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滚切大质数正齿轮时,必须通过分齿挂轮,进给挂轮和差动挂轮的配合才能得到所要求的齿数,而不能用近似分度的方法完成分齿任务。但《金属切削手册》(上海人民出版社1974年版);《齿轮工手册》(天津科技出版社1978年第二版);《机械工人切削手册》(1978年第二版),都在常用滚齿机的分齿挂轮表中,列入了大质数齿的近似分齿挂轮。使人误认为,使用手册介绍的挂轮在滚齿机上搭配,按照滚切普通正齿轮的方法加工是不会出问题的。滚齿机分齿挂轮计算的通式为:
Rolling large prime number spur gear, must be divided by the gear rack, the feed wheel and the differential hook to get the required number of teeth, and can not be used to approximate the approximate indexing process to complete the task. However, “Metal Cutting Manual” (Shanghai People’s Publishing House, 1974 edition); “Gears Handbook” (Tianjin Science and Technology Press, 1978 second edition); “Manual of Manual Machinists” (1978 second edition) The points in the gear table, the inclusion of a large number of teeth near the gear wheel. People mistakenly believe that the use of hand-wheel gear introduced in the hobbing machine, according to the method of rolling ordinary spur gear is not a problem. Gear hobbing points divided gear wheel is calculated as follows: