The workshop was great as well as the people I met!
After building my mill at the workshop, taking it home, then taking it all apart again to lock-tite everything, scrape the ways and tune in Mach3, I made my first part today. This is a sidewheel focus comma for a Tasco Custom Shop scope. It's 5.75" from one end to the other.
I had to do a bit of fine filing to smooth out the curves. The Mach3 backlash control appears to be broken, (if I jog in the opposite direction, it takes one more step in the previous direction and then compensates on the next jog.)