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分度头指数板上的分度孔(3A_3),小而多,要求光洁度_3,并且还要求每个圆周上孔的积累误差在±1°,所以加工起来很困难。原来在钻孔后用铰刀铰孔;但在铰孔的时候,切屑不容易流出,把铰刀刃口挤坏;孔的光洁度不够好;加工一块要5小时,要消耗刀具4～5根。根据经验,用钻头钻孔光洁度可以达到_4,但精度达不到A_3级的公差要求。于是我们就开始试用钻头代替铰刀,并且用500粒度的油石背刀刃,以期达到要求。加工的时候,先用图1的油石按螺旋口把φ3钻头
The indexing holes (3A_3) on indexing index plate are small and many, require smoothness_3, and also require the accumulation error of holes on each circle is ± 1 °, so it is difficult to process. The original reamer hole after reaming; but when reaming, the chip is not easy to flow out of the reamer blade crowded bad; hole finish is not good enough; processing a piece of 5 hours to consume 4 to 5 knives. As a rule of thumb, drill-hole finish can reach up to _4, but the accuracy does not meet the tolerance requirements of class A_3. So we started to test the drill bit instead of the reamer, and 500 grain with the blade back to meet the requirements. Processing time, first with the oil stone in Figure 1 according to the screw mouth φ3 drill