今以左旋齿轮为例:将分度头安装在铣床工作台上,插律检查符合要求后装上斜齿轮。选择一个比较好的齿作为测量对象。将百分表座装在床身上,不随工作台移动,表头压在齿的一端A点,指针调到“0”(图1)。将工作台向右移动,并转动分度头使齿轮顺时针转动,到齿轮移到B点与指针指“0”时为止。这时工作台走过的距离即为螺旋线 Take the L-toothed gear as an example: Install the indexing head on the milling machine workbench, check the helical gear after the quality inspection is completed. Choose a better tooth as the measurement object. The dial gauge seat mounted on the bed, does not move with the table, the table pressure at one end of the tooth A point, the pointer transferred to “0” (Figure 1). Move the workbench to the right and turn the indexing head to turn the gear clockwise, until the gear moves to point B and the hand points to “0”. At this time the distance walked the workbench is the spiral