scope:

This International Standard specifies the maximum permissiblevalues of unbalances for bonded abrasive wheels with an outsidediameter D ? 125 mm and maximum operating speed vs ? 16 m/s, in theas-delivered condition. It also specifies the method for measuringthe unbalance and the practical method for testing whether agrinding wheel is acceptable or not. This International Standard isapplicable to bonded abrasive wheels in the as-delivered condition.This International Standard is not applicable to ? diamond, cubicboron nitride or natural stone grinding wheels, or ? centrelesscontrol wheels, lapping and disc wheels, ball wheels or glassgrinding wheels. NOTE 1 The values given refer to the grindingwheel itself, independent of any unbalance which may exist in thebalancing arbor or in the means of fastening it to this arbor.These various elements, together with the flanges or hub-flanges,are assumed to be balanced, homogeneous and free from geometricaldefects. NOTE 2 The effects of unbalance are basically ? additionalstresses on the arbor, the machine and its mounting, ? excessivewear of the bearings, ? vibration prejudicial to the quality ofmachining and increased internal stresses in the grinding wheel,and increased operator fatigue.