pic: Vex Face Bearing Gusset Gearbox

[aldaeron]

Originally Posted by asid61

You can only attach certain formats, and even then only up to 2MB. Uploading to Drive or GrabCAD first helps. I recommend the latter because it has infinite file storage and revision control for free.

I knew one of the many gearbox designers would know how to help. Added link to the STEP above.

Originally Posted by asid61

Looks pretty neat. What gusset does this use again? What size gears can you use?

It is the .090 sheet metal Vex Face Bearing Gusset. It is sized for 84 Tooth 20 DP gears (C-C is 2.103). Vex Drawing is here.

Basically you get two gear reduction pairs of any two hex bore 20 DP gears that add to 84 teeth. The largest reduction is 66:18 (3.67).

It may not be as reuseable as other gearboxes and does take some assembly work, but is an entry level way to get into custom gearbox design. I think you could stack two 6" pieces of VersaFrame and make a standalone gearbox if you want.

I haven't priced it (depends on your gear choices and if you go as crazy as I did with extra supporting gussets). My quick calc says as shown it is $50 plus the cost of the 5 gears (~$50), plus the mounting hardware, collars and shaft pieces. Not as cheap as the Vex Double Reduction at $60, but not bad for a custom gearbox with no CNC required IMO.

-matto-