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# So we obtain 3 expressions of positioning deviation

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Unformatted text preview: ⎭ Table 1; some elementary connection links torsors 3.1. First step: determining the positioning deviation of the workpiece in set-up Sj TSj,HkSj is the torsor modeling the deviations of the surfaces of the part-holder TP,Pi is the torsor modeling the deviations of the surfaces of the workpiece THkSj,Pi is the torsor modeling the link between the surfaces of the part-holder and the workpiece (table 1 and figure 3). Secondary set of positioning connection ld Ho rtPa er H Positioning Surface Hk modelised by TSj,HkSj P r r rk or W W W W e e e e iiiiec P Primary set of positioning connection Set-up Sj Figure 3; positioning connections workpiece/part-holder The goal is to determine TSj,P that is the torsor modeling the positioning deviation of the workpiece relative to the machine tool in set-up Sj. Each positioning surface HkSj of the part-holder connected to a surface Pi of the workpiece contributes to position it. All positioning connections contribute to a unique positioning deviation of the workpiece. So TSj,P com...
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