[Burly Products]

We have a 1980 Milacron Avenger Lathe with a Acramatic 850 SX Control. We use Master Cam Lathe 8 and the generic Cincinnati post processor. On to our problem.

We are trying to thread a 2-1/2"-8TPI NPT Internal thread. Mastercam is posting

G32X....Z.....I.-.0039K.125

According to the Cincinnati books the I(using the G32) cannot have a minus symbol or the decimal. It would also prefer the K.125 to be K8.

We have cycled the code and it is doing some very strange things. It is cutting at an angle. However at the end of the slope it jumps up then out then back down. If we weren't cutting air the machine and part would be destroyed.

Any thoughts or suggestions would be much appreciated.

[Avenger5]

First of all check your Tool Setup for the threading tool you are using it is most likely setup for O.D. threading that is why it pulls up and out rather than down and out from the thread.
The K value is correct at .125 because it wants the lead distance (the amount between each thread peak) not the threads per inch, if you prefer you can have it ( K 1/8 ) in fraction form.

You listed your Avenger as a 1980 machine; Is that a Typo? I have never heard of an Avenger that old before.