How To Install A Grinding Wheel On A Grinder

What are the types of grinder discs, their typical sizes.

How to correctly change the nozzle on the grinder. What to do if the disc is stuck and the nut won’t loosen?

Sharpening

To sharpen the tool, grinding machines (sharpeners) are usually used. But if you do not have the latter, but have a grinder, then you can purchase a sharpening (grinding) wheel for it, with which you can easily sharpen almost any cutting tool.

Heating nut

The nut can be heated with a gas torch, hot air gun or blowtorch. The heated flange can usually be unscrewed with a standard grinder wrench.

Typical disc sizes

When choosing a disc for a grinder, you must make sure that the outer diameter of the nozzle does not exceed the maximum allowable values ​​allowed for your angle grinder. For example, if a grinder is designed to use a circle with a maximum diameter of 125 mm, then a 230 mm circle cannot be installed on it. And there are several explanations for this:

  • The linear speed of the cutting edge will be exceeded, which is fraught with destruction of the abrasive wheel and injury to the user;
  • A small grinder does not have enough power to work with a large tool;
  • Installing a nozzle that exceeds the permissible dimensions requires removing the protective cover, and this is already a violation of safety rules.

Discs for angle grinders have standard sizes: 115, 125, 150, 180 and 230 mm. In modern grinders, the landing diameter (the diameter of the shaft on which the tool is installed) is practically the same and is equal to 22.2 mm. If you have an outdated grinder “lying around”, then you will need to use ring adapters of different diameters.

All abrasive wheels of any size have a special marking, from which you can find out the following information: the diameter of the disc and its thickness, the diameter of the seat, the maximum rotational speed, as well as what materials it is intended for processing.

With a gas wrench

This method is considered not entirely safe, since the stopper can be broken, although in most cases, it is possible to unscrew the nut. To avoid breaking the spindle lock, do not apply too much force to the gas wrench. The retainer is designed to withstand the force of a standard wrench.

An overly tightened flange can be unscrewed using 2 gas wrenches. To do this, break off the protruding ends of the abrasive wheel with pliers so that you can get the first gas wrench to the bottom flange. Next, tighten both flanges with wrenches and turn them in opposite directions (taking into account which thread on the spindle is right or left).

Selection and replacement of discs for grinders

An angle grinder (angle grinder), commonly called a “grinder”, is widely used at construction sites and in everyday life during repairs. It can be used to carry out many different technological processes. In order to choose the right tool for performing a certain type of work, you need to familiarize yourself with what kind of discs and nozzles for angle grinders are. The tool for this device is selected by its size and function.

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Roughing

If it is necessary to remove a layer of paint or other application, as well as rust from any surface, use a brush. They are disc-shaped or in the form of a bowl with built-in metal wire.

The wire in these attachments can be twisted or loose. Its thickness can also be different. The thicker the wire, the coarser the roughing disc or bowl is used, and vice versa.

How long does the grinding wheel last?

With intensive use, which essentially accompanies the performance of any operation, wear of the grinding wheel is inevitable. During operation, the grains grind down along the outer diameter of the circle, so it partially loses its abrasive and cutting properties. In this regard, they talk about such a characteristic as the consumption of grinding wheels.

The consumption rate of grinding wheels for a specific task is usually determined empirically, since it depends on several parameters:

  • Material. The harder the material, the faster the disc wears out. In particular, the consumption of grinding wheels per 1m2 for wood will be slightly lower than when working with stone or metal;
  • The presence or absence of the self-sharpening function. When worn up to a certain limit, the grains fall out from the edge, so the circle becomes sharper. In low-quality products, grains often fall out uncontrollably and until they are completely worn out. In this case, they say that the circle is crumbling.

Testing of grinding and cutting wheels features of the procedure

Since in the process of use the wheels are subjected to very intense loads, and also pose a significant danger in the event of rupture, the testing of grinding wheels is a mandatory final stage of their manufacture. This procedure is performed in two stages:

  1. Test of grinding wheels for mechanical strength, which involves tapping them on the end with a special wooden hammer. If there is any micro-damage, as evidenced by a rattling sound, the product is discarded and does not go on sale;
  2. Testing on a special test machine with a completely closed (for safety reasons) housing. Here the circle is checked at a speed slightly exceeding the maximum permissible values. The test time is determined based on the material of manufacture of the circle and is strictly regulated by existing standards.

At the end of the test, a marking is applied to the wheel containing the date of the test and the symbol of the person making the assessment.

Grinding wheel speed selection criteria

One of the leading characteristics, on the basis of which the choice of a specific wheel model is made, is the rotation speed of the grinding wheel. The speed value must be indicated when marking the product. It is important to take into account that, according to existing standards, there are 2 types of grinding:

  1. Speed up to 50 m / s as standard;
  2. Speed over 50 m / s high-speed option.

Grinding speed is usually determined based on two parameters:

  1. Capabilities of the tool, the maximum rotation speed for which is always indicated in the technical documentation;
  2. The nature of the operation being performed.

For a circle, the speed is determined, first of all, based on the material of its manufacture, as well as strength. Exceeding the values ​​indicated on the marking is not allowed, since in this case the risk of the wheel cracking and splitting from excessive loads during use increases greatly.

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When designating speed, traditionally, it is not the speed of rotation that is indicated, but the so-called peripheral speed. The factor that determines its value, besides rotation, is also the diameter of the circle. As the circle is grinded, its diameter decreases, which means that the efficiency of the work may decrease. In this case, an increase in the rotational speed is allowed in proportion to the grinding. However, the final value must still not exceed the maximum peripheral speed indicated on the label.

Grinding wheels purpose

The answer to the question What is a grinding wheel for? Suggests a large number of options. The main operations for which the use of grinding wheels is provided are:

  • Grinding;
  • Surface cleaning;
  • Cutting off;
  • Ripping.

During the operation of the grinding wheels, other tasks related to cleaning and grinding the surface can be performed. In most cases, the use of this tool is necessary not only from an aesthetic point of view, but is also prescribed by the technological process to give the surface the necessary properties.

Grinding wheels: application, characteristics, assembly and installation

The use of grinding wheels is a process that requires taking into account the mass of subtleties. The choice can also be difficult, since the number of product types is very significant, and the production of grinding wheels has a vast geography.

Attaching the grinding wheel to the machine features

Depending on the specific machine model, the installation of the grinding wheel can be done in several ways. The most commonly used are the following:

  1. On the spindle;
  2. On the screw;
  3. Gluing.

How to use a grinder grinding wheel?

Sanding discs can be used on two tools:

  1. Machine;
  2. Bulgarian.

The grinding wheel is mounted on the latter on the spindle. The main advantage is the easy replacement of disks, which can be selected and installed for different tasks.

How long does the grinding wheel last?

With intensive use, which essentially accompanies the performance of any operation, wear of the grinding wheel is inevitable. During operation, the grains grind down along the outer diameter of the circle, so it partially loses its abrasive and cutting properties. In this regard, they talk about such a characteristic as the consumption of grinding wheels.

The consumption rate of grinding wheels for a specific task is usually determined empirically, as it depends on several parameters:

  • Material. The harder the material, the faster the disc wears out. In particular, the consumption of grinding wheels per 1m2 for wood will be slightly lower than when working with stone or metal;
  • The presence or absence of the self-sharpening function. When worn up to a certain limit, the grains fall out from the edge, so the circle becomes sharper. In low-quality products, grains often fall out uncontrollably and until they are completely worn out. In this case, they say that the circle is crumbling.

Grinding wheel speed selection criteria

How To Install A Grinding Wheel On A Grinder

One of the leading characteristics, on the basis of which the choice of a specific wheel model is made, is the rotation speed of the grinding wheel. The speed value must be indicated when marking the product. It is important to take into account that, according to existing standards, there are 2 types of grinding:

  1. Speed up to 50 m / s as standard;
  2. Speed over 50 m / s high-speed option.
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Grinding speed is usually determined based on two parameters:

  1. Capabilities of the tool, the maximum rotation speed for which is always indicated in the technical documentation;
  2. The nature of the operation being performed.

For a circle, the speed is determined, first of all, based on the material of its manufacture, as well as strength. Exceeding the values ​​indicated on the marking is not allowed, since in this case the risk of the wheel cracking and splitting from excessive loads during use increases greatly.

When designating speed, traditionally, it is not the speed of rotation that is indicated, but the so-called peripheral speed. The factor that determines its value, besides rotation, is also the diameter of the circle. As the circle is grinded, its diameter decreases, which means that the efficiency of the work may decrease. In this case, an increase in the rotational speed is allowed in proportion to the grinding. However, the final value must still not exceed the maximum peripheral speed indicated on the label.

How to install a grinding wheel on a grinder?

A spacer is placed in front of the circle, the same is used on the other side. This allows for longer tool life. It is especially worth considering how to fasten the grinding wheel, since its service life depends on the correct fastening.

When installing a grinding wheel on a grinder, it is important that the fasteners are tightened sufficiently, otherwise the wheel will quickly come off during use. The other extreme is also unacceptable, the circle must rotate freely. If the fasteners are overtightened and because of this a tight move is observed, the grinding wheel will crack very quickly and become unusable.

Attaching the grinding wheel to the machine features

Depending on the specific machine model, the installation of the grinding wheel can be done in several ways. The most commonly used are the following:

  1. On the spindle;
  2. On the screw;
  3. Gluing.

Grinding wheel diameter how to choose the right one?

When choosing the size of the grinding wheel, two parameters must be considered, in particular:

  1. The outer diameter of a circle, measured from one edge to the other. For a given size, the circle is chosen based on the tasks set, that is, the size of the workpiece. It is always advisable to choose the maximum possible option, since the peripheral speed of the grinding wheel in this case will be higher, which means that the productivity will also increase.
  2. The inner diameter of the grinding wheels, that is, the size of the bore at which the wheel is attached to the spindle. The rim diameter of the grinding wheels must necessarily match the one declared by the manufacturer of a particular grinder or machine. If it is less, boring will be required, if more, the spindle is wrapped with a special tape until the parameters match. However, any of these actions will negatively affect the quality of the fastening.

When choosing a grinding wheel for grinding machines, diameters play a special role in internal grinding. In this case, the size of the circle is usually 0.7 to 0.9 times the size of the hole. You should not exceed these parameters, since the grinding procedure will be inconvenient, and with a smaller diameter of the wheel, the speed of its implementation will greatly decrease.