What Does The Key From The Grinder Look Like

How to choose a grinder: the most important functions of the tool, ratings and reviews What is angle grinder, why this tool is called a grinder. How to choose the best grinder for your home. User reviews.

LBM from the rating. Additional features

Additional features offered by the manufacturer will make working with the grinder convenient and safe:

Smooth engine start. A very useful function, the disc spins up to operating speed gently, without an explosive jerk at the start.
Automatic disk balancing. Reduces vibration of the instrument in the hands. Particularly helpful when using an unevenly worn disc.
Number of handles. For household grinders, as a rule, there are two threaded holes and one handle that can be rearranged. This is very convenient if you need to change your hand while working in order to get into a narrow place.
Rotation speed regulation. The electronic circuitry maintains a constant speed of rotation of the motor shaft, regardless of the load on the disc. The work goes faster, the motor and gearbox will last longer.
The presence of a dust protection system. An important function for concrete work, the gearbox and shaft are protected from the ingress of cement particles, increasing the service life of the tool.
Possibility of connecting a construction vacuum cleaner. Along with personal protective equipment, a respirator, goggles and gloves, it increases the comfort and safety of work. The workplace will remain clean.
Locking the start button. For long periods of operation such as grinding or polishing, the operator does not need to keep the button pressed in the working position.
Auto power off. If the light is turned off during operation, the machine will de-energize the tool so that it does not start itself when the power supply is restored.

What parameters are important when choosing a grinder Rating of popular LBM models

In grinders, the rotation speed of the working shaft varies from 2.5 to 12 thousand revolutions per minute. The working range is in the range from 3000 to 6000 rpm. As a rule, the manufacturer sets the optimum rotation speed for his machine depending on the motor power, and sets this parameter at the design stage.

High-end angle grinders are equipped with a working shaft speed regulator. This adjustment is especially relevant when changing discs frequently. For example, when a disc with a diameter of 230 mm rotates at a frequency of 10 thousand rpm, it will be very difficult to hold the tool in your hands.

Table: rating of popular LBM models. Scratch disk size

The diameter of the disc is the main indicator of the grinder’s ability to perform certain operations. The larger the size of the cutting wheel, the more powerful and faster the grinder should be. The diameter of the hole in the circle (landing size) is standard: 22.2 mm.

For angle grinders, five standard types of discs are produced, differing in size:

Disc with a diameter of 115 mm. Designed for cutting materials of small thickness, for processing (grinding, polishing) small surfaces. The maximum cutting depth is approx. 30 mm.
Disc with a diameter of 125 mm. One of the most popular sizes for household use. The cutting depth is about 40 mm. A wide variety of attachments and accessories are produced for this size.
Disc with a diameter of 150 mm. Most often it is used in installation work as an auxiliary tool. Common size for cutting metal and plastic pipes for plumbing and electrical work.
Disc with a diameter of 180 mm. Semi-professional size. Assumes non-stop operation. The cutting edge is 50 mm. It is widely used in repair and construction works.
Disc diameter 230 mm. Used in professional grinders up to 2.5 kW. For household needs, devices that are too bulky are practically not used.

What parameters are important when choosing a grinder

Additional features offered by the manufacturer will make working with the grinder convenient and safe:

Smooth engine start. A very useful function, the disc spins up to working speed gently, without an explosive jerk at the start.
Automatic disk balancing. Reduces vibration of the instrument in the hands. Particularly helpful when using an unevenly worn disc.
Number of handles. For household grinders, as a rule, there are two threaded holes and one handle that can be rearranged. This is very convenient if you need to change your hand while working in order to get into a narrow place.
Rotation speed regulation. The electronic circuitry maintains a constant speed of rotation of the motor shaft, regardless of the load on the disc. The work goes faster, the motor and gearbox will last longer.
The presence of a dust protection system. An important function for concrete work, the gearbox and shaft are protected from the ingress of cement particles, increasing the service life of the tool.
Possibility of connecting a construction vacuum cleaner. Along with personal protective equipment, a respirator, goggles and gloves, it increases the comfort and safety of work. The workplace will remain clean.
Locking the start button. For long periods of operation such as grinding or polishing, the operator does not need to keep the button pressed in the working position.
Auto power off. If the light is turned off during operation, the machine will de-energize the tool so that it does not start itself when the power supply is restored.

An angle grinder (angle grinder), consisting of a motor and an abrasive wheel, appeared in the USSR in the 1970s. The tool was supplied by the Republic of Bulgaria, therefore, the people called it Bulgarian. Modern angle grinders are used wherever it is required to process hard materials: leveling concrete and stone, cutting metal and asbestos cement, sanding wood and plastic. What are the parameters for choosing the right tool for work at home and in the country?

Table: rating of popular LBM models. Gallery: LBM from rating

Let’s dwell on cutting wheels in more detail

The question of which side to put the disc on the grinder has no correct answer. Abrasive wheels do not have a programmed direction of rotation, so it doesn’t matter how you set it. The direction of rotation (away from you or towards you) is determined by the position of the guard. The choice depends on the position of the tool convenient for the operator.

What Does The Key From The Grinder Look Like

In addition, the direction of the flow of sparks (or stone dust) depends on the position of the casing.

For mounting the disc on the shaft, a collapsible flange is included. The lower part is rigidly fixed with chamfers, the upper part is a regular self-tightening nut. It is she who determines in which direction the disc on the grinder should rotate. During operation, the threaded connection is tightened, preventing the nozzle from jumping off. Sometimes the kit includes washers to dampen lateral vibrations. They can be made independently from dense electric cardboard or paronite. To secure the flange, a special open-end wrench is supplied with the tool. The shaft is secured with a clamping button to create the required tightening torque.

Ignorance of a simple question: how to properly install the disk, for inexperienced users can lead to equipment damage or injury. First of all, when changing a disc, it is necessary to clean the shaft and the inner surface of the protective casing with a steel brush.

A layer of metal particles is riveted onto these elements (when cutting the material). Thickness can reach several millimeters, as a result of which the disc loses centering or wedges.

Large attachments don’t just overload the motor. For installation, the protective cover must be removed. If the grinder’s disc scatters, and the guard is not installed, the fragments can seriously injure the operator.

Another controversial issue is whether it is possible to put a wood disc on a grinder. If you hold the instrument with your hands, there is no definite answer. The circular can easily get stuck in the fibrous structure of the tree. A tool escaping from the hands will cause a lot of troubles, including fatal injuries.

What if you lost your open-end wrench?

Precisely, how to unscrew a disc on a grinder without a key? There are three ways:

Make a bracket from a rod of a suitable diameter (a nail will do). This device can be used to loosen the flange using hand force. If the tightening is too strong, insert the lever into the bracket.
Use the gas key. Grasping the outer radius of the threaded flange, it is enough to remove the nut, and then it will be unscrewed by hand.
Tap the thread with precise tangential strokes. To do this, you can take a core or punch, install it in the hole for an open-end wrench, and with light blows of a hammer, turn the flange.

All manipulations to change the attachment are carried out after disconnecting the power cord.

How to properly and safely remove (install) a disc from a grinder?

The main uses of angle grinders
Let’s dwell on cutting wheels in more detail
What if you lost your open-end wrench?
Removing the split disc

Angle grinder (popular name Bulgarian), the most common tool for home craftsmen after the electric drill.

Despite the ease of use, amateurs often have questions about the maintenance of the tool, especially in the event of emergency situations. As a rule, breakdowns occur due to improper use of the tool.

The main uses of angle grinders

Surface cleaning, peeling off old paint. It is carried out with a brush with steel rods or sandpaper petals. There are no difficulties in work, except that brushes with sandpaper require observing the direction of rotation.
Sanding with sandpaper. A concentric nozzle with Velcro is screwed onto the grinder, on which, in turn, the abrasive is attached. The direction of the screw mount and the rotation of the tool shaft are checked before use.
Grinding with abrasive wheels. These attachments must be handled with care as the abrasive can break under heavy load. The material cannot be cut with such discs, shock loads are unacceptable.
Cutting metals, stone, concrete slitting. Performed with cutting discs.

It is with such nozzles that abnormal situations most often occur.

Removing the split disc

There are times when the cut-off wheel is jammed during operation. Not only have you lost the nozzle, in such a situation the flange (its threaded part) is clamped with repeated force. How to remove a disc from a grinder in such a situation?

First of all, the tool must be securely fastened. Use clamps and a sturdy workbench. Then it is necessary to fix the shaft blocking key. If your hand is not strong enough, lengthen the open-end wrench handle: for example, with a piece of steel pipe.

Then we continue disassembling in the above ways: with a reinforced open-end or gas wrench. The disadvantage of this method can be to damage the shaft, it will remain jagged.

If the shaft is completely removed from the gearbox, the chamfers on the bottom of the flange can be locked using a conventional wrench. Then the risk of damage is minimal. For any method, it is recommended to use a penetrating lubricant: WD-40 or regular kerosene. Withstand a few minutes after application, you will significantly reduce the effort.

Outcome:
Any problem is easier to prevent than to deal with the consequences. By observing the rules of operation and the tool, you minimize the possibility of emergency situations.

Let’s dwell on cutting wheels in more detail

For mounting the disc on the shaft, a collapsible flange is included. The lower part is rigidly fixed with chamfers, the upper part is a regular self-tightening nut. It is she who determines in which direction the disc on the grinder should rotate. During operation, the threaded connection is tightened, preventing the nozzle from jumping off. Sometimes the kit includes washers to dampen lateral vibrations. They can be made independently from dense electric cardboard or paronite. To secure the flange, a special open-end wrench is supplied with the tool. The shaft is secured with a clamping button to create the required tightening torque.

A layer of metal particles is riveted onto these elements (when cutting the material). Thickness can reach several millimeters, as a result of which the disc loses centering or wedges.

Large attachments don’t just overload the motor. For installation, the protective cover must be removed. If the grinder‘s disc scatters, and the guard is not installed, the fragments can seriously injure the operator.

The main uses of angle grinders

Surface cleaning, peeling off old paint. It is carried out with a brush with steel rods or sandpaper petals. There are no difficulties in work, except that brushes with sandpaper require observing the direction of rotation.
Sanding with sandpaper. A concentric nozzle with Velcro is screwed onto the grinder, on which, in turn, the abrasive is attached. The direction of the screw mount and the rotation of the tool shaft are checked before use.
Grinding with abrasive wheels. These attachments must be handled with care as the abrasive can break under heavy load. The material cannot be cut with such discs, shock loads are unacceptable.
Cutting metals, stone, concrete slitting. Performed with cutting discs.

It is with such nozzles that abnormal situations most often occur.

How to properly and safely remove (install) a disc from a grinder?

The main uses of angle grinders
Let’s dwell on cutting wheels in more detail
What if you lost your open-end wrench?
Removing the split disc

Angle grinder (popular name Bulgarian), the most common tool for home craftsmen after the electric drill.

Despite the ease of use, amateurs often have questions about the maintenance of the tool, especially in the event of emergency situations. As a rule, breakdowns occur due to improper use of the tool.

What if you lost your open-end wrench?

Precisely, how to unscrew a disc on a grinder without a key? There are three ways:

Make a bracket from a rod of a suitable diameter (a nail will do). This device can be used to loosen the flange using hand force. If the tightening is too strong, insert the lever into the bracket.
Use the gas key. Grasping the outer radius of the threaded flange, it is enough to remove the nut, and then it will be unscrewed by hand.
Tap the thread with precise tangential strokes. To do this, you can take a core or punch, install it in the hole for an open-end wrench, and with light blows of a hammer, turn the flange.

All manipulations to change the attachment are carried out after disconnecting the power cord.

Removing the split disc

First of all, the tool must be securely fastened. Use clamps and a sturdy workbench. Then it is necessary to fix the shaft lock key. If your hand is not strong enough, lengthen the open-end wrench handle: for example, with a piece of steel pipe.

Then we continue disassembling in the above ways: with a reinforced open-end or gas wrench. The disadvantage of this method can be to damage the shaft, it will remain jagged.

Outcome:
Any problem is easier to prevent than to deal with the consequences. By observing the rules of operation and the tool, you minimize the possibility of emergency situations.

Tips for choosing a key for a grinder

Modern grinders (angle grinders) are equipped with a variety of attachments. The designers are trying to ensure the successful use of their developments for grinding, cutting and polishing dissimilar materials. But the nozzles are not changed manually, but with the use of special devices.

We will talk about the features of choosing keys for a grinder in our article.

Application features

It is often necessary to use a key for a grinder when removing and replacing a disc. And such a need arises mainly due to the appearance of cracks in the disk itself. Before using the key, it is necessary to stop the operation of the equipment and disconnect it from power. Failure to comply with this rule threatens with big trouble.

How to choose?

The key used during work must provide a quick and reliable clamping of the disk, therefore the tool is made of high strength steel, only under this condition it will work for a long time.

When choosing a key, it is recommended to pay attention to:

The presence of the soft start function (prevention of jerks during start-up);
The ability to block the brushes in case of voltage surges;
Option for automatic spindle balancing (reduction of runout during use);
The ability to hold the start button, this is a very useful function for long-term operation.

The main part of the key is made of tool steel. It is very good if the handle has a polymer coating. The universal device has a movable working part, the dimensions are adjusted very smoothly. Their range can vary over a fairly wide range.

And a few more recommendations for choosing.

It is undesirable to purchase a mechanism even with a slight backlash.
The diameter of the nuts (in millimeters) that the factory key can unscrew is indicated after the letters KP.
Before buying, it is worth checking the tool in your hand to see if it slips.

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