This is a project I’ve been working on. It’s a dual fp gear box, it would be great to get some feed back for improvements so post away.
-roughly 12in by 6.75in
-using AM planetary gearbox
-total gear reduction 176.16:1
-24 pitch gears
-axles all hex except part of output where there is a sprocket
-made from 4 separate pieces of .100in thick aluminum because its what the laser can make good cuts on with this specific material
If you are going to be making your own custom gearbox anyway, I would not use the AM planetaries and include the reduction in the gearbox (AM products are great but sometimes you can do it yourself and save weight/money).
You may be able to get the gearbox more compact depending on the size (Pitch diameter) gears you use and how you arrange them.
We had a similar transmission design to run ball pickup rollers a few years back, and enlarged the F/P mounting holes so we could get an allen wrench in to remove the F/P mounting bolts that hold the motors to the transmission plate. Makes it easy to remove the motors if they need replacement.
I would recommend the same for the A/M planetary transmissions mounting bolts.
Additionally, make sure you have ventialation channels machined in the mating surface between the F/P motors and the input plate side of the A/M planetary transmissions. This is the only cooling the F/P motors get.
The size and shape of the gearbox are specific to a project were working on and fits very nicely vertically in the space its required. The reason for going big was that we have many of the large gears kicking around plus i wanted to keep it to minimal stages. So really the gearbox isn’t costing much because its being laser cut along with a much bigger project which is the main focus.