12.6 Number of teeth

The numbers NP {z1} and NG{z2} represent the number of teeth on the ’pinion’ and ’gear’ respectively. As a default the data of the pinion is input in the left column, the data of the gear in the right column.

For spur gears you need a minimum number of 17 teeth to avoid undercut without any profile shift. You can achive a smaller number of teeth with an appropriate profile shift factor or using helical gears.