Compensating gear transmission errors in positional control apparatus

摘要

A positional control apparatus for a machine tool includes a movable member, such as a slide 10, and a means such as a motor 18, for driving said member through a transmission 13, 15. Means 17 measures the movement of slide 10 and further means 20 measures the movement at the motor 18. The measurements are compared and the result used in a control unit to correct the position of the slide 10 by movement of the motor 18. IMAGE