A METHOD FOR ESTIMATION OF FORM DEVIATIONS OF FREE-FORM SURFACES

Malgorzata Poniatowska

Abstract

In the majority of cases coordinate measurements of free-form surfaces are carried out along a regular u„ev grid. The local geometric deviation, i.e. the distance of a particular measurement point from the CAD model of the nominal surface, is established for each point. The measurement aims at evaluating the form deviation and thus the greatest deviation of the actual surface from the CAD model. Obtaining data of a discrete character is inseparably connected with losing information on the surface properties. The present paper proposes an approach to estimating form deviation of free-form surface, consisting in using CAD model built on the observed geometric deviations and representing surface of form deviations.

Keywords

free-form surface, form deviation, CAD model

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