Posting SFM with G96

[Tinman62]

I'm new to post builder and i'm try to get SFM to post out with G96 but only seem to get spindle speed. If I switch to SFM in part file I can get it but then I lose my G97S##M03 in program. Any help.

 

[joycejo]

"I'm new to post builder and i'm try to get SFM to post out with G96 but only seem to get spindle speed. If I switch to SFM in part file I can get it but then I lose my G97S##M03 in program"

You can't get both at the same time if that'w what your loking for. The machine will only read one.

Make sure the spindle commands are set correctly in your post. You may need to creat a lathe control operation to set the initial speed to rpm prior to moving, you can also set a approach marker in the machine control part of the operation and then an extra spindle speed to set your SFM.
You may need to force the G96/G97 output so it will change.




John Joyce
N.C. Programming Supervisor
Barnes Aerospace, Windsor CT
NX6.0.5.3

 

[Tinman62]

I start in RPM G97S###M03 Then call up tool. Set max spindle with G92S###. Then I set my SFM with G96S###. When I call up G96 I don't get SFM I get spindle speed. Attached is a copy of sample program created by post builder. Every looks similar to old program we now use except for the SFM call out.

 

[moudy1]

If you always want this at the tool change then add a new block to Auto Tool Change that contains "G spindle G97 spindle output(RPM)" "S user defined with $mom_spindle_rpm as expression" "M spindle (clw/cclw)"

 

[Jaydenn]

Here is a sample on my posted output. Is this what you're looking for?

N19 ( RGH-FACE-FRONT-0.005-STK )
N20 G54
N21 M41
N22 T0101
N23 G97 S183 M03 <----starts spindle in RPM
N24 G50 S450 <----G50 is "max RPM" on this machine
N25 G96 S500 M03 <----changes to surface mode
N26 G00 M08
N27 G00 X10.462 Z2.165

There is nothing really special to do in postbuilder.
Make sure you have "PB_CMD_spindle_sfm_prestart" and "PB_CMD_output_spindle" custom commands in the Initial and First move events.
See attached photo.

Good Luck,
J




NX 6.0.5.3