Optimizing cut paths

I am trying to cut 1/2" thick acrylic 8+ Columns by 8+ rows - all are with no offset. so using the remove overlapping lines toggle. The erratic path it takes causes multiple pieces to not cut in order thus parts fall before they have been cut. I have tried grouping cuts, same issue.

I just want it to start at one corner and cut piece one, move down make two cuts, move down make two cuts, then reverse up the next column. HELLLLPPPP

Please share your file for folks to review, we can offer adjustment to your working design. :slight_smile:

For a good overview of the LightBurn ‘Cut Planner’ and how to adjust to produce as you’d like, this is worth review,

cut path issue.lbrn2 (43.8 KB)

Here is the file.

I have watched this and several others, it does not solve the issue. The cut optimizing routine is doing things that don’t make sense with such a simple set of objects. Some objects fall before they have been cut properly. Even cutting two columns from bottom to top - causes the last item to fall before it is cut.

Cutting one column should complete before the next is started, the remove overlapping lines seems to modify the behavior, I have tried to make each column a group and still see erratic cutting, parts fall before they are cut - as in the above.

What Cut Optimizations do you have set, and how did you make these shapes?

I drew a 40mm x 20mm rectangle, selected it and use ‘Grid / Array’ to create a 10 x 2 array of that rectangle. I did not group anything. I show this below, with ‘Preview’ showing the exact output I think you are after using the Cut Optimizations shown.

I set up exactly the optimization you had but a 2 Column by 33 Piece group, it seemed to be working fine till this screen shot. Where the target is + that one large piece falls. This is what I am seeing when it cuts, software makes wierd choices.
Attached is the file I cut from.
2.3 Standoff v3.lbrn (979.7 KB)

I just ran the whole attached file 12 columns x 33 rows and it cuts correctly, SMH. So not sure what to say at this point.

At this time, the ‘Remove overlapping lines’ in ‘Optimization Settings’ isn’t smart enough to figure out that some of the missing lines might cause a section to fall out. In speaking with Oz about this, we actually want to make a “smart grid detector” that notices patterns like this and runs it, removing the appropriate overlaps, but making sure to do it fully top down / left to right so nothing drops, but that work has not started.

For now, this workflow should produce what you are after.

  • select all rectangles
  • break apart
  • delete duplicates
  • then join just the outer lines, leaving the inside ones distinct
    It’ll cut the outer ones last if you do it that way.

But, I notice the current file you share has issues that are going to make this flow difficult until corrected. See below, this is happening in several places in that file.

Quick tip - I would use the ‘Grid / Array’ tool to create the columns and rows, so they are aligned correctly when generated. Modifier Tool - LightBurn Software Documentation

I must have added a few rows to that, I almost always use the grid array. I am always adding or subtracting ad the material size warrants. I will fix this version. I do lots of these types of parts and made my own workarounds, This one just bugs me at a visceral level each time I encounter it.

Thanks for the info

Awesome, we love hearing about this. Please share, as we always enjoy understanding how folks do the things. :wink:

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