In this paper,by using the conceptions of the normal equidistant line and the cen-tripetal equidistant line of a plane curve and their equations which were presented inReferences [1] and [2] respectively,the authors simplify the research on the cam forcamber-grinding the stator of a paddle pump which was discussed in Reference [3],and makes it more precise.In addition,they also introduce a correspondingmathematical model of the precision dressing mechanism of die sets.
