502 The Influence of Feed Drive System to the Circular Interpolation Contouring Error at Quadrant Changing Position in NC Machine Tools : Analysis of Exponential Type Lost Motion

Abstract

Exponential type lost motion is sometimes observed especially in large-size machine tools which use linear ball guide way or wiper seal. This paper theoretically analyzes the motion of the drive system which uses sliding guide way and is affected by the nonlinear spring characteristics of the wiper seal and calculates the radius error and motor torque during circular interpolation motion. Using test stand that has sliding guide way and simulated wiper seals, some motion tests are conducted. The measured radius error and motor torque indicate similar tendency with calculated results.