Figure 1 shows a spline shaft and teeth together. The teeth of a hob form a trapezia with two lines from sides under angle @. See Figure 1, which shows a spline shaft and teeth, pictured together. If ...

This angle is significant because the magnetically attracted rotor tooth must stop more than halfway between the stator's teeth to align properly (7.2° between rotor teeth divided by two = 3.6°).

Comprehensive analysis of Teeth Whitening Systems Procedures and Prophylaxis Angles & Cups Procedures. Detailed country-wise data for the US, Canada, and Mexico.