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By ignoblegnome
@ Tue, 2011-09-27 15:42
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Interesting. It looks like the front wheel steers like a motorcycle. The servo seems to be oriented so that the wheel changes angle in the vertical plane, rather than rotating on the horizontal.

Are both rear wheels driven at a constant speed, or do you need to adjust the left and right motor speeds to turn? I'm assuming you run them at the same speed and allow the low friction CD wheels to slide on the nice hard floor surface.

By XicoMBD
@ Tue, 2011-09-27 15:57
XicoMBD's picture

Yes, the idea was taken from a little toy I helped my 7 years old cousin building:

http://www.youtube.com/watch?v=LUMV28tilA8

I found the way it could move interesting and tried to replicate that on this robot :)

 

The back motors are always rotating in the same direction and speed, like if they where connected directly to the 5V and GND.

By ignoblegnome
@ Tue, 2011-09-27 16:03
ignoblegnome's picture

Cool. This would be a good application for one of the Tamiya gear sets that has a single motor and a shaft on each side. Seems a waste of the dual gearbox, but I'm guessing it is what you had around.

Though, I suppose having two separate motors and gear trains allows a bit more slip than if they were both on one fixed axle.

Anyway, very cool robot.

By XicoMBD
@ Tue, 2011-09-27 16:09
XicoMBD's picture

Yes, this was the only gearbox I had ready to use.

Thanks!