When processing the workpiece shown in Figure 1 (material QT500-7), our factory will position the bottom surface and the bottom hole after the four holes are machined, and then machine the two holes on the two sides. Φ19.5_0~(+0.21), the coaxiality and positional accuracy of the hole are not high. Originally using the rotary drill shown in Figure 2, it is not very good
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