Problem with 4th Axis Plotting

[TURNER]

Hi again,
Try this program snippet in NCPlot. If you make the 'A' value zero the plot works fine, but if you run it like this at A-90.0 plotting is doing funny things.
Please help

%
O4825
G56
G00 X-450.0 Y230.0
G01 A-90.0 F5000

(M12 THREADTOOL STATION 4)
(NOTE CUTTER RAD TO BE SET AT 4.35)
T4M6
G0G17G90X0.Y50.S2744M3
G43Z10.H4
Z2.
G1 Z-18.0 F500
G91 G41 D4 X1.075 Y-4.989 F93
G3 X4.989 Y4.989 Z0.378 R4.989
G3 X0 Y0 Z1.750 I-6.063 J0 F320
G3 X-4.989 Y4.989 Z0.378 R4.989
G1 G40 X-1.075 Y-4.989
G90 G0 Z10.0
Y-50.
G1 Z-18.0 F500
G91 G41 D4 X1.075 Y-4.989 F93
G3 X4.989 Y4.989 Z0.378 R4.989
G3 X0 Y0 Z1.750 I-6.063 J0 F320
G3 X-4.989 Y4.989 Z0.378 R4.989
G1 G40 X-1.075 Y-4.989
G90 G0 Z10.0
Z150.
M1
X-450.0 Y230.0
M30
%

Thanks ...Turner

[MetLHead]

Hi Turner,

I was just looking at this and it seems that the helical arc moves don't work properly when the 4th axis is anywhere but 0. Thanks for catching this, I'll work on taking care of it.

Thanks,
Scott

[TURNER]

Hi Scott
Another problem maybe?
Are your arcs plotting in the correct direction when using G19, they seem to be going the reverse direction to the way the machine cuts ie G02/G03.

Thanks
Turner.

[MetLHead]

Turner,

The arc direction should be OK for G19. The CW/CCW direction is correct when looking from the X+ direction, which is what it should be.

What's the control you're using?

Scott

[TURNER]

Hi Scott,
Ive had a play around with NCPlot and found you were right G19 is plotting correctly, didnt think you would miss something like that. The problem was in the G/M Codes part of the configuration M87 mirror image. Our machine uses M86/M87 for Clamping its fixture its a twin pallet daewoo, so i deleted M87/M88 out of the config and all plots well now
Turner.

[MetLHead]

Turner,

Yes, that makes sense, the mirror image would make your arcs appear backwards. Thanks for letting me know how you fixed this!

By the way, I found and fixed the problem with the helical arcs not plotting correctly with the 4th axis. This will be in the next update.

Thanks,
Scott