Surface roughness measuring unit and coordinate measuring apparatus

摘要

A surface roughness measuring unit (1) according to the present invention includes a contact pin unit (3) having a contact pin (12) and a displacement detector (16), the contact pin being provided so as to project and retract through a through-hole of a skid (11) and scanning and moving along a surface of a work piece, the displacement detector (16) detecting displacement of the contact pin in a direction perpendicular to the work piece surface; a driver (4) moving the contact pin unit (3) forward and backward along the surface of the work piece; and a joint coupling the contact pin unit and the driver to a measurement head holder of a coordinate measuring system. The surface roughness measuring unit further includes a contact detector that detects contact of the skid on the surface of the work piece.