adlnyc
November 15, 2019, 1:56am
1
First I must congratulate you for developing such a nice GUI for LB.
I am migrating to LB because I am getting a Macbook. I tested a photo for engraving on both; lasergrbl and LB.
I hope you can help with some initial hiccups.
I am running both the apps at 800mm/min and somehow with the same line resolution LB is slower by about 33%.
When using LB I have random space between lines on the X axis. There is a noticeable thud sound when X axis/laser shifts to the next line.
I am using a good quality DIY laser engraver hooked up with an Arduino on GRBL.
I too moved to Mac just an obvious thing is your Nano flashed to 1.1e or higher, i found as soon as i changed the nano firmware things got a lot better, i dont know whether it will help but who knows.
you can use a trial version of T2 to flash if you still have a windows machine or download the arduino control software.
adlnyc
November 15, 2019, 6:29pm
3
I have already flashed my arduino with 1.1f but that doesn’t change anything.
800mm/min is only 13.3mm/sec, so that’s not terribly fast. When you say “running at the same line resolution” - what resolution is that?
LightBurn resamples images so the DPI you specify is used for both horizontal and vertical. You have not specified if you are using grayscale or dither, or anything else about the settings used for the image, or information about your machine, like size, speeds, firmware version, etc. Supplying that information would allow us to offer better help.
adlnyc
November 15, 2019, 9:00pm
5
My laser is 2.5W so I can’t go any faster then 800mm/sec to get a decent burn. The cutting area dimensions are 15x20 inches and firmware is GRBL 1.1f on arduino.
I am using dither Jarvis 800mm/sec .2mm line interval.
I can visually see that lasergrbl makes the laser move faster compared to LB. Both apps set at 800mm/sec.
Speed is a secondary issue. The main problem is that there are random missing lines on Y axis. I have observed that this happens when Y moves to next line and I can hear a thud sound from the two stepper motors.
I feel the steppers motors turn more aggressively when connected to LB. I am not having this problem with lasergrbl.
It’s all just GCode. Make a small square and generate the GCode from LaserGrbl, and do the same for LightBurn. Post both as text files and we can look for what’s different.
adlnyc
November 15, 2019, 10:37pm
7
I cant create a square in lasergrbl so I created an image with a square and vectorized it in the app.
Lasergrbl
LB
You said it’s missing random lines on the Y axis in LightBurn, so you’ll need to do a small filled square so we can see if there are differences in the settings there. I assume it’s filled shapes, not outlines, that are the problem for you?
adlnyc
November 17, 2019, 2:41am
9
Here is the Gcode:
LB:
; LightBurn 0.9.07
LaserGRBL:
The biggest difference I see is that you’re using a line interval (pixel size) of 0.333mm in LaserGrbl, and 0.2mm in LightBurn. That means the dots in LaserGrbl are over 50% larger, and therefore the GCode will be considerably less dense, and less likely to choke the 8-bit controller.
You’re also using Variable Power mode in LightBurn (GRBL driver) and Constant Power in LaserGrbl (the equivalent of GRBL-M3 in LightBurn), but that shouldn’t affect much here.
adlnyc
November 17, 2019, 5:25am
11
I am doing this so because I am getting similar results for this size dot in “these” configurations. If I go any higher I am getting dots as straight lines.
I feel it’s compatibility issues because lasergrbl is using .net who knows!!
LB is supposed to be a solution for DIY laser engravers but I see differences.
system
December 17, 2019, 5:25am
12
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