Thanks to Gary Campbell and G Burkhardt I think I have my reduction box figured out for my indexer build. This reducer will give me a 25:1 reduction with 0.0556 degrees per step and a resolution of 0.004 inches on the surface of an 8 inch diameter cylinder. Unless I am mistaken of course. Oddly the source for the gears did not seem to stock the 8mm pitch belts, so I had to source them elsewhere. I used the cad model for a 56 tooth pulley to build my 70 tooth pulley models but still needed to adjust the pressure angle of the teeth. I will be having a Haas mill make the gears for me so that I don't have to rely on the shopbot for that, although it probably could do a decent job of it. I also added tensioners to the pulley system in order to allow for a smaller box and increased tooth contact on the smaller pulley.
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