Bore And Grind(搪磨), 此释义来源于网络辞典。
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It is difficult to grind bore on gear and secure its precision. Especially more linkage gear's precision can not be secured easily, so it maybe become a waste product because of serration error.
磨削加工多联齿轮内孔在工艺上有一定难度，磨孔后易使齿面误差超差造成废品。
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Two others will roam, grind and bore.
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