I need to get off my computer and go outside or something…
Anyway, this is a gearbox designed to take two fisher price motors and sort of goes along with my arm joint idea. I’m trying to minimize the amount of machining on gears that would have to be done (seeing as I’ve never actually designed or built a gearbox), so this gearbox uses AM toughbox gears and the second stage reduction from the fisher price gearbox that has come in the kit in the past. The parts that need to be machined are the 3/8" hex axles, the standoffs, and the two 1/4" aluminum plates (also the spacers, but I didn’t put them in yet). Total dimensions are 3.5" x 8.5" x 2.125".
Since I’ve never made one of these, I was hoping some more experienced people could give some criticism. From other gearboxes I’ve seen, there are always a few thousandths added to the nominal center to center distances between meshing gears. I added 3 thousandths to all of the meshes in this gearbox (just like on the Toughbox), is this too much? Too little? Not make a difference?
Also, has anyone had success in the past running two FP motors through one of the plastic gears provided in the kit?
Thanks in advance for any tips.