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Centerless grinding machines are used to provide smooth finish in the Outside diameters of cylindrical jobs which are difficult to hold between centers. Unlike a Cylindrical Grinding Machine which hold the job between centers, a centerless grinding machine secure the workpiece between two rotary grinding wheels rotating at different speeds. One of the wheel, usually called as Cutting wheel rotates at a higher tangential speed and the other wheel, often called as Regulating wheel which is movable, will be positioned to apply lateral pressure to the workpiece. The speed difference between the two rotating grinding wheels determines the rate of material removal from the workpiece.
Centerless grinding is a more efficient process compared to centered grinding processes.
Centerless grinders are generally of three types, based on the method used to feed the workpiece.