Mr. HFD: I've seen your posts before so I know you are one smart guy. This time, tho, your assumtion that the feedrate should be the same as the Z axis feedrate is wrong. Witness the F1500. I think my Z axis is 1430 IPM for max rapid, tho I would have to find one of those pesky manuals to be sure.
We have 3 of this model. Meaning we should also have 3 sets of manuals. Just made a quick run thru the shop & our library. Will try harder tomorrow to find one.
Both: The move is a ZC. I don't see what the diameter would have to do with my feedrate. Since it is brass, I am running RPM wide open. There are 6 vanes at .026+/-.001 thick.
Mr. Weed: I looked at your link. Only one formula looked like it was close, but I don't think it is the correct one tho I definitely could be wrong. It is using Diameter as part of the formula. If I changed the X.14 to X1.5 and ran my current program, I don't see why the feedrate should change. It is a function of the distance traveled in Z while the C axis rotates 52 degrees.
I'm glad I have a couple good mill guys helping me out. Thanks.
EDIT: O.D. is .426 diameter.