一些大直径回转体的装配孔,往往是带锥度的,而锥孔的加工比直孔的加工要困难得多。首先是锥孔的精确尺寸不易测量,特别是孔口处加了倒角;其次,即使能测量,小拖板的角度也未必能准确地调到这一角度,对于大零件,就不可能在加工锥孔的过程中,用轴来检测锥度情况（多数情况下轴在设备上不 The mounting holes for some large diameter rotors tend to be tapered, while taper holes are more difficult to machine than straight holes. First, the exact size of the tapered hole is not easy to measure, especially the chamfer at the orifice. Second, the angle of the small pallet may not be accurately adjusted to this angle even if it can be measured. For large parts, Taper hole machining process, the shaft to detect taper (in most cases the shaft is not on the device