Abstract
ABSTRACTIn this work axisymmetric components are scanned using Coordinate Measuring Machine (CMM) and modeled using circular section/boundary curves. Surface options such as Surfaces of revolution, lofted surface and coons surface are considered in modelling. The curve length and volume are numerically evaluated for various surface options. The error percentage is obtained for curve length and volume by taking the values measured from the components as reference values. Result are presented for six different circumferential curves shapes viz., parallel (cylindrical), inclined upwards (inverted frustum), inclined downwards (frustum), convex (barrel), concave (sand-clock shape) and combined convex-concave shape. The results show that percentage error is negligible only for Surfaces of revolution and lofted surface in modelling convex, concave and combined convex-concave shapes. In modelling parallel and inclined shapes all three surface options fit well. In modelling convex, concave and combined convex-concave shapes, coons surface does not fit well. The suggestion to designers is to use surfaces of revolution and lofted surface rather than using coons surface. Otherwise the shapes of components will be different from the designed shape. Also the volume of components will be different from the designed volume. In such cases the designed components fail to meet the shape and volume requirements.
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