挂轮计算在生产实践中有其现实意义,因而理应在教材中有所反映。笔者见到的80年以来出版的金工教材(包括实习教材)中述及挂轮计算的有三处。一是螺纹车削时挂轮计算教材中导出了挂轮计算公式,给出了机床配备的挂轮齿数,并给出了选配挂轮时需满足的两个约束条件——齿数条件及装配条件,形成了完整的挂轮计算体系。所举的例题是公制 The calculation of the hanging wheel has its practical significance in the production practice and should therefore be reflected in the teaching materials. I saw 80 years published in the metalworking materials (including internship teaching materials) mentioned in the calculation of the three rounds. The first is the calculation of rolling gear in the course of thread turning, the formula of the hanging wheel is deduced, the number of gear teeth provided by the machine tool is given, and the two conditions that must be satisfied when selecting the matching wheel are given - the number of teeth and the assembly conditions , Formed a complete system of hanging round of calculation. The example given is metric