Hi. I am contemplating changing over to Gcode for my laser instead of DSP. I have had a look in the Lightburn software and cannot see how to reduce power when it comes to a corner to stop the corner burning. Is there a setting for this, or is it done automatically in Lightburn. If it is done automatically can the power be changed or is it fixed minimum power
IMHO, what a disastrous idea…
I don’t think most grbl controllers can handle that in the firmware.
The best tip is if it’s not in the Lightburn menu it’s probably not available.
What makes you partial about gcode? Just curious. I’ve used both, DSP for a laser.
Good luck…
The reason behind thinking about changing to gcode is recently i changed out the steppers for Clearpath SDSK sevo motors. When cutting a circle there is a lump at about 1o’clock and 7o’clock. I tried changing settings and cannot get rid of the lumps. Teknic, who sell the Clearpath servo’s, connected remotely to my laser and ran some tests. Using the scope they were able to see that the servo’s were exactly following the commands given by the controller, Ruida 6442S. They could see definite spikes where the problems were. They concluded that it was the controller giving the issues. Tried a Trocen AWC708C controller with identical results. They said the original steppers were just blundering through the spikes. None of this made sense to me. That was why i was contemplating going over to a gcode control system
This is available in GRBL controllers from version 1.1f and newer. The changes there allow for variable power to accommodate acceleration/deceleration and use G-code M4 command vs M3.
This is not a function of LightBurn… as-in LightBurn does not manage the power variability. It only need use M4 instead of M3, which it does, for this to work.
Whether or not this is a good idea to switch controllers is a separate concern. I guess the alternative according to the stepper manufacturer is to just get crappier steppers?
Sounds fishy to me. Especially at 180 deg repetition. That doesn’t sound like the controller could be doing that. Seems like you proved it by swapping out the controllers to a different manufacturer.
However, I’ve been out of the field way too long to know how they are handling it today. Technology seems to change faster than Moore’s law predicted.
In the future, you might add you’re using servos to the title. There are some here doing that or using the stepper feedback type. Might draw more interest… I would think, hope.
I found them too expensive to even think about for my applications.
Back a ‘half century’, my first experience was with servo cnc wire wrap machines. I’m sure they’ve come a long way… Ours were not a couple hundred bucks each…
Take care, good luck.
Keep us updated.
I have now changed back to the Leadshine Easy Servo motors which are a cross between steppers and servo motors. They have a 1000 line encoder on the back of them, closed loop. Teknic has agreed to give me a refund if i return the servo’s to them. When i changed back the issue dissappeared
Those where what I was referring. Sounds like you have it worked out…
Might want to mark it solved…
Good luck
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