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In the context of product quality, the methods that can be used to estimatemachining defects and predict causes of these defects are one of the importantfactors of a manufacturing process. The two approaches that are presented inthis article are used to determine the machining defects. The first approachuses the Small Displacement Torsor (SDT) concept [BM] to determine displacementdispersions (translations and rotations) of machined surfaces. The second one,which takes into account form errors of machined surface (i.e. twist, comber,undulation), uses a geometrical model based on the modal shape's properties,namely the form parameterization method [FS1]. A case study is then carried outto analyze the machining defects of a batch of machined parts.

Identification of machining defects by Small Displacement Torsor and form parameterization method