I have been trying to cut a piece of material longer than my bed size without success. I am fairly new to laser cutting but I am successfully cutting many parts that fit on my cutting bed. I am running Lightburn Version 9.24 on a Windows 10 machine. My laser cutter is a Boss Laser LS-2440 150 Watt with a Ruida 644xs Controller. I have watched the youtube video that cuts the mermaid no less than 8 times trying to find any details that I have missed.
I am trying to cut a part that is basically 72 by 1.25 inches.
I have logically created 2 parts with the following steps:
- I loaded my original part.
- Created a box on the same layer as my part and it is around my part and the size of the box is 72.44 by 1.88 inches so it surrounds my part completely.
- I grouped my part and the box around it together.
- Next I created two boxes on a different layer that are 36.22 by 1.88 size. Half the size of the original box
- I over laid these two boxes on top of the box that is around my part. I snapped them in the corners.
- The finished view is these two smaller boxes completely cover the larger box around my part.
- I created a circle that is .275 inches, put a vertical and horizontal line in the circle and grouped them together. I then put the circle on another new layer. I then copied the circle so now I have 2 circles
- I moved both circles to the middle of my part where the two smaller boxes join together and snapped them to the smaller boxes accordingly. I did move them in about a 1.4 of an inch from the edge so they would cut on the material. I set the cutter so it would only engrave these circles for reference.
- Next I selected one of the smaller over laid boxes and selected my actual cut part and then went to cut shapes and the smaller box dis-appeared. I then went to the other smaller box and repeated this process. It also dis-appeared.
- I then save my work to a file and then saved it two more times as filename1 and filename2.
- I opened filename1 and deleted one half of the drawing which gave me half of my cut.
- I opened filename2 and deleted the opposite half of the drawing which gave me the other half of my cut.
- Both of my files have the registration circles in them.
- I sent the first file to my cutter and it prints just fine with the registration circles.
- I then open the second file in Lightburn. I move my material in my cutter to get ready for the next half and jog my cutter to the center of the first registration circle and then select my first registration circle and then select “print and cut” and then I select “set first target position”.
- I then jog my cutter to the second registration circle and then select “print and cut” and then I select “set second target position”.
- My start from location has changed to “Absolute Coords”. I saved the file in Lightburn. I then send the file over to the laser cutter.
- I start the laser cutter. The first thing it is does is engrave the registration circles over the top of the original set. Then it begins to cut my part.
- The reprint of the registration circles are about .03 inches off from the first set of circles.
- My part gets cut out but the the overall length is at least .25 inches longer than my original drawing which is not good since the part I am trying to print has other interlocking components that need to have the notches in a specific location.
- The first half of my cut is correct in length but the second is not correct. I have noticed in my part where I have notches being cut that as the cutter goes down the cut the notches progressively get further off.
- I can print 36 inch parts that come out at 36 inches repeatedly so I think my cutter is accurate.
- I believe my problem lies in the process of joining my two files together with the registration circles but for the life of me I do know where the problem lies.
I am attaching the following files for reference:
- girder-innerwall-72.lbrn2 = the original part to be cut
- girder-innerwall-72-sheet.lbrn2 = the original part plus the two smaller cut boxes and the registration circles.
- girder-innerwall-72-sheet-1.lbrn2 = the first half of the part
- girder-innerwall-72-sheet-2.lbrn2 = the second half of the part
If anyone has any insight it would be helpful. At this point I am making a lot of expensive firewood.