Related topic: when you install a grinder wheel, ya gotta do a ring test by tapping it gently to make sure it is not busticated.
A good solid ring, it's prolly OK ot use. A dull thud, it might be cracked and MUST be removed and inspected prior to hitting the go button. If you pass go and collect $200 and have a cracked wheel you might end up wearing part of the wheel to the hospital or coroner's office. It's happened before and is an OSHA reg, I sheet you not. CFR 1910.215(d)
Quote:
Mounting -
1910.215(d)(1)
Inspection.
Immediately before mounting, all wheels shall be closely inspected and sounded by the user (ring test) to make sure they have not been damaged in transit, storage, or otherwise. The spindle speed of the machine shall be checked before mounting of the wheel to be certain that it does not exceed the maximum operating speed marked on the wheel. Wheels should be tapped gently with a light nonmetallic implement, such as the handle of a screwdriver for light wheels, or a wooden mallet for heavier wheels. If they sound cracked (dead), they shall not be used. This is known as the "Ring Test".
1910.215(d)(1)(i)
Wheels must be dry and free from sawdust when applying the ring test, otherwise the sound will be deadened. It should also be noted that organic bonded wheels do not emit the same clear metallic ring as do vitrified and silicate wheels.
1910.215(d)(1)(ii)
"Tap" wheels about 45 deg. each side of the vertical centerline and about 1 or 2 inches from the periphery as indicated by the spots in Figure O-25 and Figure O-26. Then rotate the wheel 45 deg. and repeat the test. A sound and undamaged wheel will give a clear metallic tone. If cracked, there will be a dead sound and not a clear "ring."
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It's amazing how much stuff can get stuck in a person's head in a 38 year career.
They say all OSHA regs are written in blood. IOW just about every OSHA law was written as a result of someone getting kilt.