Need Help!- G10 won't recognize B-axis (FANUC O-M)

[CNC-John]

Hi,

We have an older Makino A55 HMC with two pallets. This machine has been sitting idle for a while and the guy who really knew how to program it is gone.

We now have a project for the machine and have got the program running for the first article. We now want to populate the tombstone (5 positions per side, 4 sides) but the G10 code seems to be misbehaving.

We want to set the fixture offset with a G10 and then call the part program as a subprogram, but we are having problems.

The G10 line correctly sets the X, Y, and Z values, but when it hits the B-axis value it sees this as a new command and rotates the pallet without setting the fixture offset for the B-axis.

Here is the line of code:

G90 G10 L2 P0 X0 Y0 Z-21.076 B0 ;

Any help or work-arounds would be greatly appreciated.


Thanks,

-John-

[stevo1]

In your work coordinate page does it display a B value?

X0
Y0
Z-21.076
B0----------is this displayed?

Stevo

[CNC-John]

Stevo,

Yes, its does show the position on all four axis.



The thing that has us puzzled is that up until now the machine has behaved normally. The part that we are doing is machined on 3 sides by rotating the B-axis. Then we flip it over and machine the other three sides.

Everything works just fine until it came time to use up all the positions in the fixture plate. Then the G10 didn't recognize the B coordinate. Interestingly, the G92 command also does not recognize the B coordinate.

I have included a picture of the coordinate screen on the controller, just in case it is helpful.

(Hmm, the picture doesn't seem to show up. You can see it here: http://picasaweb.google.com/johnhuntdesign )

-John-

[stevo1]

So are you saying you can set the B-offset using the G10 setting up until you have used all of the work coordinates? Or does it not work at all. You described it works fine until you use all the positions in the fixture plate???

Are you using all the workoffsets? P1,P2,P3,P4,P5,P6 and then after these have been used you try to reset one of them with the G10 and it does not set?

I see you have P0 in your line of code. Were you using the 0 for example or are you exclusively using the P0 coordinate for all shifts?

Stevo

[cnc-king]

on the older fanuc controller we have to set the B coordinate on a separate line for it to work correctly eg
G90 G10 L20 P1 X10.000 Y10.000 Z10.000
G90 G10 L20 P1 B90.0
don't know if this will work for you

[CNC-John]

The B-offset does not work at all.

We wrote the program and proved it out for the first position on the fixture plate for the first operation, and then for the first position on the fixture plate for the second operation.

The 4-sided tombstone has two first operation fixture plates and two second operation fixture plates.

Then we tried to write a main program that was basically a series of G10 work offset lines and subprogram calls. It worked fine as long as we only changed the work offsets in X, Y, and Z.

When we tried to change to work offset in B to use the other two fixture plates, it did not recognize the B coordinate as part of the work offset. It treated the B as a new command and rotated the pallet, but did not change the work offset for B.

We did try a separate G10 line just for the B-offset, but it still did not recognize the B argument and treated it as a new command, rotating the pallet. This same behavior occurs with the G92 command.

The P0 was an example, but we may also be using it for all of the shifts. I will find out if this is the case and post the info.

Also, I notice that we are using L2, and that you used L20. Is this something that I should look into?

Right now we are running the part, but only using 2 of the 4 sides of the pallet.

Just for general info, each operation works on 3 sides of the part, and therefore contains B-axis commands as part of the program. The part programs are long and we just barely managed to get everything to fit as it is, so we can't just duplicate the programs with different B values to get to the other sides of the pallet.

Right now we are just stumped as to why the G10 and G92 commands don't recognize a B value as a valid argument, and any help is greatly appreciated.

Thanks,

-John-

[beege]

Have you tried using A or C instead of B(with your G10 or G92)? I see it shows B on your display, but maybe its looking for an A in the program?

I'm thinking that a parameter needs changing, but I've no clue to which one that is.

[Mitsui Seiki]

Originally Posted by CNC-John Hi, We have an older Makino A55 HMC with two pallets. This machine has been sitting idle for a while and the guy who really knew how to program it is gone. We now have a project for the machine and have got the program running for the first article. We now want to populate the tombstone (5 positions per side, 4 sides) but the G10 code seems to be misbehaving. We want to set the fixture offset with a G10 and then call the part program as a subprogram, but we are having problems. The G10 line correctly sets the X, Y, and Z values, but when it hits the B-axis value it sees this as a new command and rotates the pallet without setting the fixture offset for the B-axis. Here is the line of code: G90 G10 L2 P0 X0 Y0 Z-21.076 B0 ; Any help or work-arounds would be greatly appreciated. Thanks, -John-

You don't need the B0 in that line.

You can do it this way:
G90 G10 L2 P1 X0 Y0 Z-21.076
G0G90B0
and for the others sides perhaps:
G0 G90 G10 L2 P2 X10 Y5 Z-.5
G90B90

[dcoupar]

Have you tried PUNCHing out the Work Offsets to see what the format looks like?

[massprecision]

We had the same problem with an older A55. I ended up leaving the B out of the G10 line and then call it up in the program. You will have to decide how you want to call your rotations. Either a seperate line for the B using a G10 or calling it in the program and last manual imput into the work offset.