new nuts solves the problems of removing the disc, but what to do with the already-bitten disc? Even if the disk was installed correctly, it is not always possible to remove it. Practice suggests different ways to solve the problem. You can clamp the latch and hit through the extension on the nut holes in the direction of unwinding. This option is only possible with a working latch. But the latch may not withstand such a solution to the problem and break.

The second method is more logical. Under the clamping nut and the lower support washer, there is a gear shaft with grooved chamfers. They put on the lower thrust washer. A standard wrench cannot be installed there. Very narrow. But you can take the usual open-end wrench to “17” and grind it on both sides.

The turned key will enter the gap, install on the chamfers of the shaft and fix it. Now, with any wrench, any nut will be unscrewed, and the disk or its remnants are removed from the angle grinder.

How to put the disk on the angle grinder

Grinding discs have different diameters, different thicknesses and different purposes. Some are made for metal processing, others process ceramics, and others work on wood.

On an angle grinder, you must install a disk of a size that will not exceed the size of the protective casing. The size of the disk to be installed is indicated in the instructions and on the marking table angle grinder.

The thickness of the disk is selected according to the technological parameters of the processed material. All discs (grinding wheels) have their own classification. Disc shape, material abrasion, graininess, hardness, accuracy class and imbalance class are classified. It is the latter value that is responsible for the fact that some discs begin to beat during operation.

The grinding wheel has front and back sides. The front side is the one on which the manufacturer’s marking and corporate drawing are applied. When installing on an angle grinder, the front side should be located on top.

Install the disk in this way. So that during operation, sparks with particles of the processed material fly towards the worker. This is a safety issue. If the angle grinder breaks out of hands, then it will not fly towards the worker.

Therefore, to work with an angle grinder, it is necessary to wear protective clothing or a tight apron. The eyes and exposed parts of the face must be protected with a mask or at least safety glasses.

With the advent of summer, many owners of household plots are concerned about the issue of how to put a knife on a trimmer. No less relevant are the questions of why and when it is advisable to replace the fishing line on the lawn mow with a more durable cutting element. In our article we will try to make out all this and give useful recommendations to summer residents.

  • Why you need to put a knife on a trimmer
  • What knives to put on the electric and lawn mowers
  • How to put a knife on the trimmer
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Why you need to put a knife on a trimmer

The trimmer with a knife mounted on it is most convenient to use for more comfortable mowing of tall and coarsened grass in the country. The line on the lawn mowing in such cases can not cope. Thin breaks very quickly. Using a thick 2.3 mm cord or homemade rods with cables causes the vegetation to wind up on 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 the mowing of the weeds is carried out with an electric trimmer without a knife, only fishing line, even if it is thick with a curly section, the problem cannot be solved. There is always a risk of overheating the motor and damage the flexible shaft. And it’s all about the big torque of the electric motor. The grass wound on the spindle creates strong resistance to the shaft, resembling a speedometer cable, which does not withstand and twists.

In order to protect the equipment from premature wear, manufacturers have provided the ability to install special knives on trimmers. The design and shape of existing cutting elements makes it easy to cope not only with coarsened and overgrown grass, but also successfully deal with young shrubbery.

What knives to put on the electric and lawn mowers

Before buying and putting a knife on a lawn mow, we will find out what they are and in which cases they are used. Today, manufacturers offer consumers a large number of types of these consumables. In general, all cutting tools designed for mowing grass can be classified:

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

The main material for making trimmer knives can be plastic or metal. The use of such consumables is largely dependent on two parameters:

  • Type of lawn mowers;
  • Square mowing.

For safety reasons, manufacturers do not recommend placing steel knives on electric trimmers. Almost all lawn mowers powered by mains and battery are equipped with plastic blades. Depending on the manufacturer, they can be of a single disc-shaped design, with several blades or in the form of a special mowing head for the installation of removable plastic blades.

Straight bar at gas trimmer and curved at electric

To put a metal knife on an electric trimmer does not allow its design features.

  1. The curved rod of the unit reduces the distance from its working part to the legs of the mower. If the blades collide with a stone or other solid object, the braid is thrown to the feet.
  2. The high torque that we mentioned above, in the event of a collision of a metal knife with a solid object, transfers a large load to the flexible shaft of the trimmer and its motor. What causes their premature failure.
  3. The handle of an electric braid most often does not have a restrictive bar acting as a stop. Which does not exclude injury to the legs.
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It is these features that allow the use of exclusively plastic knives on trimmers with electric motors. In a collision with an obstacle, the blades are destroyed, thereby protecting the legs of the mower from possible injuries.

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

  1. The direct design of the bar increases the distance to the legs, which ensures complete safety.
  2. Convenient U-shaped and J-shaped handles allow to hold the tool firmly. D-shaped lawn mowing arms are equipped with a limiter resting on the leg of the pigtail, which does not allow the head to be allowed to reach when the cutting disc meets a solid obstacle.
  3. The clutch of the gasoline engine allows you to smoothly gain speed to the optimum level. And when the blade collides with a hard surface, it can absorb part of the impact.

Thus, gas trimmers with an installed metal knife are best used in large areas. They will successfully cope not only with tall coarse grass, weeds, burdocks and nettles, but also shrubs, as well as young trees.

The shape of the blade blades placed on the trimmer does not affect the quality of the work performed. Speed ​​does not depend on them either. Triangular, trapezoidal, rectangular shapes are all the marketing ploy of manufacturers.

How to put the knife on the trimmer

Putting a knife on the trimmer is not so difficult. The manufacturer supplies his 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 to observe when changing the cutting elements is the safety precautions and the assembly sequence of disassembly.

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

  1. Remove the protective cover;
  2. We block the drive. To do this, combine two holes. In the shaft hub and in the gear cup. After combining them, insert the pin into the holes;
  3. We turn off the spool with fishing line or the fastening nut holding the boot (clockwise, if the trimmer has not been used) clockwise from the hub;
  4. Next, install the cutting knife, so that the slots on the hub washer coincide with the recesses in the hole of the cutting disc;
  5. Install the boot;
  6. We twist the fastening nut (counterclockwise) while holding the locking pin;
  7. Tighten it using a pipe wrench;
  8. Return the protective cover to its place.

As you can see, there is nothing complicated. Now you can safely proceed to mow the weeds on the site.