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The idea of using an Arduino to do the work is what got me thinking. In my mind, I was stuck on the idea of needing a mechanical linkage. I saw one design where a person used a flex shaft tied to a pulley on the spindle, into some more gears to drive an indexing head. I was really stuck on...

I'm mostly here to just say thanks. I'm a small r&d company who needs what amounts to an individual as a bunch of gears (around 100) but a minuscule quantity to most gear shops. I'm looking at the cost of just stainless steel spur gears costing about $20/gear. I can buy a lot of tools for...