Importance

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Abstract

A grinding apparatus with a grinding wheel on the output shaft of a fluid servomotor driven by fluid from a fluid source and controlled by a servo valve. The servomotor housing is mounted on a stage moveable toward a work to press the grinding wheel against the work. The output shaft extends through a cover. A rotational speed detector includes a rotating member disposed on the output shaft inside the cover and a rotation detecting member attached to the cover facing the rotating member. Differences between the detected rotational speed of the shaft and a target rotational speed are determined by a control device, and the stage is moved in response to signals from the control device, so grinding can be adapted to various conditions. To increase grinding efficiency of the grinding wheel, the target rotation speed is set at the maximum output speed range and the grinding wheel is pressed with increased force against the work, or to prevent wear of the grinding wheel, the target rotation speed is set at the high speed range and the grinding wheel is pressed with decreased force against the work.

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First Claim