Section R. 408.10113 - Inspection of abrasive wheelsRule 113.
(1) At time of unpacking, an abrasive wheel shall be inspected for damage.(2) Prior to mounting, a vitrified or silicate wheel more than 4 inches in diameter shall be given a ring test by being tapped by a nonmetallic tool such as a handle of a screwdriver for a light wheel or a wooden mallet for a heavy wheel. The ring test shall be conducted as follows: (a) Wheels must be dry and free from sawdust when applying the ring test, otherwise the sound will be deadened.(b) Tap wheels about 45 degrees each side of the vertical center line and about 1 or 2 inches from the periphery as indicated by the spots in the figures below.(c) Then rotate the wheel 45 degrees and repeat the test.(d) A sound and undamaged wheel will give a clear metallic tone. If cracked, there will be a dead sound and not a clear "ring." Click Here To View Image
Mich. Admin. Code R. 408.10113