Abstract: In the gringding of crankshaft using tangential point tracing grinding ,many factors, such as the cognate error between rotary axis (c axis) and to-and-fro axis (x axis)of grinding wheel, the elastic displacement of crankshaft along the normal of the gringing point under the grinding force, the variation of diameters of grind wheel,the deviation of the height between the center of grinding wheel and the rotary center of crankshaft, the variation of moment of gringding force to the rotary center of crankshaft along with the rotation of crankshaft, all lead to roundness error and size error of crankshaft. By means of digi-tal simulation and experimental research, the magnitude and change rules of machining error resulted by the factors men-tioned above are discussed. The error compensation model are given.

Key words: Tangential point tracing grinding, Crankshaft, Digital simulation, Error analysis, Experimental research