I was having trouble parting off some parts the other day that were .393” dia with a .075” chamfer. The problem was that the parting tool was cutting the part off before it had a chance to add the chamfer. After looking thru the parameter manual and the TPC data section of the programming manual for grooving process, the only possible parameters that I could find that may control the amount of over shoot was “Groove start clearance (diametral value) in X-axis” U8. Noted the original setting of .2”, and did some test cuts which worked fine and settled on a value of .05”.
My question is this: Is this the correct parameter to use in this case and what is the typical amount (value) that should be used to allow for proper clearance?
Also, when a value is changed on the TPC date page, does that change just the associated value for that program or does it effect any program the same as changing the U8 value in the normal parameter section?
T32-B QT-8 Mazatrol program.