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K40 Mini Gerbil not firing

Hi All,

Not sure if this is the right place to be asking this, but I have recently received a Gerbil controller for my K40. I believe this is a kickstarter model that is arduino based

Can anyone give me some information on this board?

I have the X and Y Axis moving successfully, but it will not fire.

Sample Lightburn GCode

; LightBurn 0.9.07
; GRBL-M3 (1.1e or earlier) device profile, absolute coords
G00 G17 G40 G21 G54
G90
; Cut @ 100 mm/sec, 20% power
M8
M5
G0X2.98Y3.68
M3
G1Y67.68S409.6F6000
G1X86.98
G1Y3.68
G1X2.98
M5
M9
G1S0
G90
; return to user-defined finish pos
G0 X0 Y0
M2

Settings from the controller

$$
$0=10
$1=255
$2=0
$3=0
$4=0
$5=1
$6=0
$10=31
$11=0.010
$12=0.002
$13=0
$20=0
$21=0
$22=1
$23=3
$24=600.000
$25=1000.000
$26=250
$27=2.500
$28=0.000
$30=2048
$31=5
$32=1
$100=160.000
$101=160.000
$102=250.000
$110=10000.000
$111=10000.000
$112=500.000
$120=3000.000
$121=3000.000
$122=10.000
$130=320.000
$131=230.000
$132=200.000

Uploaded files:
  • image1.jpeg

Hi, this is the legacy Gerbil which will work as well. You need to debug the firing by setting the controller in cnc mode. Just send a $32=0 to the controller via a G-code sender or LightBurn (download a trial version). This allows you to fire the laser without motion (laser mode $32=1 is a safety feature). To enable firing you need the LP and WP connected to Ground (GND) and LO needs to pulled to Ground via the Gerbil (via command M3 or M4, M5 releases LO). If these are satisfied then any S command e.g. S300 will fire the laser.

in a nut shell:

$32=0

M3

S300

M5

and restore to $32=1 when it all works. Use a multimeter to test the LO signal. Often a bad connection is the culprit and reseat the BIG connector on the Gerbil.

Cheers, Paul awesome.tech

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