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This part of ISO 28927 specifies a laboratory method for measuring handtransmitted vibration emission at the handles of handheld powerdriven angle and vertical grinders. It is a typetest procedure for establishing the magnitude of vibration in the gripping areas of a machine fitted with a specified test wheel and run under noload conditions. The method has been established for surface grinding tasks only. Cutting and sanding generally create lower vibrations. It is intended that the results be used to compare different models of the same type of machine This part of ISO 28927 is applicable to handheld machines (see Clause 5), driven pneumatically or by other means, intended for grinding, cuttingoff and rough sanding, with bonded, coated and superabrasive products for use on all kinds of materials. It is not applicable to grinders used with wire brushes, nor is it applicable to die or straight grinders. NOTE To avoid confusion with the terms “power tool” and “inserted tool”, machine is used for the former throughout this document