pic: Team 192's 2016 Gearbox

[Mihir Juvvadi]

Originally Posted by Joe Johnson

First, whoa! that's some nice nice engineering.
I am always puzzled when folks tell me a fps and don't give me the size of the wheel or the ratio from the motor to the wheel. What do I do with that? If you have 3ft drive wheels it means one thing, if you are going with 2" wheels it's a completely different beast.

So... what size wheels to you have? And what are the ratio from motor to the wheel?

Also, is that hex shaft peeking out go to a direct drive live shaft (that drives the wheels) or do you have another belt/chain/gear stage between the wheel axle and the hex output shaft?

Also, can you just break it down to the gearbox I'm looking at? What are the ratios from the motor shafts to the output shaft?

Alright. This years bot runs 6 inch wheels, so those speeds from earlier are for 6 inch wheels.

The reduction within the gearboxes is 18.7:1 and 8.4:1. There is an addition reduction in the pulleys out to the main drive wheels (1.2:1).

The hex shaft you see on the back fits the drive pulley of the transmission, which goes out to the main drive wheels via more belts.

So the reductions step by step: 18:50 in the pulley; 14:30 first stage; 24:34 high gear and 14:44 low gear; finally 18:22 in the pulleys of the wheels.