Hi everyone, I’m using lightburn 9.24 with a grbl 1.1h plasma table. I’ve been able to cut out silhouettes with relative ease using lightburn. However, when it comes to slightly more substantial designs I have been having a harder time. while trying to figure out how to cut shapes from within another shape I keep failing partially because of not being able to dwell while beginning a cut, which isn’t an issue with a silhouette where I only have one outer cut to worry about and I can set the lead in to .5in which is long enough to pierce even without dwelling.
When I add a start pause time the machine pauses without enabling the plasma until after the pause(makes sense).
When I also enable cut through it still pauses without enabling the plasma(seems incorrect)
I have had constant power enabled this whole time so you know.
Also, I turned laser mode off because I read somewhere that it would allow for proper dwelling… it hasn’t appeared helpful yet and in fact, it may be the cause of the zig-zagging you’ll read about next probably because the machine believes it is spinning in between moves Idk.(perhaps ill enable laser mode tomorrow and try the same file tomorrow, doesnt fix the dwell though)
on my latest test, it appears as though the machine moved to the first cut fine (didn’t dwell correctly even with laser mode on with other cuts it hasn’t) but I let it go anyway just to see, and then it didn’t turn off the plasma till the end of the whole project lol so I ended up with lines zig-zagging throughout it.
Now I’m no gcode master (there is no but in there) and I’m wondering if this is correct to allow dwell time, this is straight from lightburn for a 1.5in square. not the test bracket with internal holes I was attempting but I assume it will work the same
I’m wondering why in the beginning it states “m4” then goes to “m3” but with an “S0” instead of S1000(if im not mistaken 0 means no power output while 1000 means full tilt) I truly don’t know
This is with 1000ms start pause time, cut through and constant power enabled
Before you check out the gcode im also wondering if m3 even works with grbl because I tried to use sheetcam then lightburn to send the code and sheetcam by default I guess only output m3 With no “S” code attached and the machine ghost cut(plasma no on) I’ve never tried start pause time or cut through on my co2 laser which is also a grbl 1.1h (homemade) but lightburn hasn’t let me down and I think defaults m4 at least on the code i exported to check
; LightBurn 0.9.24
; GRBL device profile, current position
; Bounds: X-2.97 Y-2.56 to X38.85 Y38.85
G00 G17 G40 G20 G54
; Cut @ 15 mm/sec, 100% power ------------------> Cut Settings
M8 ------------------>leaving air assist on like a dummy even though the plasma hands it
G0X-0.117Y-0.1009 -----> I think this is the move to the start position
G1 F100 S0 ---------->rapid move but no power
G4 P1 ---------> wait for it(suppose to be the dwell with power on)
G1 S0 -------> rapid with no power again
G0 ------> rapid with purposeful spindle off code I think
M4 -------> I think this is where it actually turns the plasma on now
; Layer C00
; return to starting pos
Any input would be appreciated
Thanks and sorry it was a long post