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Abstract:A method calculating the geometric rotation accuracy of a precision spindle is proposed. Both the spindle structure and the manufacturing errors of component parts are involved. Firstly, a directed graph of the spindle is built according to the relation among the parts. Error accumulating path and key tolerances are selected based on the graph. Then, key tolerances are modeled with small displacement torsors and the variation propagation within 4 kinds of typical assembly relationdoi:10.3901/jme.2017.03.173 fatcat:bgj23ymynfg4vbmwwl53exqwtq