The shorter the focal length, the smaller the beam width and the narrower the kerf. I think you could use the 50 mm lens. There are 50mm, 75mm, and 100mm focal length lenses available. I like the 50 for cutting and engraving but that's just me. I think I can cut better and with less power than with the other lenses.
And as far as I know, unless this has been changed, say you want to cut a 4" x 4" square and you draw one up in Corel, save as an .ai file, and import it into LaserCut, the laser will cut right on the line and you will end up with a square smaller than 4". So you have to allow for that and make the square maybe 4.006 x 4.006. It really depends on what you are doing and what the tolerances are. You can add an offset to your file in LaserCut, but it's in metric and It's easier for me to make the changes in inches in Corel if needed.
I looked up the size of your machine and according to them, it is 67 3/4" x 47 5/8" x 42 1/8". I hope you meant a standard size GARAGE DOOR.... I'm pretty sure you can unbolt the top of the machine with the lid and remove that without too much trouble. And unbolt the wheels on the bottom. That might allow you to turn the machine on its side and fit it through the door. I can measure mine tomorrow to see if that would work. I think your machine is the same height as mine. Is that a 36" wide door you have to fit it through?
The Baltic Birch plywood cuts fairly well. I've had good luck with the 1/8" and 1/4" from Lowes. You'll just have to get some and try it. I also like cutting their 1/4" hardwood slabs. I make boxes from them and they cut real nice.
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