Abstract
The friction of linear guideways has influence on the motion accuracy in machine tool drives. This paper presents the measurement and analysis of ball rolling friction. Friction forces are measured using a simple linear guidway where numbers of balls are limited to eight. From the measurement data, it was found that slip friction and stick friction depend on the ball size of the gudeway. By fitting the measured stick and slip friction data with a locomotive bristle model, dynamic parameters of the contact surface are identified. The slip velocity was assumed from Ito's theory, where the moment of a rolling ball is balanced. The friction forces, which is simulated from the identified parameter and the assumed slip velocity, differs from the measured friction forces. The variable slip velocity could match the simulated frictions to the measured frictions, which implies that more slip may exist in the contact surface than it is expected from Ito's theory.
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