MODELING AND ANALYSIS OF NONLINEAR GUIDEWAY FOR DOUBLE-BALL BAR (DBB)MEASUREMENT AND DIAGNOSIS

The purpose of this paper is to study nonlinear geometric errors in mu lti-axis machine tools. A general mathematical model for guideway syst ems that can be applied to high-precision machine tools such as CNC la thes is introduced. Using this model, most nonlinear error sources in the guideway systems can be diagnosed by measuring the contouring erro r using a double-ball bar (DBB). Diagnostic software has been develope d to identify system parameters based on the least-squares estimation method. Inputting two or three contouring errors pattern data into thi s software enables parameters to be identified quickly, based on the n onlinear model. (C) 1997 Published by Elsevier Science Ltd.