A Method for Evaluating Dynamical Friction in Linear Ball Bearings

• Main Authors: Somsak Mitatha, Koichi Maru, Tao Jin, Yusaku Fujii, Preecha P. Yupapin
• Format: Article
• Language: English
• Published: MDPI AG 2010-11-01
• Series: Sensors
• Subjects: linear ball bearings; dynamic friction coefficient; inertial force; optical measurement
• Online Access: http://www.mdpi.com/1424-8220/10/11/10069/

A method is proposed for evaluating the dynamical friction of linear bearings, whose motion is not perfectly linear due to some play in its internal mechanism. In this method, the moving part of a linear bearing is made to move freely, and the force acting on the moving part is measured as the inertial force given by the product of its mass and the acceleration of its centre of gravity. To evaluate the acceleration of its centre of gravity, the acceleration of two different points on it is measured using a dual-axis optical interferometer.