Author(s)

R.A.E. Aston, E.J. Davis & A. W. Duflll

Abstract

The calibration of co-ordinate measuring machines and touch trigger probes R.A.E. Aston, EJ. Davis & A.W. Duffill School of Manufacturing and Mechanical Engineering, University of Birmingham, UK Abstract The paper describes the verification of a co-ordinate measurement machine (CMM) with its associated touch trigger probe (TTP). The preferred measuring methods use involved techniques but meaningful results were achieved with standard gauges. The CMM was a DBA Mistral, fitted with a Renishaw TP2 TTP. The verification method employing standard hemispheres, 'short' and 'long' gauge blocks. The objective was to detect periodic variations and to compensate where necessary. Previous work had shown that TTPs have a significant effect on gauge block measurements. To demonstrate this the TP2's characteristics were deduced from forces and deflections at the stylus and verified by hemisphere measurements. This established the TP2's 3 lobe characteristics, which were used to predict the

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