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PB problem with the G68

Hello.
I have a problem with the procedure which is used to G68.
The problem looks like this: How do I set kinematics head on the table and it does not generate the second line G68 why (sim07_mill_5ax_fanuc_mm)?

Program.

N1 (OPERATION)
N2 G91 G28 Z0.0
N3 G91 G28 X0.0 Y0.0
N4 G90 G53 G00 B0.0 C0.0
N5 T1 M6
N6 G97 G90 G54
N7 B-20. C45.
N8 G68 X0.0 Y0.0 Z0.0 I0.0 J1. K0.0 R340
>>>> HERE SHOULD BE SECOND LINE G68
N9 G43 H0 S3000 M3 M8
N10
N11
N12 etc.

If I set the kinematics of two in the head it is all ok (sim05_mill_fanuc_mm).

Program.

N1 (OPERATION)
N2 G91 G28 Z0.0
N3 G91 G28 X0.0 Y0.0
N4 G90 G53 G00 B0.0 C0.0
N5 T1 M6
N6 G97 G90 G54
N7 C13.995. B-14,433.
N8 G68 X0.0 Y0.0 Z0.0 I0.0 J1. K0.0 R-14433
N9 G68 X0.0 Y0.0 Z0.0 I1 J0. K0.0 R13.995
N10 G43 H0 S3000 M3 M8
N11
N12
N13 etc.

How to fix it ?

3 REPLIES

Re: PB problem with the G68

Does the simulation run the code output by the postprocessor correctly? A head table post can be written to only need a rotation so that the tool vector is along Z without the need for a second G68. Head/head would need it in a lot of cases. I have head table posts that output only one G68 and work fine. The head (B) rotary affected tool vector only takes one G68 to align with. This case is with table out of TCP chain. With TCP table it is a different story.

NX10.03
Windows 7 Pro

Re: PB problem with the G68

I think that this procedure is responsible for the second line is not polished.
The program I certainly good, and I'm sure it will be two lines of 68. The post of postconfigurator Fanuc generates two lines correctly, but I can not go as fit as that of postbuilder.

Re: PB problem with the G68

It's tough for me to know what you are having a problem with. I opened NX 10 sim07 sample part and it is outputting G68.2 as it is OTB. Fanuc recommends G68.2 to us when using table in TCP chain. It is an extra option. I think there is a switch for G68 like you are talking about in that post. Like I said - simulating (ISV replay - sim07 can do this) should verify your concern that G68 isn't right.

NX10.03
Windows 7 Pro

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