《Table 1 Seven invariance classes in the new GPS system》

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《Modeling of Geometric Variations Within Three-Dimensional Tolerance Zones》

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PT:point；SL:straight line；PL:plane；HX:helix；Rx，Ry，Rz:three independent rotations around axes x，y，z；Tx，Ty，Tz:three independent translation along these axes

The new generation GPS system also gives the concepts and complementary application of surface model，invariance class，Degree of Invariance（DOI），intrinsic and situation feature etc.，to take a massive leap forw ard for digital control function of geometrical feature from the definition，description，specification to the actual inspection evaluation process.In the new GPS system，the geometries of w orkpieces are divided into seven types of commonly used w hich are called seven invariance classes.Seven invariance classes and their DOIs are show n in Table 1.