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The circuitry probably cannot handle a bigger motor. A simpler solution would be to just make a servo yourself - motor driver, motor, and a encoder/potentiometer.
Well if it's on a track does it have wheels other than the drive wheels? You could put the encoder on the wheels that aren't being driven should eliminate the wheel slip throwing your encoders off.
[...] this should illuminate the whole bloody problem,
Hi,Quote from: Polemus on April 01, 2009, 03:23:29 PM[...] this should illuminate the whole bloody problem, Perhaps, but it won't eliminate it.You could (=should) mark the spots on the track (where you want to stop) in a machine readable form. Any dead reckoning method will accumulate errors.At the very least, return to one of the track-ends every now and then to give it a clean start.An extra wheel with just a modest amount of friction, held to the ground with (a) spring(s), will have no reason to skip, skid or slide, but markers on the track will be the only way to ensure months of precision.