Thread: 'Only one G code in same group' Alarm

**fxmachinist** · 12-19-2014, 03:59 AM

I own a Haas VF-2, and I'm using SolidWorks with HSMworks Xpress for CAM. I have a lot of experience manual machining, and I'm doing ok with the CAD/CAM side of things. I don't have any experience with CNC machining, and I'm trying to make some Christmas presents as my first parts. I managed to make my first part with no problems with the software or machine, but my second part, the machine has an error code #339, Only one M, X,Y,Z,A,Q etc. allowed in any block, only one G code in the same group. The program that worked didn't have any G codes paired up in a block, but the one that alarmed out had some lines that had: N20040 G3 X1.1357 Y-2.4181 I-0.2968 J-0.4593, or: N22645 G18 G2 X-0.08 Z-0.08 I0.025 K0. for example. Is this a post processor issue or should I just learn more about G and M codes before I try and play with expensive toys?

**Geof** · 12-19-2014, 05:01 AM

I think it might be having the G18 in the same block as the G02. Try editing the program to put the G18 a line ahead of the G02.

**fxmachinist** · 12-19-2014, 04:32 PM

Thanks for the reply, I'll give that a try. My shop is a 4 hour drive from where I live, and I don't have internet there, so it could be a couple days before I let you know if it worked.

**dcoupar** · 12-19-2014, 05:34 PM

Neither of those blocks should cause that alarm. My guess is the error is some blocks after the machine actually alarms. If you can, post the section of code where the alarm occurs, or even post the entire program.