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If I may jump in :-)
The encoders actually have up-gear .. meaning instead of slowing down, they are actually speeded up.
This way, you can get numbers Steve was mentioning in his post.
In my own implementation of Bartel's system, I use 120mm diameter wheel, on which 6mm dia roller is riding, coupled with 48 slot encoder plate (from serial mechanical mouse).
This is ~20x up-gearing.
This way I am getting ~7500 ticks per axle rotation.
Last edited by bojan; 11-08-2010 at 06:36 PM.
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