本刊81年第4期上刊登的“扩大C618车床加工范围”一文对我们启发很大。但我们认为文章中介绍的方法是有欠缺的。原文的重点是以增加挂轮数量,来满足部分走刀量细化的要求和达到加工蜗杆螺纹的目的。因为这种车床已有挂轮11只,再增加挂轮也会带来不便;另外,对细化走刀量也有局限性,加上用了40齿的这一组挂轮中心距也不够。我们针对用户的反映, The 4th issue of 81, published in the article “to expand the scope of C618 lathe processing” a great inspiration to us. However, we think the method described in the article is deficient. The emphasis of the original text is to increase the number of hanging wheels to meet some of the requirements of cutting the amount of thinning and to achieve the purpose of processing worm screw. Because this type of lathe has a revolving wheel 11, and then increase the wheel will also bring inconvenience; In addition, the amount of refinement has limitations, coupled with the use of 40 teeth in this group is not enough hearth. We reflect the user’s response,