Bitten disc on the angle grinder, how to unscrew the nut
Angle grinder. An indispensable tool for various types of work. Even worse when the tool fails and the disc jams. In this case, it is not possible to remove the nozzle, because the nut is jammed. There is an easy way to twist the jammed fastener by means of heating, which we will tell you about in the article.
Malfunctions most often occur when working with strong materials. When starting, the angle grinder operates at 6,000 to 12,000 rpm. The disc in contact with the workpiece is exposed to strong resistance. It slows down slightly, while the motor continues to rotate in the same mode.
This leads to a rapid tightening of the retainer nut in the thread of the spindle. It is no longer possible to unscrew it with a conventional wrench.
Angle grinder. What it is, application, selection, safety precautions
Angle grinder, or angle grinder, or angle grinder is a hand-held power tool for cutting, grinding and other procedures for processing metal, stone and plastic. The device has a small cylindrical body, on one side of which is a device for installing accessories on the spindle, on the other side. A handle for holding the device during work. Inside there is an electric drive, powered from 220 V household network.
Angle grinder differ in size, power and corresponding scope of application into 3 main types:
- Large-sized. Dimensions 500 x 150 mm, power up to 3000 watts. Used for the production of. Can work uninterruptedly for long periods of time. They are characterized by a high service life.
- Medium. The dimensions of the body are 350×130 mm, the power is up to 1.5k. W. Used in professional work. The device can be operated for several hours daily.
- Small. Dimensions do not exceed 270 by 110 mm and the power is 1.2 kW. Designed for the home. Allow for limited periods of intermittent operation.
Most often used for domestic purposes small models of angle grinder power up to 1.2 kW Source.Ru
Sometimes those who are just starting to use an angle grinder reduce the basic rule of operation to the question of which way the nut is unscrewed to change the nozzle. In fact, this is only a technical side of the device maintenance. For its successful use, you need first of all to choose the right model for its purpose, convenience and power.
For example, the most comfortable operation will contribute to the correct selection of the device on such a number of parameters as:
- The number of handles, their location, the presence of anti-vibration pads.
- Motor power. The characteristic must match the work as well as the types of nozzles used. So, the smaller the disk, the higher its rotation speed. However, the use of a wheel that does not comply with the manufacturer’s recommendations, can lead to equipment damage and violations of safety rules.
- High quality. Both the device itself and the replacement accessories must be of the right quality. Since the work involves rotating mechanical parts, the destruction of which can lead to disastrous consequences.
Only high quality angle grinder and tooling allows you to quickly and safely cut workpieces Source 1metallocherepica.Ru
One of the main conditions for effective work with the angle grinder is the observance of safety requirements. Above all, these include:
Before you start working with the angle grinder, you need to prepare a place in accordance with the following set of requirements:
- Select an even and sufficiently large free area.
- For maximum reliability and safety of use of the angle grinder processed workpieces are fixed to the bolt connection by the required side, and if necessary, unscrew and reinstall in accordance with the work plan.
- If necessary, remove nearby objects that could be damaged by sparks, smoke and other operating factors.
- Remove all flammable elements. Solvents, fuel, rags, etc from the working area.
- When working at the construction site with construction material, prepare primary fire extinguishing means. Sand, fire extinguisher, water supply.
The angle grinder must be operated in dry weather outdoors and indoors with normal humidity.
There is a risk of personal injury when using an angle grinder in the home. Therefore, in order to protect themselves, the user should use the following protective equipment during work:
- Wear safety glasses or a face mask to prevent sparks or shards of material and disc.
- Use earplugs or building headphones to muffle sound.
- Protect your hands with gloves or mittens made of thick fabric. Their material must not be old, worn, with dangling threads, and the products themselves must be accurate in size.
- Use a respirator to prevent dust from entering the respiratory system.
- Wear thick leather shoes with metal toe pads to protect feet from flying sparks and falling objects.
In addition, the entire body must be securely covered with thick cloth overalls. Do not wear loose-fitting uniforms that could become caught up in the rotating parts of the machine.
For the successful operation of the angle grinder, each user must have an idea of which way to unscrew the disc and how to change it at all. However, in addition to this basic requirement, before starting work, the instrument should be checked for the following points:
- The power cord and plug must be encased in one piece, without kinks or other defects.
- The guard must be firmly fixed and mounted in a direction that prevents sparks from getting on clothing and in the face.
- Gear knob must be in one piece, without cracks and tightly screwed in.
- The blade should be mounted straight, without the slightest twist.
In addition, any user should know how to correctly apply the angle grinder, what direction of rotation of the disk in relation to the material to be processed to choose.
What side to put a disk on an angle grinder
In most cases, the abrasive for the angle grinder is installed only in one direction, but in the situation when working with stone or concrete the process changes. Therefore, it is necessary to consider these cases separately.
How to correctly place the wheel on the angle grinder. Two factors influence:
- On any abrasive glued a special label that shows the side on which it should be attached to the angle grinder. If the angle grinder is working away from the operator, as it should be in most cases, the disc must be mounted with the label facing inwards. When the angle grinder works in the opposite direction, the label is on the outside.
- Of course, you can put the abrasive on any side, not paying attention to the label. But in this case, unpredictable results, such as disc breakage, are to be expected.
Important! Experts assure that if you do not comply with the requirements of the disc installation, then the angle grinder one day will jam, the disc may break, injuring the operator working with the tool.
How to unscrew and properly place the disk on the angle grinder
This simple operation sometimes baffles even experienced locksmiths or users of angle grinder. The reason is that the disc is locked with a special nut. There are 2 or 4 holes on the nut, in which a special wrench is inserted. This wrench was 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, you need to press on the locking pin, which is located on the back side of the gearbox. When the shaft is locked in place, use a special wrench to unscrew the nut and change the disc. But it is difficult to unscrew the nut if it is not jammed. And clamping it with a nut like this is almost always. Attempting to unscrew the disk leads to breakage of the retainer behind the gear.
Which way out of the problem is suggested by specialists and amateurs
- Put a gasket of newspaper under the nut;
- Place a gasket from a plastic bottle under the nut;
- Replace the nut with a nut of a different design.
How to replace disc blade Ryobi Angle Grinder
What is a gasket made of newspaper.
This 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 paper was a stumbling block, because the safety inspectorate always said it was dangerous.
The representatives of safety engineering bodies treat the installation of shims of any other materials in the same way:
But there is a solution that 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. The use of such a nut does not require any pads, because with it the disk does not jam.
If there is no special wrench on hand, the craftsmen suggest to do without a wrench. It doesn’t mean you can do without a wrench at all, but use a “gas wrench” or other tool. To do this, clamp the retainer, clamp the nut with a gas wrench and unscrew it. It is possible to replace a jammed disk this way, but it is a very inconvenient operation for one person.
Some foreign power tool manufacturers, such as Bosh, produce angle grinders with easily removable nuts. They securely hold the disc on the tool shaft and are quickly and easily removed for disc replacement.
How to remove a jammed disc from an angle grinder
Using new nuts solves the problem of removing the disk, but what to do with an already bitten disk? Even if the disk has been mounted correctly, it is not always possible to remove it. Practice suggests different ways of solving the problem.
You can clamp the retainer and hit it through the nut holes through the superstructure in the direction of unscrewing. This is only possible if the ratchet is in good condition. But the retainer may not be able to withstand this solution and break.
The second method makes more sense. Under the clamping nut and the lower supporting washer there is a gearbox shaft with chamfered edges. The lower support washer is put on them. A standard wrench cannot be mounted there because it is too narrow. But it is possible to take an ordinary open-ended wrench size “17” and turn it on both sides.
The ground wrench will enter the gap, set on the chamfers of the shaft, and lock it in place. Now any wrench will unscrew any nut, and the disc or its remnants are 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 to process metal, others are made to process ceramics, and some work on wood.
The angle grinder must be fitted with a disk size that does not exceed the size of the safety guard. The size of the disc to be mounted is indicated in the manual and on the marking table of the angle grinder.
Disc thickness is selected according to 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 bump during work.
The grinding wheel has a front and a back side. The front side is considered to be that on which the manufacturer’s marking and branding are affixed. When installed on the angle grinder, the front side must face upwards.
That is why protective clothing or a thick apron must always be worn when working with the angle grinder. Eyes and exposed facial areas should be protected with a mask or at least goggles.
Modifications of clamping nuts
Some manufacturers have paid serious attention to the problem of a tightened clamping part on their angle grinders and eliminated it. For example, a DeWALT grinder has an improved mechanism and a clamping fixture that can be quickly and easily unscrewed even after prolonged use of the device. Both the manufacturers of angle grinders and the makers of clamping nuts are also in constant search of. The renowned German company AEG has perfected the clamping element.
As a result, when using the clamping detail of the company, you can forget about discomfort, fastening element turns away quickly and without much effort at any time. And now you do not have to think about how to release the jammed circle or what is left of it. It’s quite simple: AEG has integrated a special heavy-duty bearing in the clip nut that prevents the fastener from spinning out spontaneously and jamming the disc.
In addition to the company AEG, there are a number of commercial brands that produce and practice specialized fasteners. Such fasteners are divided into two types:
- Which under all circumstances must be unscrewed with a wrench, but now not so long and hard;
- Advanced, which, even if the wheel is jammed, will make it possible to unscrew them with the fingers.
Jammed nut. How to unscrew it?
To remove the disk on an angle grinder, if it is jammed, is not so easy, especially without damaging the cutting element or the tool. There are also a few other ways to do it.
Replacing the blade with an opposite rotation
This method has several advantages. You can do it without a wrench and with a broken spindle lock. Those who are new to the angle grinder mistakenly believe that it is almost impossible to unscrew the nut if the stopper is broken. But it is far from that. You don’t even need a wrench.
The idea is that the grinding wheel must be rotated in different directions. Wearing tight gloves, you need to hit the cutting edge of the wheel several times. That’s how you ensure alternating motion in different directions. As a rule, a couple of sharp blows are enough to easily unscrew the nut.
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Using an open-end wrench and a socket head
In this case you need to slightly modify the existing standard tools. A wrench for 17 and a socket head for 24 mm. The thickness of the spanner is ground to 4 mm. The head is milled 4 protrusions that fit into the holes of the nut retainer.
After preparation, the wrench is placed in the space under the disk, and the head is put on the flange of the angle grinder and turned in the opposite direction to the rotation of the wheel. It can then be easily removed and replaced with a new one.
This is one way to remove the disc from the angle grinder without a wrench. The fixing nut is heated with an industrial hair dryer or a gas torch. The flange can then be unscrewed much more easily. However, there is a risk of damaging the plastic parts of the angle grinder or the gearbox.
With a nail
A 100 mm nail is best for this purpose. It should be bent into a U-shape so that the ends fit freely into the holes of the clamping flange. Point and flat is removed. After inserting a nail into the holes, unscrew the locking device. If manual force is insufficient, add a nail or screwdriver in the form of a lever.
Using a gas wrench
The reason for using this tool is the increase in applied torque due to the increased shoulder. It’s much easier to loosen a jammed joint with a torque wrench
However, when removing the jamming tool, it is important to remember that if you apply too much force, there is a risk of damaging the spindle lock or the jam nut
Use the torch or drill in chisel mode
To unscrew the disc on the angle grinder without a wrench, you can use a drill or a rotary table, switching it first to jackhammer mode. As a working tool, a suitable auger is used, most often 6 millimeters. Position the drill against the edge of the hole in the clamping nut, block the movement of the spindle and move it backwards with a short activation. This method allows you to unscrew even very complicated nails.
Knocking out the nut
This method is similar to the previous one, but a suitable metal rod or chisel can be used. After clamping the spindle head, tap on the edges of the clamping holes in the direction of movement of the wheel. Slightly move the locking device from the dead point and you can unscrew it by hand. However, the method is not the most harmless for the tool. The mounting holes for a standard wrench are damaged.
Destroying the cutting wheel
You can unscrew the jammed nut by completely destroying the disk. If there is already damage, you can finish it off with your hands, but more often than not, you will not be able to do this. Better get a hacksaw or metal blade and saw. This will leave you with a center ring and hard-to-reach pieces. Once you have found a suitable plate and clamped it in a vice, grind residual abrasive into a metal ring. After that it can be easily unscrewed with a standard spanner.
The most radical way to unscrew a jammed clamping nut is to saw it. It is desirable to resort to it only in extreme cases. Of course, you can find a new one, but you have to spend your time and money. It is not uncommon to have spare clamping elements in the delivery set of the angle grinder.
Why is the clamping nut tightened?
Almost every foreman who has to periodically work with an angle grinder has experienced that the nut on the cutting disc begins to tighten. Before trying to unscrew it with a wrench, you need to figure out what is causing the retainer to start tightening.
During operation, the disk on the angle grinder can spin up to 12,000 rpm. In the process of contact with the iron or stone surface, he encounters quite a serious resistance. Because of it, the rotational speed begins to decrease many times. In this case, the rotor continues to rotate as before. It is because of this nut can be jammed so hard that it can not be unscrewed with a conventional wrench to unscrew the disk angle grinder.
Further information! If the nut will not give way, do not try to manually unscrew it. It is necessary to read the recommendations which will help to unscrew it without much effort.
How to remove a jammed disc from an angle grinder
Using new nuts solves the problem of removing the disc, but what to do with an already bent disc? It is not always possible to remove the disk even when it is mounted correctly. Practice suggests different ways of solving the problem. You can clamp the retainer and hit the nut holes through the superstructure in the unscrewing direction. This is only possible if the retainer is undamaged. But the retainer may not be able to withstand such a solution and break.
The second method is more logical. Under the jam nut and bottom support washer there is a gearbox shaft with chamfers. A lower support washer is put on them. A standard wrench cannot be used there because it is too narrow. But you can take an ordinary “17” open-ended wrench and grind it on both sides.
Sharpened wrench will enter the gap, set on the chamfers of the shaft and secure it. Now any wrench will unscrew any nut and remove the disk or its remnants from the angle grinder.
How To Remove Stuck NUT Of An Angle Grinder. Very Simple
Jammed nut. How to unscrew it?
Remove the disk on the angle grinder, if it bogged, it is not so simple, especially without damaging the cutting element or tool. There are also a few more ways to do this.
Replacing the disc with an opposite rotation
This method has several advantages. It can be done without a wrench and with a broken spindle lock. Those who are new to the angle grinder mistakenly believe that if the stopper is broken, it is almost impossible to unscrew the nut. But this is far from it. You don’t even need a spanner.
The point is that the abrasive wheel must be rotated in different directions. Wearing tight gloves, hit the cutting edge of the wheel several times. This is how you provide alternating movement in different directions. A couple of strokes is generally sufficient to undo the nut easily.
Using an open-end wrench and socket head
In this case you will have to slightly modify the existing standard tools. A wrench for 17 and a socket head for 24 mm. The thickness of the wrench is reduced to 4 mm. 4 protrusions are milled on the head that fit into the holes in the retaining nut.
After preparation the wrench is placed in the space under the disk and the head is put on the flange of the angle grinder and turned in the opposite direction to the rotation of the wheel. It can then be easily removed and replaced with a new one.
This is one way to remove the disc from the angle grinder without a wrench. The fixation nut is heated with an industrial hair dryer or a gas torch. The flange can then be unscrewed much more easily. However, there is a risk of damaging the plastic parts of the angle grinder or the gearbox.
Using a nail
A 100 mm nail is best suited for this purpose. It should be bent into a U-shape so that the ends fit freely into the holes of the clamping flange. Point and flat is removed. Insert a nail in the holes and unscrew the retainer. If the effort of your hands is insufficient, add a nail or screwdriver in the shape of a lever.
Using the gas wrench
The reason for using this tool is the increase in applied torque due to the increased shoulder. It is much easier to loosen a jammed connection with a nail wrench. However, when removing the jam, it is important to remember that by applying excessive force, there is a risk of damaging the spindle lock or the jam nut.
Use a rotary or a drill bit in chisel mode
Unscrew the disk on the angle grinder without a wrench can be used with a drill or a rotary tool, pre-set it in the chipping hammer mode. As a working tool is used a suitable auger, most often 6 millimeters. Place the drill against the edge of the hole in the clamping nut, block the movement of the spindle and move it backwards with a short torque. Even very complicated jams can be unscrewed in this way.
Tapping out the nut
This method is similar to the previous one, only a suitable metal rod or chisel can be used. After clamping the spindle head, tap on the edges of the clamping holes in the direction of the wheel. Slightly moving the jam nut from its dead center, you can unscrew it by hand. However, this method is not the most harmless for the tool, since the mounting holes for a standard spanner would be damaged.
Destruction of the cutting wheel
A jammed nut can be unscrewed by completely destroying the disc. If there is already damage, you can finish breaking up by hand, but most often it can not be done. It is better to take a hacksaw or metal blade and saw. This will leave you with a center ring and hard-to-reach pieces. Find a suitable plate, clamping it in a vise, grind the rest of the abrasive against it to the metal ring. After that it will be easily unscrewed with a standard wrench.
The most radical way to unscrew a jammed jam nut is to saw it. It should be used only in extreme cases. Of course you can find a new one, but it will cost you time and money. It is not uncommon to have replacement clamping elements included with an angle grinder.