So my $110/$111 have to be set to 1500 (My machine defualt) to get the results I expect.
I raised my $110/$111 to 3000 and toled LB to go at a speed of 3000 but as you say it seems to cut the power in half. This means I can’t overwrite this max speed of 1500, is this some form of built in or hardware setting?
Thanks for your help on all this, it really makes this hobby much more pleasent for me and helps keep my motivation up!
What are your $100 and $101 settings? If they’re quite high (800 or more) that would be the reason. 8-bit GRBL is only capable of sending motor steps at a max of 30,000 per second.
If you have a machine that requires 800 steps to move 1mm, that would mean you couldn’t move the machine faster than 37.5mm/sec (2250 mm/min) before GRBL simply locked up, incapable of sending more pulses. If the machine uses 1600 steps per mm, as some do, that cuts that maximum in half.
If your steps/mm are 400, then yes, you should be able to go the speed you’re saying.
Your accelerations are set pretty low - that number is mm/sec per second, so it will take your machine two seconds to accelerate to 100mm/sec.
Were you burning an image, or do you mean this was just a filled rectangle? I would expect that to work, and be no different than in LaserGRBL, though the acceleration being low means that in ‘Variable Power’ mode may start with less power until it gets up to speed. (LightBurn uses variable power mode by default) . Increasing the acceleration might help.
For speed, the 3000 you had originally is likely fine. For acceleration, start by just doubling the numbers you have and try that. Keep doing that until it fails (skips), then back off to the last one that worked.