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on the small wheel, i mostly use 1/2 and 3/4". i changed out the top metal wheel of the platen attachment to a 2" contact wheel for use while grinding gentle curves without having to change tooling arms.
3/4" for my small wheel attachment. I may add some more small wheels but,
I use a 2" contact for the top wheel of my flat platen, and a 3" wheel on the bottom. That makes a lot of possible radius's.