Cox, M G; Cross, N R; Flack, D R; Forbes, A B; Peggs, G N (1997) Measurement of artefacts using repositioning methods. NPL Report. CLM 2

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Abstract

This report describes a methodology for the measurement of large or complex artefacts by co-ordinate measuring machines (CMMs) using repositioning. The approach is applicable to measurement tasks where it is not possible or practical to measure all relevant parts of the workpiece surfaces without repositioning the artefact. By tracking the position of three or more registration points defmed by reference features (sphere centres, for example) that move rigidly with the workpiece it is possible to relate measurements taken in different positions to one frame of reference. Practical aspects of implementing the methodology are discussed and the results of measurement experiments presented. The method provides an effective way of extending significantly the measuring capability of a CMM.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CLM 2
Subjects:	Engineering Measurements Engineering Measurements > Dimensional
Last Modified:	02 Feb 2018 13:18
URI:	http://eprintspublications.npl.co.uk/id/eprint/808

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