I have a new Black and Decker "Firestarter" 4" angle grinder. I accidentally put the grinding disk on upside down (the protruding part facing toward the machine), and now I can't get it off. I've tried putting the wrench that came with it inside a piece of metal tubing, and turning. This only bent the tool. Any suggestions on how to remove the disk?
And then there are those "lefty-tighty" ones to throw you even more off track. One or both of these seems like the problem (loosening wrong direction - may be aggravated by the direction being counter-intuitive)
On the larger grinders, it is better to keep a copper washer on the spindle to keep those 5/8_11 threads from bonding to the disks. The little ones don't seem to have as much torque, so I have not been using a washer.
I have seen fellas break the pin and/or the casting on the big ones trying to get a wheel off.
Is your problem disk the kind with its own threaded hub or the one where you trap the disk between 2 hard steel "washers"? Can you get to the hex or 2-hole "nut"?
I have been able to get some things like this loose by striking firmly with a hammer. If you try this method, you will not be able to reuse the disc. If you use this method, do not hammer against the detent pin, you will probably break it. Just try to get a few very firm and swift cracks at it to jar it loose. It probably got into this situation by spinning tight under power, and will require a substantial counter blow.
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I don't know the exact tool you have, but something that I've done that works on occasion for certain items is to wrap a fan belt around the item, clamp the belt in a vise, and voila, a perfect strap wrench you can put some real leverage on. Of course, it helps to have a helper holding the main part in place.
Certain Metabo grinders (with the yellow spindle lock button) do not require a wrench to change the wheel. You simple allow the wheel to spin down until it almost stops and then press the spindle lock. This loosens the nut which you can remove by hand once everything has stopped.