This is a steel gearset for a 6x planetary gearbox, like used in the qdd100 and other Mini-Cheetah style servos. It fits inside the stator of 8108 and larger sized motors. A center distance of 30.0mm is appropriate.
It includes 1 ring gear, 1 sun gear, and 3 planet gears with installed needle bearings.
Ring gear specifications:
100 too
Center Distance
30.0 mm
Ring Gear
100 teeth, OD 55 mm, width 5 mm, mass 15.2 g, 42CrMo steel, HRC 25
Sun Gear
20 teeth, tooth length 6 mm, overall length 18 mm, hub diameter 11 mm, bore diameter 4 mm, mass 10.2 g, C 40Cr steel, HRC 25
Planet Gears
40 teeth, tooth length 5 mm, overall length 6 mm, hub diameter 14 mm, bore diameter 10 mm, mass 10.9 g with bearing, C 40Cr steel, HRC 25