车刀位置不正确,会直接影响加工工件锥面的变化。已经试测好的斜度,往往在精车时换上精作刀的时候,因刀尖低於或高於中心面而使工件锥度减小及几何形状发生变化,而成为废品。现在我们研究一下:如[图一],设工件最大半径为R,最小半径为r,锥形部份长度为L,则工件锥度 2tanα=2·(R-r)/L Tool position is not correct, will directly affect the processing of workpiece cone surface changes. Has been tested a good slope, often put fine in the fine car when the knife, because the tip below or above the center of the workpiece to reduce taper and geometry changes, and become a waste. Now we study: As shown in Figure 1, the maximum radius of the workpiece R, the minimum radius r, the length of the tapered portion L, the workpiece taper 2tanα = 2 · (R-r) / L