Geometry Factor J in Spur Gears

For standard spur gears (based on tooth fillet radius = 0.35/P) From AGMA Information Sheet 225.01.

Number of teeth in mating gear

Number of teeth, N (a) 20-degree full-depth

where:

A - Load applied at highest point of single-tooth contact (sharing).

Load applied at tip of tooth (no sharing).

Number of teeth in mating gear

Number of teeth, N (b) 25-degree full-depth

A - Load applied at highest point of single-tooth contact (sharing).

Load applied at tip of tooth (no sharing).