How to correctly put a wheel on an angle grinder
How to correctly and safely remove (install) the disc from the angle grinder?
It is difficult to encounter such a problem when rotating at idle speed. Particularly when working with light wheels and tools with the soft start function. However, after increasing the RPM and contact with the surface to be cut, the following happens:
- When material resistance occurs, the wheel‘s angular velocity of rotation is drastically reduced, it brakes.
- The motor continues to run for a few moments at the previous speed due to inertia, dragging the gearbox and spindle along with it.
- The clamping nut is tightened more by the inertia on the thread of the spindle head and thus the cutting disc is pressed in.
That’s it, the tightening process of the retaining flange is complete. the abnormal situation is evident. The following factors influence its occurrence:
- Large wheel size.
- High tool power.
- Massiveness of the rotor.
- Rapid increase in cutting depth, i.e.е. increased resistance.
In this case it can be very difficult to remove the disc from the angle grinder. Additional measures have to be taken.
What causes the problem?
This problem is difficult to encounter when rotating at idle speed. Particularly when working with lightweight wheels and tools with soft start function. However, after increasing the RPM and coming into contact with the surface to be cut, the following happens:
- When material resistance is encountered, the wheel‘s angular velocity is drastically reduced, it slows down.
- The motor continues to run at the same speed for some moments by inertia, dragging the gearbox and spindle along with it.
- The retainer nut is tightened more by inertia on the threads of the spindle head, thereby pressing the cutting disc in.
The tightening of the locking flange is now complete. the abnormal situation is evident. Its occurrence is affected by the following factors:
- Large wheel size.
- High power of the tool.
- Massiveness of the rotor.
- Sharp increase in cutting depth, i.e.е. Increased resistance.
In this case, remove the disc from the angle grinder is very difficult. Additional measures have to be taken.
On the cutting-off wheels let’s talk in detail
There is no right answer to the question, what side to put the disc on the angle grinder. Abrasive discs do not have a programmed direction of rotation, so it does not matter how you set it. The direction of rotation (from yourself or on yourself), determined by the position of the guard. The choice depends on the operator’s comfort with the tool.
The position of the guard also influences the direction of the flow of sparks (or stone dust).
It is advisable to put the disk face (marked) upwards.
In this case, you will not forget which attachment is installed: on a stone or alloy. They are not interchangeable.
To mount the disc on the shaft, the kit includes a collapsible flange. Bottom part is aggressively chamfered and the top part is an ordinary self-tightening nut. This specifically describes the direction in which the disc on the angle grinder must rotate. During operation, the threaded connection tightens, preventing the nozzle from coming off.
From time to time the kit includes washers, designed to damp transverse vibrations.
They can be made without any help from thick electrical cardboard or paronite.
To fix the flange, the tool comes with a special wrench. The shaft is fixed with a clamping button to make the needed tightening torque.
Ignorance of a common question: how to properly install the drive, for inexperienced users can lead to equipment damage or injury. The first thing to do when changing the disc is to grind the shaft and the inner surface of the guard with a wire brush.
A layer of iron particles is riveted on these elements (when cutting ).
The thickness can be up to a couple of millimeters, and as a result the disk loses its alignment or gets jammed.
Important! It is strictly forbidden to install discs whose cross-section does not correspond to the specification of the angle grinder.
Large attachments do not simply overload the electric motor. The safety guard must be removed for installation. If the disc of the angle grinder breaks, but the protection is not installed, splinters can seriously injure the operator.
READ How to Properly Put a Disc on a Circular Saw
Another controversial question, whether it is possible to put on an angle grinder disk on wood. If you hold the tool with your hands, the specific answer is you can’t.
The circular grinder can simply jam in the fibrous structure of wood. A tool that gets out of your hands will cause a lot of trouble, including fatal injuries.
Tips that do not stand up to criticism
Some cutting-off wheels, for example those designed to work with stone or tile, have a special arrow. It indicates the direction of rotation. In such a case, to advise otherwise would be foolish, which makes perfect sense. As for metal cutting abrasives, as a rule, no arrows are put on them. This is where the “superprofessionals” get creative, handing out advice left and right.
The first logical chain of pseudo-professionals may be as follows. In the middle of the circle, on the side where the drawing is located, there is a metal washer fixed by rolling. That’s right, you can’t argue with that. But this is not the point. What follows is an explanation. “Look at the washer of the angle grinder where you put the disc, there are bumps on it. If you place the circle so that it is in contact with these irregularities with a metal washer, the defects are leveled. In the process of clamping roughness will press against the ring, thus ensuring the best and most reliable connection. When working, there will be no jamming of the abrasive, it will not rotate”.
The logical chain number 2 from the pseudo-specialists. “Small bumps form on the lap as it is cast. The clamping nut of the grinder on the thread has a backlash. It is at its expense during clamping that the irregularities are smoothed out.”.
Now for the most interesting part. According to the “experts”, if you look at the petal grinding disc, the inner metal ring is on the petal side. Accordingly, this part to the gearbox and set the abrasive on the grinder.
Carefully analyze the above advice and proceed to a complete rebuttal. Otherwise, more and more people will adopt false information, which will not only create problems in the work, but can also cause injury.
The main difference between the two sides of the wheel
On any disc for angle grinder, you can easily see the differences in the two sides of the wheel. One side is monotonous, it is covered with abrasive materials (to work with different types of metals). The front side has a special label, on which they write information about the characteristics of the cutter.
But the main difference between the two sides of the circle is the presence of a metal ring. This is an important design element that affects the safety of use, and therefore deserves a separate mention.
How to unscrew and properly place the disk on the angle grinder
This simple operation sometimes baffles even experienced locksmiths or angle grinder users. The reason is that the disc is fixed by a special nut. The nut has 2 or 4 holes into which a special wrench is inserted. This wrench is always included with the purchase of the angle grinder. It may still be included in the kits.
According to the instructions to the angle grinder is necessary to press the lock, which is located on the back side of the gearbox. When the shaft is fixed, it is necessary to unscrew the nut with a special wrench and change the disk. But it’s hard to unscrew the nut if it’s not jammed. And it’s almost always jammed with this nut. Attempting to unscrew the disk causes the retainer behind the gearbox to break.
What solution to the problem has been proposed by specialists and amateurs
- The gasket made of newspaper should be placed under the nut;
- Put a plastic bottle gasket under the nut;
- Replace the nut with a nut of a different design.
What is a gasket made of newspaper?
It is a paper washer to the size of the nut. It is put on the installed disc and the nut is screwed on top. This piece of paper was a stumbling block because the Safety Inspectorate always said that this solution was harmful.
The representatives of the safety authorities treat the installation of gaskets made of any other materials in the same way:
But there is a solution, which does not contradict the safety requirements and allows the normal installation and removal of the disk. This is a special nut that consists of two elements. a nut and a pressure washer. Using such a nut does not require any pads, because it does not jam the disc.
If you do not have a special wrench, skilled workers offer to do without it. This does not mean that you can do without a wrench at all, but use a “gas wrench” or other device. To do this, you need to clamp the retainer, clamp the nut with a gas wrench and unscrew it. It is possible to replace a jammed disc this way, but it is a very inconvenient operation for one person.
There are also suggestions to clamp the disk with your hand and unscrew it this way. Maybe, but this is hardly a way to change a broken disk. It is better to use wrenches that are designed for removing and installing discs.
Some foreign power tool manufacturers, such as Bosh, produce angle grinders with easily removable nuts. They securely hold the disc in place on the tool shaft and are quick and easy to remove for disc replacement.
How to remove a bogged disc from the angle grinder
Using new nuts solves the disc removal problem, but what to do with an already bent disc?? It is not always possible to remove the disc even if it has been installed correctly. Practice suggests different ways of solving the problem.
It is possible to clamp the locking device and to strike the nut holes through the superstructure in the direction of unscrewing. This is only possible if the retainer is undamaged. But the ratchet can not withstand such a solution and break.
The second method is more logical. Gear unit shaft with chamfers under the clamp nut and bottom support washer. The bottom support washer is put on them. A standard wrench can’t be installed there. it’s very narrow. But you can take an ordinary “17” open-end wrench and grind it on both sides.
A sharpened wrench will enter the gap and engage in the grooves of the shaft and lock it in place. Now with any wrench any nut will be unscrewed, and the disk or its remains removed from the angle grinder.
How to put the right disc on the angle grinder
Grinding discs have different diameters, thicknesses and applications. Some are made for metal processing, others for ceramic processing, and some work on wood.
On the angle grinder must be installed disc of such a size that will not exceed the size of the protective cover. The size of the blade to be mounted is indicated in the manual and on the marking table of the angle grinder.
Disc thickness is selected by the technological parameters of the processed material. All discs (grinding discs) have their own classification. Classified by disc shape, abrasiveness, grit, hardness, accuracy class and unbalance class. It is the latter value that is responsible for the fact that some discs start to beat while working.
The grinding wheel has a front and back side. The front side is the one on which the marking and the manufacturer’s branding are applied. When installing on an angle grinder, the face must be on top.
The disk is installed as follows. So that during work sparks with particles of the processed material flew in the direction of the worker. This is due to the issue of safety. If the angle grinder breaks free from the hands, it will not fly in the direction of the worker.
That is why you must wear protective clothing or a thick apron to work with the angle grinder. Protect eyes and exposed face with a mask or at least safety glasses.
The main question: How to choose the right disc for the angle grinder?
When choosing accessories for angle grinder, first of all, you should decide on the type of anticipated work. This will determine the choice of disc type. We also want to mention that when choosing a consumable, be sure to take into account the power characteristics of each specific model. Study the marking. Often, it is printed on the disc itself and includes a set of symbols by which you can determine the relevance of the consumable for the intended work.
Also, pay close attention to disc diameters. In any case it must not be larger than the size of the blade guard on the specific tool model. The size range of discs is usually represented by the following diameters: 115, 125, 150, 180 and 230 mm. The most common diameters are 125 mm. and 230 mm thick. They are optimal for most types of work and the capabilities of the tool itself.
As for the thickness of disks for metal, stone, it often ranges from 1 to 3.0 mm. cutting discs). According to many masters’ reviews it can be concluded that the thinner the disk, the more convenient it is to work with. This is certainly true, but do not forget that working with a disc with a small thickness increases its fragility and the risk of failure of the entire tool.
The most popular bakelite discs are 6.00 mm thick. This parameter depends on the total diameter of the disc. The dependence is as follows: the larger the disk diameter, the greater will be its thickness and vice versa.
What side to put the disk on the angle grinder?
Which way you put the cutting wheel may depend on several factors. First, if the disk is not flat, there is only one way to put it and the question disappears by itself. Secondly, if the disc is flat you can be guided by the label. if the angle grinder turns away from yourself it is placed with the label inside, if on itself it is placed outside. If this principle is not followed, you can expect undesirable results. disk breakage during sawing or just its rapid wear.
As for the direction in which the disk on the angle grinder rotates, then it is primarily a question of security. It is generally assumed that concrete should be cut in the direction of rotation of the disc or towards yourself. In an ideal position, the sparks should fly to the side to the left of the person working with the tool. If you can’t do it, you can use another position, when a shear of sparks is directed downwards. In any case, you can not allow a situation where sparks fly from the user, as in the case of a sharp jamming of the disc, the angle grinder will be directed in its direction.
In other words, it is extremely unsafe to cut materials against the direction of disc rotation or away from yourself, because in the case of a wedge, there is a sharp ejection of the angle grinder in the direction of the one who works. By the way, if you have additional questions about how to install the disk on the angle grinder, you can also view training videos, which today on the Internet more than enough.
If you still have questions or need advice on changing and installing discs just leave an application online or call us on the listed contact phone number and our specialists will tell you the right way to proceed. Our complete range of diamond discs can be found in the diamond discs section.
What to do if the angle grinder is jammed (jammed)?
Everyone, who has had intensive work experience with the angle grinder, must have faced such a situation at least once.
Usually, this happens if the disk is clamped between the parts, it stops or breaks, and the motor of the angle grinder continues to rotate and thus tightens the nut irrevocably.
So what can you do if the drive on the angle grinder is jammed?
Every craftsman has his own secrets.Especially for you we have learned a few of them, and now we will share the most common ways out of the situation.
Remove the disk from the angle grinder
First, figure out which way to unscrew the nut.
The flange must always be turned in the direction of the disc rotation.
For this kind of work you need either two gas wrenches or two clamps.
Here’s what to do: destroy the remains of the disk, with one wrench fix the washer behind the disk, with the other unscrew the flange.
remove the disk from the angle grinder
This method involves the use of the famous VD-40 grease.
It is probably like duct tape and is applicable in all cases.
You need to spray the flange, wait about 5 minutes and try to unscrew it with a wrench.
Remove the disk from the angle grinder
This method is used in extreme cases.
When all other methods do not help, you can try to saw the flange with a tool like a hacksaw for metal, and then buy a new one in a specialized store.