Nut jammed on angle grinder. Measures to avoid jamming

What are the various ways to loosen a tightened nut on an angle grinder?

When rotating at idle speed, it is difficult to encounter such a problem. Particularly when working with lightweight and soft-start grinding discs. However, after increasing the speed and contact with the surface to be cut, the following happens:

jammed, angle, grinder, measures
  • In the event of material resistance, the wheel’s rotational angular velocity is drastically reduced and the wheel is braked.
  • The engine by inertia continues to work for a few moments at the same speed, dragging the gearbox and spindle behind it.
  • The clamping nut is tightened more by inertia on the threads of the spindle head, thereby pressing the cutting disc in.

That’s it, the tightening process of the fixing flange is over. the abnormal situation is evident. The following factors influence its occurrence:

  • Large circle size.
  • High tool capacity.
  • Massive rotor.
  • Sharp increase in cutting depth, t.е. increase in resistance.

In this case it can be very difficult to remove the disc from the angle grinder. Extra measures have to be taken.

Open-end wrench and socket head

A wrench n:17 and a socket head n:24 can be used to loosen a tightened retainer with an angle grinder. However, they have to be refined before such non-standard use. The wrench must be ground to a thickness of 4 mm and protrusions must be made on the head for the holes in the angle grinder’s retainer.

Dismantling takes place as follows. The wrench is inserted under the abrasive, and the socket head is put on the flange. Next, the two tools must be turned in the opposite direction of each other. The nut should be able to be unscrewed without any effort.

These tools often replace a special tool, or are used as a supplement. It is many times easier to loosen the clamping of the abrasive disk with these tools than with the standard version.

A nail to go with it

Another effective way to unscrew a jammed nut on an angle grinder if you have no key. This requires a 100 mm long nail, from which you need to bite off the head, and then give it a U-shape. The distance between the nail ends must match the holes in the clamping flange of the angle grinder. Insert the resulting construction into the nut holes and turn it. If the flange does not yield, you can use a screwdriver as a lever or a pair of pliers.

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How to install it correctly?

Placing the disk on the grinding machine is not a big deal. You can change it by simply following the instructions, although there are nuances.

You must always insert the blade in the correct direction first of all. It is especially important if it is a cut-off blade. Usually, the side of the disc with the label with the marking and, consequently, its application, is slightly different from the opposite side. It may not be revealed immediately, but with prolonged intensive work the difference will not only be noticeable. it will be obvious.

There is a wide washer on the side that is marked with a label and a sliding nut that is pressed down on it when the disk is being driven in. On the polished surface of the washer the nut slides, without it it will be more difficult to tighten or unscrew, because the abrasive will firmly hold the nut and more force will be required. This is especially important if you have to change the disc quickly or if it should break (jam).

There is always a chance that the disc will break, but installed properly, it breaks only under heavy loads, the structure of discs takes into account the difference of loads on both sides.

With circular saws or other products that have teeth or a significant difference of two sides, the problem of how to mount, usually does not arise. For example, to fix a grinding disc in reverse will not work: they simply can not work.

Disks for stone, including diamond, have a special rotation indicator in the form of an arrow: when installing them, it is necessary to mount, taking into account where the rod will rotate.

When installing it is also important to consider the size of the disk. Under no circumstances should you neglect safety and remove the protective cover. it is better to pick up the disc of appropriate diameter. Sometimes a disc from a large machine is used for a “angle grinder” of smaller dimensions. But as a rule, the worked disc is worse in cutting, the working surface is limited by about half of the disc radius, the structure is a little different. disc “burns up” faster and does less work. This operation can be justified if the diameter of the rod is the same. But it is not possible to change it back.

Before installing the disc “angle grinder” should be unplugged. this is a basic safety requirement, because the sudden inclusion at this time, fraught with the risk of serious injury.

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The clamping nut should be unscrewed with the spanner provided with the tool. To prevent the plunger from turning, it is necessary to block it by pressing the special button. Unscrew the nut while pressing the button.

After twisting the nut, the disc is put on the freed rod, facing outward, and it must be ensured that it is positioned exactly in the seating.

A new “angle grinder” always comes with a number of cardboard pads. when installing the disc, they must be placed so that they are between the disc and the clamping elements. These spacers will help unscrew a broken or jammed disc.

Next, the nut should be screwed in by hand as far as it will go and tightened with the special wrench. That’s it, the “angle grinder” is ready to work.

Disc breakage

The abrasive compressed by the nut can eventually be broken. This will require:

First of all, the disc, clamped in the angle grinder, is broken by hand. Then, using needle-nose pliers or pliers, break off the remnants of the abrasive sticking out from under the retainer. Next, remove the clamped part of the disc. To do this, a piece of metal is squeezed in a vise. The included tool is run along the edge of the sheet between the nut. This removes the remnants of the disk, and after the clamp should easily unscrew by hand.

As you can see, in order to unscrew an unyielding retainer nut from an angle grinder, there are many effective ways. When dismounting, it’s just important to be careful not to damage the power tool.

How to unscrew the disc nut of an angle grinder (angle grinder) if it is jammed

So, if you can’t use a spanner, even if you hit it with a hammer lightly, you should use something more serious.

The first thing you can try, but again, without fanaticism, is to take a stick, insert it into the holes in the nut and use a hammer to move the nut in the direction of unscrewing. The main thing here is not to break the button and not to tear the holes, like here

The second thing many people advise is to heat the nut. Warm up the nut. In the end it does have to expand a little, but physically. Resizing may or may not help

Do not pull to the extreme until the anti-rotation button stopper or the button itself bursts. In this case, it is not the tool you unscrew that breaks, but often it is the body of the angle grinder.

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The third way is the most effective, and oddly enough one of the safest for the most angle grinder. Break off the edges of the disc at the nut.

Then we use a thin metal plate or another disk (thinner), and maybe a second angle grinder with a disk. In this case, a broken disc must be chiseled out with either a plate or a disc. We sharpen the disk so as not to damage the nuts that hold the disk, after all we will need them. We sharpen the whole broken disk, until it is ground down and the nut is unscrewed.

If you will use a second disk or metal plate, it is better to put them in a vice to hold them. Since it is dangerous to hold such things with your hands. This method is the most effective!

What causes the problem??

It is difficult to encounter such a problem when rotating at idle speed. Especially when working with light circles and a tool with a soft start function. But after increasing the speed and coming into contact with the surface to be cut, the following happens:

  • If material resistance is encountered, the grinding wheel’s rotational angular velocity is severely reduced and the wheel is braked.
  • The motor continues to run at the same speed for a few moments due to 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 process of the locking flange is now complete. an abnormal situation has occurred. The following factors influence its occurrence:

  • Large circle size.
  • High tool power.
  • Massive rotor.
  • A sudden increase in cutting depth, t.е. Increase in resistance.

In this case, it can be very difficult to remove the disk from the angle grinder. Additional measures have to be taken.

How to avoid jamming?

To avoid the unpleasantness of changing the angle grinder head, it is advisable to prepare in advance. To do this, a small gasket can be inserted between the disc and the nut. You can use cardboard, linoleum or plastic as substitute material.

Always tighten too much, preferably with a smaller-diameter wheel. It is also important to keep the tool clean, timely treat the threads with oil, WD-40.

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