Looking to start the r/c Tachikoma project back up, and will be needing to purchase new motors. I’m not sure what I should be getting since I don’t have first hand experience with what the torque numbers supplied on the spec sheet mean in real world terms.
There will be four motors driving a set of mecanum wheels. I want the maximum forward straight line speed to be at least equal to a fast walking pace (~4mph), so with the 60mm diameter wheels I’ll be using I’ll need roughly 500 RPM. Pololu has a 530 RPM motor with a stall torque of 120 oz-in, and a 1000 RPM motor that stalls at 68 oz-in.
My question is I don’t know how much force 68 oz-in or 120 oz-in is in real world terms. Is that a lot, or fairly puny? I’d love to be able to have the faster motors, but don’t know if I need the extra torque, or am totally off and have more power than needed.
I already have compatible motor controllers (these), r/c gear, batteries, etc.
Any suggestions/advice? Thanks!