Need Help!- threadmilling with BNC code on VM1

[zeptrax]

Hello, I am fairly new to the Winmax control, but not a stranger to G-code on fanuc controls. I am using a threadmill wizard from Advent tools to generate my code and it looks good but when reading the code but the control seems to interepret it differently. There is no change in Z and the G3 moves do not connect correctly, the machine will run the code but the end result is a scalloped shape all on the same Z plane. Shows the same when graphing the toolpath on the control as well.
Do I need the ISNC upgrade to run a helix on this machine (VM1, late 90's vintage)? Or is it more likely that the Utility from Advent is not working correctly? I do need to backplot the code with our Predator software, also might have a copy of Vericut but not sure of our license situation with that one.
Thanks for any help!!

Doug

[zeptrax]

Backplot looks good as well, seems that the control does not like it for some reason. Below is the first of three passes.

Z0.1000
G1 Z-0.5711 F25.
G1 X0.0089 Y-0.1176 F2.
G41 X0.0104 Y-0.1376 D1
G3 X0.1711 Y0.0000 Z-0.5533 I0.0214 J0.1376 F0.6
X0.1482 Y0.0861 Z-0.5473 I-0.1725 J-0.0000 F0.7
X0.0854 Y0.1488 Z-0.5414 I-0.1494 J-0.0867
X-0.0004 Y0.1717 Z-0.5354 I-0.0861 J-0.1500
X-0.0863 Y0.1486 Z-0.5295 I0.0004 J-0.1731
X-0.1492 Y0.0857 Z-0.5235 I0.0870 J-0.1498
X-0.1723 Y-0.0004 Z-0.5176 I0.1504 J-0.0863
X-0.1491 Y-0.0866 Z-0.5116 I0.1737 J0.0004
X-0.0859 Y-0.1497 Z-0.5057 I0.1503 J0.0873
X0.0004 Y-0.1728 Z-0.4997 I0.0866 J0.1509
X0.0869 Y-0.1496 Z-0.4938 I-0.0004 J0.1742
X0.1502 Y-0.0862 Z-0.4878 I-0.0876 J0.1508
X0.1734 Y0.0004 Z-0.4819 I-0.1514 J0.0869
X0.0113 Y0.1375 Z-0.4640 I-0.1394 J-0.0004 F0.6
G1 G40 X0.0000 Y0.0000 F40.0
G0 Z-0.5711

[jetski]

I have great luck doing threads, internal and external on the conversational side of the Hurco. I just got through with some external threaded cores for a molded part. If you are getting scallops it could be the step size is not close enough.

[Rich Carlstedt]

I agree, I have no problem in conversational.
I would believe it is the G code generator having a weird course or incomplete setting

I also notice a change in X, Y, Z , I and J numbers
You are cutting in quadrants, so the numbers should replicate.
Z changes between .0059 and .0060 between blocks ?
These should not change, because you are in a vertical helix
Look at X and Y
I- 0.0861 J-0.1500
X-0.0863 Y 0.1486
X-0.0859 Y-0.1497
X 0.0869 Y-0.1496
Now look at I and J
I0.0870 J0.1498
I0.0866 J0.1509
I0.0876 J0.1508

You have a G code problem. the scallops are irregular Arcs .
Rich



Z-0.5295 I0.0004 J-0.1731
X-0.1492 Y0.0857 Z-0.5235 I0.0870 J-0.1498
X-0.1723 Y-0.0004 Z-0.5176 I0.1504 J-0.0863
X-0.1491 Y-0.0866 Z-0.5116 I0.1737 J0.0004
X-0.0859 Y-0.1497 Z-0.5057 I0.1503 J0.0873
X0.0004 Y-0.1728 Z-0.4997 I0.0866 J0.1509
X0.0869 Y-0.1496 Z-0.4938 I-0.0004 J0.1742
X0.1502 Y-0.0862 Z-0.4878 I-0.0876 J0.1508
X0.1734 Y0.0004 Z-0.4819 I-0.1514 J0.0869