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is M3 command working?

I am using Gerbil + K40 with Lightburn. Lightburn generates code for Gerbil using M4 command, and it makes the laser beam not appear at the very beginning of a cut because the speed is not high enough yet.

I have tried M3 command with my machine but cant turn the laser beam on

So is M3 disabled in Gerbil? And any way to fix the above problem?

Thanks

 

PS: The first attached photo is a rectangle cut in Lightburn. The second photo is the result when I got four separate lines instead of one closed rectangle

Uploaded files:
  • 20190112_194804-Medium.jpg
  • 20190112_194843-Medium.jpg

If you want to use M3 you should set $32=0

 

My understanding is that setting $32=1 enables the laser mode, and in the laser mode we will have M3 and M4 commands.

I have tried setting $32 =0 and it work OK except that it does not stop the beam when moving from cut to cut, i.e. just like a CNC does not stop its spindle between cuts

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