@Arion_McCartney I think you made your motherday engrave with GRBL and Laserweb4. I’m new on LW4 and my laser dont wont to switch on 
Maybe its possible to send me your Machine Profile Setting from Laserweb, just this json hash? Many thanks.
@Jim_Fong Now, that’s what I call a realy nice machine and a decent speed!
@cprezzi thanks, start of a 3d printer (400mm X 450mm) but also to see how good corexy can be. I have the extrusion and linear rails for a much larger 800mm X 1000mm (approximate) size build for a laser. I’m thinking of making it also corexy instead of standard Cartesian kinematics. I don’t know of anyone who has a large size corexy laser. Corexy is much simpler to build for me. I also have some high performance brushless servo motors/drivers to run this larger version so it will be very fast. Laser Tube and power supply will come from my K40 laser which is currently running Cohesion3d Smoothie/Laserweb4
Lots of hardware testing before I decide which way to build the laser. That is why I wanted to get CoreXY grbl-lpc up and running.
I have 4 CNC’s (one is a lathe) so machining any parts out of aluminum for the build is easy.
Any advice will be greatly appreciated.
@Frank_Herrmann Here you go. I hope you get it running!
https://drive.google.com/file/d/0B3A9wmWsyWK1Rm5sXzU5by1LeFk/view?usp=sharing
@Arion_McCartney Ran into the M2 problem too while testing. Seems to set grbl offset value (whatever you have set prior)
I removed M2 at the end of the file. It wasn’t a nice sound slamming the carriage at 1000mm/sec!!! I set the max G0 speed much lower after that…
I have removed M2 from the default settings @ initialize as it is anyways not needed.
Stress testing grbl-lpc and Laserweb4
This is a 300mm diameter circle made up of strictly g1 moves, 866 lines of gcode for one complete revolution.
900mm/sec!!!
It takes 13seconds to run 7800 lines of gcode or about 600 lines per second. I’m Amazed…I’m not sure what the upper limit is. I can’t run these steppers to much faster than this without stalling. This is the limit of the stepper motors torque and not grbl-lpc/laserweb4.
Thank you for the great work!!!
For those interested
55,000mm/min (916mm/sec)
45,800 step pulses/sec
Motor is spinning at 1375rpm
@Arion_McCartney which profile you use in the most case? “3” or “new” or “k40” for grbl-lpc?
@Frank_Herrmann Whoops, looks like i need to clean the profiles up LOL. Use 3, that is what I am using.
@Arion_McCartney Many thanks, i will try ur settings today
Hello All,
ok here is my Firmware that fit perfect to an c3d mini and a K40 Board. This means, all needed Settings are default in this firmware and it’s not necessary to configure this grbl-lpc firmware. Put the binary Firmware file to an SD Card, plug in c3d mini and start ur K40 CO2 Laser. Then connect via Laserweb4 and add just M4 at start gcode and M5 to end gcode. Thats all.
Thanks to @cprezzi and @Arion_McCartney .
https://github.com/xpix/grbl-LPC/blob/feat/laserk40_c3dmini/build/firmware.bin?raw=true
I used the seeting from @Arion_McCartney :
$0=10
$1=255
$2=0
$3=3
$4=0
$5=1
$6=0
$10=0
$11=0.010
$12=0.002
$13=0
$20=0
$21=0
$22=1
$23=1
$24=50.000
$25=6000.000
$26=250
$27=2.000
$30=1000
$31=0
$32=1
$33=5000
$100=160.000
$101=160.000
$102=160.000
$110=24000.000
$111=24000.000
$112=24000.000
$120=2500.000
$121=2500.000
$122=2500.000
$130=300.000
$131=200.000
If you found some problems with this settings on ur K40, please send me a message.
@Frank_Herrmann Cool! Is this firmware for the optical endstops (NO) or the mechanical once (NC)? Both types are used on different K40.
Ahh, ok thats only for optical endstops.
But can you try ur mechanical with this firmware, but as far as i remember you have to configure this.
@cprezzi You was able to test the Firmware binary?
@Frank_Herrmann Sorry, I don’t have time right now and my machine is working so nicely that I don’t want to fiddle around at the moment.
+Peter van der Walt documentation for what exactly?
Ah. There is my Troubleshooting page, I can add it there: https://cohesion3d.freshdesk.com/solution/articles/5000734038-troubleshooting-faq
+Peter van der Walt I have startet a grbl-LPC documentation on http://cncpro.co/index.php/65-documentation/initial-configuration/firmware/grbl-lpc-1-1e
@Frank_Herrmann I have made some changes to grbl-LPC to get homing and soft limits working (we need to be in positive space). Could you please try this version from https://github.com/cprezzi/grbl-LPC/releases/tag/beta05-v1.1f. You should only need to set $5=0 for the optical endstopps.
I’ve just flashed my firmware to grbl-LPC and I’m having a couple of issues.
I cant get the machine to home using end stops - I’m pretty sure I just need to add the command into laserweb settings but I have no idea what command to use.
Secondly, I cant get the X axis to move. Y jogs fine but X makes a slight noise but doesnt move at all.
Its an sbase board (I know - I’m ashamed) on a K40. Smoothie FW worked fine BTW.
Where do i leave some beer money for the grbl-LPC guys?
Thanks.