So following in the footsteps of our patron saints AvE & Dave Jones, I took apart my gear box to see what secrets it held inside. Here is what I have found…
The gearbox (from my counting) as a 23:1 ratio from the motor output to output shaft. Both ends of the output shaft ride on a shielded bearing. Most of the gears are powdered metal with the exception of the worm shaft(motor output, single toothed, brass?) and the worm wheel (plastic). Each gear is held in place with steel shafts with brass or delrin bushings to maintain alignment. There are 4 gear interactions in the whole set. The worm gear is non-throated and gives the gearbox its self locking feature. (the output shaft cannot turn independently from the motor without damaging the worm-gear.)
When fed with 12 volts the motor spins the output shaft at ~20.5 RPM (visually counted) consuming ~390-510mA
When fed with 24 volts the motor spins the output shaft at 41-42 RPM (measure with photo-tachometer)
Here is a picture of the output shaft side of the motor with threaded holes for mounting with M4 screws. The Output shaft is a nominal 8mm shaft with a flat ground into it for positive clamping with the sprocket drive gear.
The motor has a band that supports the magnetic flux. On it is stamped ‘K-8F773E222’
Here is a picture under the encoder cover.
Hope this was interesting and maybe helpful.