The Calibration Of Co-ordinate Measuring Machines
And Touch Trigger Probes
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
Keywords
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