“机械工人”(冷加工)57年8期12页介绍了孙宗武同志编译的“铣制平板凸轮的方法”一文。我们感到有两点需要加以补充,现提出如下: 1.原文中计算挂轮和a角时,公式中都有H。而H的选择在原文13页16行中说:“一般可在50～100公厘的范围内选择。”我们感到在50～100公厘范围内选择H是不妥当的。因为当H较小时,则Sina就有可能大于1,而大于1的Sina是不存在的;当H较大时,在铣削中工 “Machinist” (Cold Working) 57, No 8, p. 12 This article introduces a paper entitled “Method for Milling Flat Cam” compiled by Comrade Sun Zongwu. We feel that there are two things that need to be supplemented. Now we propose the following: 1. In the original calculation, there is H. The choice of H, on page 13, line 16, states: “It is generally possible to choose between 50 and 100 millimeters.” We felt it was inappropriate to choose between 50 and 100 millimeters. Because when H is small, then Sina may be greater than 1, while Sina greater than 1 does not exist; when H is large,