Help with Acme threading on SL3H

[JL Fabrication]

I am hoping someone can help me with a programing/ threading problem. I have a mori SL3H with LX-1 Control

I am threading 5/8" 7 pitch acme thread which is a non standard thread. I have everything worked out fine except the termination point of the threads. In the picture you can see I end up with a razor sharp thread as the last thread.

In the second picture is a sample part which I would prefer where the tread terminates as a full thread.

How do I go about doing this??

[ken70ss396@yaho]

In the first example you can see a chamfer pullout at the end of the thread.
Are you using a G76 cycle? If so, on the first G76 line you will have a P followed by number of values. Example G76 P010060. The first 01 represents the number of spring passes.
The next 00 represents the chamfer amount pullout. 00 equals a straight pullout. To calculate the chamfer amount of pullout, multiply the two digit value(example 05 instead of 00), by the thread pitch. Example P010560=05 x .111= .0556 chamfer length.
The 06 is the thread angle.
The line would finish with Q0050 = minimum depth of pass, no decimal point . Then R0.0005 =depth of last thread pass.
G76 P010560 Q0050 R0.0005 .
For your part you may need to try 10 to replace the 00, for full thread pitch pullout amount. You may also need to decrease the z length by 1x thread pitch.

[JL Fabrication]

Thanks for the reply I will give it a try in a few days. My lathe is down at the moment I had one of the drive cards go bad. Hopefully I will get it up and going soon.

Jason