I'm not an electrician either, but I think you're a little light on wire. #14 for 15 amp circuits, #12 for 20 amp circuits and #10 for 30 amp circuits. A 220 volt circuit just draws power from both legs of a single phase residential panel. Most motors up to 2hp can be run on a 20amp 220v circuit. Generally speaking, I don't think 15 amp circuits in a shop are a good idea, just too little capacity. Heavy 220v loads should be wired IAW equipment specifications.