[Kevin Sevcik]

Originally Posted by Retired Starman

If you go with a smooth disk and belt, you might want to use a 10 turn precision pot or encoder on a drive puck to sense your disk movement rather than trying to measure the motion through encoders on the gear box. McMaster Carr sells multi-turn precision pots but they call them "variable output switches".

Why not Mouser? I suspect the cheapest 10-turn 10k at Mouser is as good as MC-Master's standard one for around half the price. And you can get 0.1% linear wire-wound pots for as much as Mc-Master's standard pot.