R 408.10175 Wheel speeds.

Rule 175. (1) An abrasive wheel or its package shall show the maximum operating speed as revolutions per minute. The use of a package for this marking shall be limited to those shapes which make marking unfeasible. (2) Except as provided for in R 408.10177, an abrasive wheel shall be run at a speed which is not more than that prescribed in table 21 of R 408.10199, but not more than the rated speed on the wheel. The revolutions per minute may be increased as the wheel diameter decreases if the original surface feet per minute speed is not exceeded. Wheel speed shall be computed from the free-running speed of the machine spindle. (3) An employer shall purchase and use only an abrasive wheel which has been speed tested, as prescribed in table 22 of R 408.10199, by the manufacturer, with the following exceptions: (a) A wheel that is less than 6 inches in diameter. (b) A diamond or cubic boron nitride wheel that is bonded by metal or organic substances. (c) A segmental disc wheel and disc wheel. (d) A ball grinding wheel. (e) A regulating wheel for centerless grinders. (f) A mounted wheel. (g) A segment. (4) The operating speed and overhang of a mounted wheel shall be not more than that prescribed in tables 23 to 31 of R 408.10199 (See figure 23). SPECIAL SPEEDS