We are having trouble parting off small bushings. The I.D. is .4375 O.D. is .560 after boring the go/nogo gage is perfect.When we part it off we loose the I.D. diminsion. Tolorance on the .4375 is +.0000 -.0005. When i run them on the manuel lathe there is no problem, but on the cnc is where we...