yep I have also tried to control the Laser via my buisness Notebook and I have tried to control it with the Laser GBRL software. But alle these options showed the same result.
I've checked all the connection cables+the power supply+the USB cable; all work fine.
So in my eyes there's only the Arduino/Servo modules/main circuit board responsible for this error.
All the visible solder joints are good.
Thanks, i will look into it. But it is about every 5 centimeters. For 5 centimeters all is going well and then it jumps a few millimeters beside and that is going on to the hole picture. It´s weird. Anyway, thanks for your reaction.
Mine just did something similar, it was working less than 30 minutes and then it would not burn. Laser is on, but much weaker. The test button does nothing and the laser beam itself seems rather distorted now. I just got this today and was working great before. I emailed banggood and waiting on a response.
I hooked mine up directly to 12v and it did the same as using the software.
As a control, try a different font. I have had this issue with some fonts. If a different font doesn't fix it, recheck your belts and wheels.
I was always able to move my machine manually and get correct distances when my wheels were going bad but when I did a burn like what you posted (letters and whatnot), that was when I would see my machine fail. You could also try reducing the acceleration to see if that helps.
@Josephus The link ThothLoki posted above, or you can search for "A4988 adjust current". You put the DC volt meter from the wiper to GND and set 0.3V for X and 0.6V for Y. It's OK to go a little higher (0.7V) but it shouldn't be needed if the belts and wheels are setup correctly.
The drivers are rated for 1A (0.8V ref) without a heatsink and fan.
Thank you for your detailed explanation. The last paragraph really makes it clear to me how that thing really works between the 8 bit processor and the 255 step limitation. Good job and much appreciate the time you took to share that understanding.