Patent ID: 6269544
Filing Date: 2001-08-07
Classification: G01B

Abstract:
An apparatus for measuring three-dimensional volumetric errors in a multiaxis machine tool comprising:a ball bar having a predetermined length and provided with a displacement sensor therein, and having a movable contact member at an outside thereof with an outside end surface of the contact member being flat;a U-shaped bar having two opposite extension arms and integrated with one end of said ball bar, each of the extension arms having a hole at a predetermined position with an operating pin being fitted into the hole;a first ball provided at the other end of said ball bar and detachably set in a stationary magnetic socket assembly;a second ball positioned to have always a ball and flat contact with the flat end surface of the movable contact member of the sensor;a vertical post perpendicularly positioned relative to said U-shaped bar and integrated with said second ball at a lower end thereof;a sleeve fitted over said post; andtwo guide bars fixedly and longitudinally assembled with an external surface of said sleeve at opposite positions, each of said guide bars being provided with a slot at a lower portion thereof for movably receiving the operating pin.