I'll have to get back to you a bit later, entertaining a sloshed family memeber

Whacko

YEAH............I'VE GOT SEVERAL MYSELF. FIRST THINGS FIRST.

In the G76 cycle the L word is the one that controls the exit angle, try L90 and a slow speed, 200 RPM, you may be able to go faster but it depends on the speed of your system.

Graham.

As mentioned earlier, I tried various L angles. 0,30,45 and 60 deg. with no difference. The manual says L is optional so rather than leaving it out of the line I just put L0 assuming that would be the same as no entry. I'll try L90 tomorrow and slow it down a bit.
I hope I don't have to slow it too much just to get it to pull out right. Everything else is perfect at 700-800 rpm.
Thanks,
RC

If you think about what's happening here, you are asking the tool to feed out of the thread in 1/4 of a turn of the thread.

If you are running at 750 RPM that is 12.5 revs per second, that means the tool has to get out of the thread in 0.02 seconds. Not in my life time  .

That is why it has to run sllloooowwww.

Graham.

Ahhhhhhh..........YES. Now that you put it that way, it makes a lot of sense.
That would be asking a bit much at high rpm.
Hopefully, the groove will be acceptable.
Thanks Graham,
RC

 

Graham.

Graham,
This is strange to me...when I put in L90, the threading cut started in the opposite direction...towards the tailstock and kept on all the way to the Z+ limit. Entry <90 works OK.
Is this normal ?
Thanks,
RC

That's a new one to me, I have asked Art for comments.

Graham.

Hi Graham:

  The G76 is actually a macro M1076.m1s located in the Mach3 folder. Ill ask Brian to add
that to his list, I suspect the math falls apart at 90 degrees . I suspect the math is falling apart over 89..

Art