Maximum operating speed tables for A, B and W shapes are published in ANSI B7.1 Safety Guide for the Use, Care and Protection of Abrasive Wheels. Copies of ANSI B7.1 may be ordered from the Unified Abrasive Manufacturers’ Association, 30200 Detroit Road, Cleveland, Ohio 44145-1967.
Causes of Grinding Wheel Breakage
Here is a list of some of the causes of grinding wheel breakage.
Sandusky Chicago Abrasives Wheel supplies a Safety Guide with each box of mounted wheels. Operating mounted wheels higher than the maximum safe operating speed may result in failure of the mandrel.
Every mandrel - mounted wheel - overhang combination has a certain speed at which vibration due to deflection or whip becomes excessive. This speed varies with the dimensions of the wheel, diameter of the mandrel and the overhand, which is distance between the mounted wheel and the power tool chuck or collet.
The maximum speed is not measurably affected by the type or style of machine used. However, the condition of the machine spindle, bearings and chuck will affect the safe maximum speed. Also important are care in mounting the wheel as well as run-out and unbalance of the wheel.