Good morning,
I have been having issues with files and have needed to convert everything to a bitmap to get it to work well (I am running an Ortur H10 10w diode laser). When I frame a project with the rectangle tool the code often causes the laser to cut as a repeated line rather than doing the rectangle. This occurs about 80% of the time and makes it difficult to line up my projects well as I do not have a camera setup. The other issue is random stops in the code and I get message “G-code locked out during alarm or jog state.
error:9” slowing down the laser seems to help reduce this error but it can be a pain when I have to restart the engraving and it isn’t always 100% lined up from where it was on the first try. This causes doubled lines or fuzzy letters. Any help with settings or modes to fix this would be greatly appreciated.
Without an image of the problem, I am going to attack this as a communications problem.
- All of a suden or gradually getting worse?
- Have you changed any of the GRBL parameters?
- Does your USB have ferrite supressor (big knot) on it?
The usb cable does not have a ferrite suppressor on it. I will locate one with a suppressor and see if that helps. As far as an image of the error I did not take a picture but the rectangle issue manifests as a simple line burnt over and over along the lower extent of the project. The sudden stopping occurs at random and typically during the first third of the code. my laser has repeatability issues (probably need to tighten belts or reduce speed) and has trouble restarting the engraving in exactly the same path as previous passes. I have noticed that these lasers really jerk when they are running at higher speeds and may be prone to causing whiplash artifacts. I would be interested to also know if lightburn can integrate a slow down prior to suddenly changing directions. I see a lot of others with issues on corners and for 3D printers setting up software and firmware to have microsteps rather than full steps improves print quality and the noise of the printer.
This is a common problem and no easy solution. If you have have mechanical issues like backlash, there is no hope no matter what you try.
That feature is entirely in the GRBL controller. Lightburn has the Constant Power switch for the laser output, but the motion control wouls be by lowering the $120 and $121 accel values to give it a softer start and stop. Another trick is to not run it Warp 8.
This is exactly correct.
The GCode controller does the motion planning based on its acceleration settings. DSP machines also have a rate of acceleration setting called ‘jerk’.
F=m*a 
The force that causes the machine to deflect or slip is directly related to the mass and the acceleration. The acceleration is the easiest to change but I’m sure we’ll see lightening holes in gantry hardware because some enthusiastic folks insist on maximizing acceleration.
Hahaha! Should have kept that to yourself…