車床上用的活頂尖,它的尖端經使用磨損后,一般都采用下列两种方法来进行修磨:甲) 将活頂尖的頂尖部分与外壳紧连成一个整体,并使它們一同旋轉而进行修磨(跟磨普通死頂尖一样);乙) 使外壳固定不动,而只讓顶尖旋轉,来进行修磨(具体方法可参閱本刊57年5期“磨活顶尖的方法”一文)。这两种方法虽然都可以把頂尖的尖端磨銳,但所产生的誤差却不同 The living center of a lathe, whose tip has been worn down and worn, is generally dressed in two ways: A) Tying the top of the living tip into tight contact with the shell and rotating them together Grinding (with the same general death top); B) the housing fixed, leaving only the top rotation, to repair the grinding (specific methods can be found in 57 of this issue 5 “grinding the top method” article) . Both of these methods sharpen the cutting edge but produce different errors