I'm running an ID thread on a Doosan TT1800SY which has a Fanuc 18i control. The G76 threading cylce seems to not be working properly.
Here is the code:
G76 P010029 Q50 R40
G76 X-2.400 Z-3.265 P980 Q160 F1.6666
The problem is that the infeed for each pass is only .005 per side. This means that I will have 18 passes to cut this thread. I don't mind the extra time, but the inserts want more of a cut than .005 per side.
It seems that the infeed is actually restricted on the high side by the Q word in the first line of the G76 command. If I change the Q word in the first line to Q100, the result will be an infeed of .010 per side for each pass. This can't be correct, or am I just nuts to think that fanuc should actually vary the infeed depth as advertised.
It seems that the dmin is actually the depth of cut for each pass...
Please help.
Josh