TY - JOUR N2 - Freeform surfaces have wider engineering applications. Designers use B-splines, Non-Uniform Rational B-splines, etc. to represent the freeform surfaces in CAD, while the manufacturers employ machines with controllers based on approximating functions or splines. Different errors also creep in during machining operations. Therefore the manufactured freeform surfaces have to be verified for conformance to design specification. Different points on the surface are probed using a coordinate measuring machine and substitute geometry of surface established from the measured points is compared with the design surface. The sampling points are distributed according to different strategies. In the present work, two new strategies of distributing the points on the basis of uniform surface area and dominant points are proposed, considering the geometrical nature of the surfaces. Metrological aspects such as probe contact and margins to be provided along the sides have also been included. The results are discussed in terms of deviation between measured points and substitute surface as well as between design and substitute surfaces, and compared with those obtained with the methods reported in the literature. L1 - http://journals.pan.pl/Content/89766/PDF/Journal10178-VolumeXVIII%20Issue2_04paper.pdf L2 - http://journals.pan.pl/Content/89766 PY - 2011 IS - No 2 EP - 222 DO - 10.2478/v10178-011-0004-y KW - freeform surface KW - coordinate measuring machine KW - machining errors KW - probe size KW - sampling strategies KW - substitute geometry A1 - Rajamohan, G. A1 - Shunmugam, M. A1 - Samuel, G. PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2011 T1 - Practical Measurement Strategies for Verification of Freeform Surfaces Using Coordinate Measuring Machines SP - 209 UR - http://journals.pan.pl/dlibra/publication/edition/89766 T2 - Metrology and Measurement Systems ER -