K50 fires too late and ends too early while engraving

[RHO (Rainer Hoermann)]

Dear all,

I’ve an issue with our K50 laser (classical 50W CO2 with Ruida controller RDC6442 S-B (EC) and MYJG50W power supply):

when engraving (fill), the laser starts too late and stops too early. Very easy to see when the outline is lasered as line and the inside is done as fill.
The gap at the beginning and the end is changing a little bit with speed and is about 0,5-1,0mm. It gets better with more power, but is still present.
Therefore narrow vertical lines are often not lasered at all, or just a little bit. Good also to see when I’m engraving a ring with a line of 2mm → top and bottom shows really 2mm line width, left and right the line widht is smaller, see e.g. this picture:

I checked the forum and found some similar issues here, but unfortunatelly no solution or final conclusion. Here are the links and the users which created the topic:

@Tysondiaz

Replaced power supply now files seem to be corrupt

So I was thinking maybe my stepper motor was not set up right and that was causing the short lines but I just checked all the measurements and its spot on. I also blew up the test and it seems to have better talorance idk. [20200525_090922] Once again I want to thank everyone for helping and sharing your knowledge. Its not fixed but you guys at least give me a little hope I can get it fixed so thank you.

@Wolfgang1us

Fill and Line do not match

Hi, Please help. I am using a 50w ruida laser blue and white machine. All axis are calibrated and I created a 10x10mm square. Min and max power are set to 15%, speed to 400mm/s. All I do is set the layer to line, sqare is sqared and 10x10. If I set the same layer to fill at 0° scan angle, height is ok, width is too small. If I set the scan agle to 90° width is ok but height is to small. Using offset fill, it is sqared but it burns all the way through at the same 15% power setting. See attac…

Maybe one of you has found a solution in the meantime??? I’ll put the links of the other topics in the next post.

I played a lot with scan adjustment and initial offset, here are my values (all now without initial offset):

And my machine settings:

Here are some pictures of a rectangle with different speeds and an initial offset of 0mm. The problem stays: it starts too late and stops too early.

Initial offset 0mm:

I know the line shift is definitive not perfect (especially at higher speeds), this adjustment ist still pending.

I’ll post the other pictures in the next post.

I thought already about something with the power supply and tried several things without any improvement. Maybe somebody could share a wiring diagram for my Ruida Controller and Power Supply.

Any suggestions from you guys? Would be greatly appreciated…

BR,
Rainer

[RHO (Rainer Hoermann)]

Here are the other users and their links to the similar issues (was not allowed to put more in just 1 post):

@bummer

Problem with Overscanning but no ability to adjust

I posted on FB New to Laser Engraving but didn’t get an answer. My engraving goes outside of my boundary lines and someone suggested running the Scanning Offset Adjustment, which I did and it helped. But as you can see from the photo, even though my lines are now even, the laser seems to be firing too early and ending too late to have the engrave stay within the limits of the object boundary. I asked on FB if there was a setting that could tell the laser to delay starting the engrave and to e…

@Purdon

Trouble after setting scanning offset adjustment

Hi new to lasers have just got a Chinese laser trying to go through all the calibration and set up I have been trying to do the scanning offset adjustment I can get it so lines are perfectly lined up on x axis but then the scan lines start late Finnish early in comparison to the line around outside [image] [image] [image]

And also here the other pictures with different initial offsets:

Initial offset -0mm:

Initial offset +0,5mm:

Sorry for splitting the info in to posts, but that was due to the restriction of bloody beginners (like me) in the lightburn forum

BR,
Rainer

[Wolfgang1us (Wolfgang)]

Good morning,

was the laser working before or is it a new one? Please also post the complete vendor settings, thank you.

Best regards,
Wolfgang.