Centering and measuring head for measuring machines

摘要

A centering and measuring head for measuring machines, comprising a tubular body in which a piston is slidably mounted and subjected to the continuous action of biassing means, at least two centering contact pieces mounted to pivot on shafts provided in the body tangentially on an imaginary circle concentric with the axis of the piston, the movements of the said centering contact pieces being controlled by the said piston, and means for monitoring the displacements of the piston against the action of the biassing restraining element.