You can do this by cycling through threading cycles that have different Z start positions. The first cycle might only take one cut then the next two have the Z moved very slightly positive then negative and take a couple of cuts then back to a centered cut, etc, etc. You will probably still get long chips but they are not as thick and strong. Tedious to program but it can work.
Another option is to go through a threading cycle with a 60 degree threading tool down to the acme depth then come in with the acme tool to take out the flanks. Again it is possible to offset the Z to take out each side separately. |