C618车床配有齿数为36、44、45、48、70、80、90、95、96、120、127的十一种挂轮。但标牌所示每套挂轮能加工的螺纹导程(螺距)范围不大,而且当导程大亍1mm时,加工内、外表面的自动进给量太大,往往要以手动进给来代替,既影响加工质量,又增加劳动强度。另外标牌上没有给出加工蜗杆的挂轮比。为了改进C618车床加工公制螺纹和模数蜗杆的挂轮系统,需要增加108齿和66齿的挂轮各一件(若不加工蜗杆,只需108齿)。该机床诺登手柄六孔位的齿数比分别是:4/6、(?)/6、6/6、7/6、8/6和10/6。倍增手柄Ⅰ和Ⅱ位置的速比分别是:1/2和2/1。丝杠螺距是6mm,要在该机床加工螺纹必须满足下式: 工件导程=i_挂×i_诺×i_倍×t_丝 C618 lathe equipped with teeth for 36,44,45,48,70,80,90,95,96,120,127 eleven kinds of hanging wheel. However, the plate shown in each plate can be processed thread guide (pitch) range, and when the lead is greater than 1mm, the processing, the outer surface of the automatic feed is too large, often to manually feed instead, Both affect the quality of processing, but also increase the labor intensity. In addition the sign does not give the processing of the worm gear ratio. In order to improve the gear system of metric thread and module worm for C618 lathe, it is necessary to add one gear for each of 108 teeth and 66 teeth (only 108 teeth if the worm is not machined). The number of teeth on the machine’s six-hole Norden handle is 4/6, (?) / 6, 6/6, 7/6, 8/6 and 10/6 respectively. The speed ratios of double handles I and II are: 1/2 and 2/1, respectively. Screw pitch is 6mm, to be processed in the machine thread must meet the following equation: Workpiece lead = i_ linked × i_ promise × i_ times × t_ wire