Custom Gearbox

Hey all I have built a few small scale bots and am now working on a larger 200lb bot. I was wondering if anyone had constructed their own gearbox for a DC motor. If so how did you do it and what kind of gears did you use?


Thank you for any direction you can supply.


@ 200 lbs…

While in reality there are a lot of different ways of moving a 200# robot, for all intents and purposes, there is really only one way:

You’re looking for “wheel chair motors” on ebay. If you are lucky, you will score a couple motors and wheels for less than $200. A big SLA battery is $35-50 depending on how big. You can hack the wheel chair’s control circuitry (if it comes with it) --if not, you are going to be looking at a very big controller (hundreds of dollars).

Beyond that, I am a fan of chain and sprockets. There is a place called “McMaster Carr” that seems to have everything like this.

Here is two links where you

Here is two links where you can found some parts or ideas

this next one is in australia, but can be a source of motor models :


Also, you can use the wipers motor, golf cart motors (often 24VDC) or wheelchair motors, all have a strong torque and can be cheap if you buy used.

others websources