Abstract: The sudden feed-in speed of workpiece at the measure place is studied in the exact manufacture of the contact measure system. The author argues that the error of dynamic measure does not occur, and that the surface of parts is not damaged when collided as long as this velocity is controlled properly to assure precision of manufacture. The critical formula of feed-in workpiece velocity at the measure place is put forward and applied effectively in determining this speed.

Key words: Contact measure, Feed-in velocity