Help with Motor and Gear Selection and Assembly

Other Hardware Robotics
1

Hey guys/gals, I was hoping someone might have some advice for me.

I just recently picked up a R2D2 toy at WalMart with the intent of throwing a bunch of robotics in it.

Well, while I'm having trouble figuring out how to make it move. I have about a 2x2x5in(HxWxL) space to work with(in the two outer most feet) to fit the motor and part of the wheel in. I should also note, currently the bot is about 4.5lbs as is and 18inches tall.

So what do y'all think? I need to move a bot that is >4.5lbs with a 2 motors, gear assembly, and wheels that will each fit in a space a little smaller than 2x2x5in(HxWxL).

2

I need to move a bot that is >4.5lbs with a 2 motors, gear assembly, and wheels that will each fit in a space a little smaller than 2x2x5in(HxWxL)

You can check the various hobby robotic suppliers for geared motors and check their dimensions.

3

I could, but honestly I'd rather build my gear assembly myself so I can learn the science behind it better... And develop a skill set I can fall back on with future bots.

And sense I have no background in how they are engineered I was hoping someone might have some suggestions.

For example, I'm guessing I probably don't need a 125 oz*in NEMA motor; that, I could get by with something smaller, assuming I have the right gear ratio.

4

I'd rather build my gear assembly myself

Very difficult even if you have access to a well equipped machine shop and the required skills. Almost all gear assemblies are custom manufactured for a specific purpose.