Patent ID: 6092411
Filing Date: 2000-07-25
Classification: G01B

Abstract:
A shape measuring instrument, comprising:a measuring head for measuring a shape of a workpiece;a table on which the workpiece is placed, one of the measuring head and the table being rotated on an axis while a measuring direction of the measuring head is set perpendicular to the axis to thereby measure the shape of a section of the workpiece perpendicular to the axis;a reference gage placed on the table, the reference gage having first and second reference planes parallel to one another and perpendicular to the axis, a distance between the reference planes being already known as a reference distance;a terminal for receiving a reference value of the reference distance on the reference gage;a calculating part for calculating a measured value of the reference distance on the reference gage from measured data acquired by measuring the reference distance on the reference gage by the measuring head of which the measuring direction is set parallel to the axis; anda calibrating part for calibrating the measuring head so that the measured value accords with the reference value.