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This International Standard specifies the maximum permissible values of unbalances for various grinding wheels of ISO 603-1 to ISO 603-9 and ISO 603-12 to ISO 603-16 in the as-delivered condition, with an outside diameter D >115 mm and maximum operating speed v s W 16 m/s. It also specifies the method for measuring the unbalance and the practical method for testing whether a grinding wheel is acceptable or not. This International Standard is applicable to bonded abrasive grinding wheels in the as-delivered condition. This International Standard is not applicable to : - diamond, cubic boron nitride or natural stone grinding wheels, or to - centreless control wheels, lapping and disc wheels, ball wheels or glass grinding wheels. - additional stresses on the arbor, the machine and its mounting, - excessive wear of the bearings, - vibration prejudicial to the quality of machining and increased internal stresses in the grinding wheel, and - increased operator fatigue.