图1所示的工件，根据加工工序安排的要求，在φ85外圆径向钻2一φ14．5＋孔。由于成品件上2-φ15＋孔的同轴度及对φ27＋孔的位置度要求不大于φ0．010mm，故对本工序要求2孔的同轴度小于φ0．05mm。根据加工批量，工件的形状特点和本工序的加工精度要求，我厂设计了如图2所示 Figure 1 shows the workpiece, according to the requirements of the processing schedule, φ85 outer diameter radial drill a φ14.5 + hole. Due to the coaxiality of the 2-φ15 + hole and the position of the φ27 + hole on the finished product, the requirement is not greater than φ0.010mm, so the concentricity of the two holes required for this process is less than φ0.05mm. According to the processing batch, the shape of the workpiece characteristics and processing requirements of this process, I designed the plant shown in Figure 2