Double cone stylus, touch probe, and method of calibrating double cone stylus

摘要

A double cone stylus includes a shank and a double cone-shaped tip attached to the tip end of the shank, the double cone-shaped tip being a rotationally symmetric body obtained by rotating a triangle having a base extending along the shank around the shank as the symmetric rotation axis. The double cone stylus allows the shape of an inner wall surface of a measurement object with the inner wall surface retracted from an upper reference plane to be measured from above.

主权项

1. A method of calibrating a double cone stylus included in at least one of a coordinate measuring machine and a contour measuring machine including a touch probe having the double cone stylus attached to a tip end thereof, the method comprising, when dimensions of a stylus tip of the double cone stylus are calibrated:
disposing a master ball with a calibration value in the at least one of the coordinate measuring machine and the contour measuring machine; performing touch measurement on the master ball using the touch probe to acquire a center position and a radius of the master ball; computing a radius of the stylus tip in a horizontal direction; performing touch measurement to determine a position of an apex of the master ball using the touch probe to acquire a height of the apex of the master ball; and computing a radius of the stylus tip in a height direction.