Fill layer and line layer not aligned

LightBurn Software Questions
,
1

I have a shape that I duplicate and assign each identical shapes to 2 layers. The first layer I make a fill. The second layer I make a line.

I am wanting to mark the fill layer and engrave the line later, so that there is a border engraved around the shape.

For some reason the fill layer seems to be shifted down and to the right of the line layer. I am not sure why as the layers are perfectly aligned in the software.

One thing I noticed is that I believe this is only happening when I have the scan angle set to 45 on the fill layer.

Any ideas what causes this and how to correct?

2

Most likely caused by slop in your gantry, particularly if it’s more apparent at an angle. A fairly quick test is to run this file with optimizations turned off at your highest speed with just enough power to make a good mark on cardboard. Post a picture here for analysis.
BacklashTest.lbrn2 (184.4 KB)

Define later. Immediately after, or next week sometime. Have you touched the workpiece or turned the laser off and on again?

Not that what your doing is wrong, but the more common workflow is by using sub layers in the cut settings editor. You don’t need to create duplicate layers that way. Check out this doc.

1 Like
3

How big is the displacement? Can you attach a photo? So that your problem can be seen not in words.

4

Later meaning the next layer to process. All in the same run though no touching the piece or anything.

5

Displacement is about .5 mm right and down. I’ll try to post a picture later.

6

I think I found the problem, but not sure how to fix.

This is on stainless steel. I am trying to get the outline to be engraved so I am running it in focus, but the fill layer, I am trying to fill with a Z-mark Black, so 3mm out of focus. Looks like the farther distance for the out of focus, expands the size.

Any ideas on how to easily compensate for that?

7

Problem solved. I noticed that when I have my laser focused, the total work area is 110mm X 110mm, but when I defocus it for the Zmark black, the total work area expands to 112mm X 112mm.

So the fix to the solution is to scale the layer for the Zmark by a factor of 110/112 = 98.214%

In order for positioning to also not be affected, I created a Tool layer with a square of 110 X 110, then I selected the tool layer and the zmark layer, made sure the aspect ratio was locked, and then scaled it by 98.214%.

Now this layer aligns exactly with the other layers when run out of focus.

8

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.