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Missing engrave lines on china blue 3050

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Laser
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2023-08-09

Hello,
I hope i will get help about my problem which im having almost a year… so when engraving - i get missing lines of fill. No matter how power or speed i do. If you would closely look to engravings you can see that some lines are not enough power to engrave, but they are. So engraving is inconsistent. I’m tried this on leather, stamp rubber and plywood as i do these the most. Everywhere sometimes happens not power enough engraved lines. (And its not the grain of plywood).


And second problem is that when starting to engrave - few lines are engraved on the same spot at the start. I can fix it by draving a smal object like circle before the fill figure to engrave on 0% power. Then the engrave lines not overlap at the beggining. But the most problem is inconsistent engraving. Attached images. Seems i have cheecked everything from hardware like belt tension, beam allignment, all connections etc… but cant trace the problem for a long time. Please help.

 

Attached lightburn interval test on plywood and rubber.

C

    • Liam

      2023-08-10
      "few lines are engraved on the same spot at the start. I can fix it by draving a smal object like circle before the fill figure to engrave on 0% power. Then the engrave lines not overlap at the beggining."
This is certainly Mechanical backlash. This can be confirmed by engraving a circle and seeing the gap. It’s most likely something is loose. Please test the motor belt drive sprocket with an Allen Key or hex key to confirm that the screws are tight.

With the amount of observed flattening in the Leading Zero in your engraving (after the traverse), this may be the cause of the inconsistent engraving. With the laser un-powered, physically move the engrave head 1mm left right and attempt to locate the cause of the looseness.

One of the idlers could have come loose and caused the drive belt tension to be lost.

The other thing that will behave like a backlash behavior is if the rail where the engrave head travels on the Gantry is sticking. I was told to keep the gantry clean and use sewing machine oil to ensure that the machine moves freely.
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