Motor and gearbox ideas

[Efroeh]

Originally Posted by RCP57

What scale are you planning to build? I would buy some round gear motors(powerful!) and install one on each wheel. Each pair held together with a tube to create and axle housing. Depending on the size of wheel I would suggest using something in the 100rpm or less range. Probably around 50-60rpm would be plenty fast if your tires are 4-5" tall.

what kind of gear motors would you suggest? I am new the motor on axle thing and to make it work. ive been looking on robot shop and there are tons. they don't seem very strong 100 oz of torque doesn't seem like much?

[Rimrock]

Putting gear-motors in a tube for axle is 'number 1' when it comes to dependability for wheel loaders, articulated dumpers and so on, in my opinion. To get enough power for like 5'' wheels one should go for 540 motor size, that will say the pipe should be like 40-42 mm outside, a standard tube called 1-1/4'' I believe (need to be machined to size internaly). There are different kinds of gearmotors with a 540 size motors around, but many of them are the typical 'china ebay' stuff, too weak. If you could get hold of this type of motor as shown in the link, you don't need to worry about power...The one that have 50-60 rpm at 12V (approx 5'' wheels) They are branded 'MFA' in Europe. This company are located in England, I would think they possible ship overseas too.
http://www.mfacomodrills.com/gearboxes/942d_series.html