I know this must sound insane, but if you have a moment, I'm wondering how others approach the following 2 choices for 4th axis work:
1. Touch the OD of the part & make that Z0. (And retouch them again for different sized parts).
2. Have all your tools set on the centerline of the 4th axis & use the work coordinate to type-in half of the part's diameter (which does not require touching-off every tool again because of a different size part).
Some advantages can be noted for option #2. As already stated, different OD sizes just requires the operator to type in (half) the diameter... AND it doesn't matter if the program is written off the OD or written off the center. If written off the center, the Z work coordinate is 0.0000, and if it is written off the top of the OD, he (again) just types in the value in accordance with the part's OD.
My apologies for bringing up such an elementary issue, but disscussions around this shop have sparked the question, "What do other machine shop mill-hands do?"