| 摘要 |
PURPOSE:To take a measurement of concentricity and to measure automatically an internal and an external diameter without any modification of a machine tool by providing a means which detects the quantity of eccentricity from a reference center and a means which detects the phase of said detecting means to a holder concentric with the reference center. CONSTITUTION:The measuring element 12a of an electric micrometer 12 is brought into contact with the hole 9 of a material 1 to be worked and contact quantities in respective directions are measured by rotating the main spindle. At this time, the measurement direction, i.e. phase of the electric micrometer 12 is detected through proximity switches 18 and a dog 16 for the proximity switch. The switches 18 rotate together with the electric micrometer 12 and holder 11 and the dog 16 for the proximity switch dropps invariably in the gravitational direction in a stationary state, so the measurement direction of the electric microswitch is known by detecting which proximity switch the dog 16 operates on. |
