The wire size is dependant on the amps you'll be pulling through it, as well as the length of the run. You need to add up the draw of each of your planned machines, (plus any other load you plan to pull of your subpanel). Then figure out your actual run length.
I don't have a specific answer for your situation, but I'd start by plugging some numbers into one of the many online wire size calculators. Here's a link to an easy-to-use one. There are many others out there.
Hope that helps...
- Marty -
When you earnestly believe you can compensate for a lack of skill by doubling your efforts, there’s no end to what you can’t do…