[wozzwinkl]

Hello all.

I got my CAM program (MecSoft VisualMill) outputting G code that works for circular interpolation. I made up a test program and tried it out, and it worked great on both clockwise and counter-clockwise arcs.

Here's the problem: it only works in G54/E01 offset. If I try running the same program in G55/E02, as soon as it gets to the arc line it just stops with no error. The spindle keeps spinning and the coolant keeps flowing, but the movement stops and the program will not continue. The file is exactly the same except for the fixture offset.

Here is the format of the output:
G17
G03 X5.2500 Y0.0000 R1.0000 F60.
G02 X-5.2500 Y0.0000 R5.2500 F80.

Is my problem the radius output instead of the I,J output?

Any help would be greatly appreciated.

Thanks,
Jon

[D.D.Machine]

are you in cutter comp?
is your fixture offset only as E1 and E2 ?

You will need a X or Y move to get it to the next E offset... even it if its the same place you have to tell it to go there.

I can see a few things that don`t look right.

G17 ( puts you in the right X/Y plain for a arc )
G03 X5.2500 y0.0000 r1.0000 f60. ( line is ok)
G02 X-5.2500 y0.000 r5.2500 f80. ( how is it getting from x5.2500 over to x-5.2500 ???? I think that's the hangup... you need to do a g1 x-5.2500 y0. move between them.

[wozzwinkl]

D.D.Machine- thanks for taking the time to think about this problem!

I am running in Format 2, so everything is specified as G54/G55. Also, there is no fixture change within the program. I had tried writing out a different program in G55 offset and when it kept failing I tried manually changing the offset to G54, which made things work.

Sorry that I did not include the complete test file before. Here it is in its entirety:

%
:O001
(Tests)
(Work Zero)
G54
(10in dia circle outside profile - T01)
(CUTTER COMP OFF, CANCEL CYCLES, XY PLANE, ABS MODE)
G0 G40 G80 G17 G90
(0.5 DIA. TOOL)
T01 M6
(SELECT WORK OFFSET, START SPINDLE)
G54 G90 S10000 M3
(SELECT HEIGHT ADJUST REGISTER)
G0 G43 H01 Z1.0000
G0 X7.2500 Y1.0000
Z0.2500
G1 X7.2500 Y1.0000 Z0.0000 F40.
X6.2500 Y1.0000 Z0.0000 F60.
G17
G03 X5.2500 Y0.0000 R1.0000 F60.
G02 X-5.2500 Y0.0000 R5.2500 F80.
X5.2500 Y0.0000 R5.2500
G03 X6.2500 Y-1.0000 R1.0000 F100.
G1 X7.2500 Y-1.0000 Z0.0000 F120.
G0 X7.2500 Y-1.0000
Z0.2500
(10in dia circle inside profile - T01)
X2.7500 Y-1.0000
Z0.2500
G1 X2.7500 Y-1.0000 Z0.0000 F40.
X3.7500 Y-1.0000 Z0.0000 F60.
G03 X4.7500 Y0.0000 R1.0000 F60.
X-4.7500 Y0.0000 R4.7500 F80.
X4.7500 Y0.0000 R4.7500
X3.7500 Y1.0000 R1.0000 F100.
G1 X2.7500 Y1.0000 Z0.0000 F120.
G0 X2.7500 Y1.0000
Z0.2500
G0 G91 G28 Z0 M5
G90 G0 E0 X0.0 Y9.0
M30
%

I believe that "jump" you see is not a jump, because that is the next arc end point it is moving to, along the specified radius. This is moving a 0.5" diameter tool along the outside of a 10" diameter circle.

Any more thoughts?

Thanks again,
Jon

[DareBee]

I have EXACT same machine and use VM6 Pro
I program using IJK instead of R though.
Try using G57 and G58 to see if they work - as ridiculous as it may seem, my machine control has one fixture offset that is corrupt.

[wozzwinkl]

Thank you for posting!

I will definitely test out my offsets to see if they are causing the problem as soon as the current job completes.

How does your corrupt offset manifest? Is it something like mine with arcs not wanting to work? I have not noticed any other problems with my G55.

Would you be willing to share your VM post with me? I'd rather output IJK...

Thanks again!

-Jon

[DareBee]

How does your corrupt offset manifest? - I can't remember, it has been too many years since i flagged it.
PM me your email and I will send my posts