The other problem with drill gearboxes and large wheels is that the steel gear carrier pins can shear off - there are usually only three pins per stage and they are not good quality. Once a pin breaks, the gearbox self-destructs.
RobotVersion2.png After thinking about what I could do with the disc in the design I already had. The solution I came up with was to replace the disc with a drum or bar(like that on Trouble Starter) I was wondering how difficult it is to build a drum and also how many motors will I need to run it off and where they should be placed to stop balance problems.
I have posted a basic design idea, the wheels will be at the back allowing for it to be invertible.
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