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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Comparison of the results of 4 users of a contemporary CADCAM system

McGarry, T. and McHugh, B.F. (2007) Comparison of the results of 4 users of a contemporary CADCAM system. Prosthetics and Orthotics International, 31 (1). pp. 27-35. ISSN 0309-3646

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Abstract

The objective of this study was to investigate the variation of measurements recorded when four different users of the Tracer CAD system trace a model of known dimensions and volume. This complements a previous study by the same authors Mc Garry and Mc Hugh, (2005) where the accuracy and consistency of a single user was measured. Landmarks were added to indicate proximal, distal, anterior, medial and lateral regions of a specially manufactured cylindrical nylon 6.6 model. Four circumferential lines were added at regular intervals along the length of the cylinder with a view to calculating diameters and volumes relative to these landmarks. The model was measured using a comparator with guaranteed accuracy to one hundredth of a millimetre, and was traced using the Tracer CAD system by four different users. The difference in mean volume between measured results and Tracer CAD scans of differing users ranged to -3%. Individual trace volumes varied by up to -7.85%. In all volumes measured, eleven out of twelve maximum volume percentage differences measured greater than 2 %, and of these, seven results showed maximum volume percentage difference to measure greater than 4%.