Hi guys (I guess that is not sexist since I didn't see any female posts),
Rob: Main Panel to Sub-panel is 16 inches.
Jim: No I do Not have two separate 30 amp breakers. They are tied together for their correct use.
Each 220 v machine has its own dedicated breakers and line.
Dust collector is 55 inches from the Main Panel. It is not in the sub-panel.
All wiring runs are well within specs. No two pieces of big equipment run from the same breaker (of course they do run from the same Main).
I have never tripped a breaker in the shop...Well, I lie a bit...I found out things happen fast when you drill into a Romex cable.
Thanks for the interest and the concerns.