Patent ID: 6079278
Filing Date: 2000-06-27
Classification: G01B

Abstract:
A method of measuring slackness of a ball spline joint, the joint comprising a first groove formed on a cylindrical outer circumference of a first member, a second groove formed axially on an inner circumference of a second member which is fitted on the outer circumference of the first member, and a ball arranged between the grooves, the method comprising:setting a first measurement point at a predetermined distance from a center of the first member on a radial line passing through the center of the first member and a center of the first spline groove;setting a second measurement point at another predetermined distance from the center of the first member on the radial line such that the first measurement point and the second measurement point are arranged on either side of the center of the first member;applying a predetermined relative rotational torque between the first member and the second member; andcomputing a slackness of the joint based on a displacement amount of the first measurement point and a displacement amount of the second measurement point under the predetermined relative rotational torque.