pic: Drivetrain Concept

[PAR_WIG1350]

Originally Posted by crazyStone

yes it can be done and its a good approach and it is our fallback, but if you want to run traction in back and omni in front you can't have different ratios because the wheel size is different whereas if the the gearboxes are seperated the speeds themselves can be altered and allow for the two different wheel sizes to work together.

You can accommodate different wheel sizes driven off of the same gearbox by gearing the wheels at a ratio (to each other) equivalent to the ratios of the wheel sizes. For example, if you have a 4inch and an 8 inch wheel driven off of the same gearbox, by having a 1:1 sprocket ratio between the output and the 4 inch wheel and a 2:1 ratio between the output and the 8 inch wheel they will run at the same ground speed. It is usually lighter to uses different sprockets to accommodate the wheel size difference than to use different gearboxes for the different wheels.