The 125 type motorcycle brake disc produced by our factory is made of aluminum alloy die-casting parts. There is a casting hole to be expanded, hinged to φ14H8, roughness R (?) 3.2, maintaining the size of 52 ± 0.3mm, see Figure 1. In the past, the standard twist drill was used to ream the hole. Due to the improper selection of the blade shape, it is difficult for the drill bit to find the center of the positive casting hole. Hole wall thickness after reaming
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