R 408.10174 Grinding machine spindle speeds.

Rule 174. (1) The spindle speed shall be permanently marked on a grinding machine and maintained in a legible manner. (2) The spindle speed shall not exceed the rated speed of the grinding wheel. (3) The wheel spindle speed on a single-speed grinding machine shall be checked with a tachometer when a change is made which could affect the spindle speed. (4) The wheel spindle speed on an air-driven grinder shall be checked with a tachometer as follows: (a) After maintenance or repair. (b) When in use, with such checks being performed as often as necessary to assure that wheel overspeed will not occur. (5) The wheel spindle speed of a vari-speed grinding machine shall be checked with a tachometer as follows: (a) When in use, with such checks being performed as often as necessary to assure that wheel overspeed shall not occur. (b) After any change that could affect the spindle speed. (c) When a new wheel is mounted.