1/8 " is expressed in decimals, so it would be .125". All of the thicknesses are in decimals. As jbpa said, always measure your materials. There’s a bit more leeway with that when you’re using Proofgrade, but even then you can’t assume.
Secondary question, when I change material thickness from default 3 to .125 (I haven’t actually measured yet, I’m still looking at what different changes do to the file) suddenly the tabs get many and tiny…
Oh! Okay, the burn makes a lot of sense. As I adjust it I see the lines get thicker or thinner and that makes sense. So say if I wanted the top to fit on looser, I would make the lines in that area/those connectors thinner?
Next question, why does it have more/less or bigger/smaller tabs based on material thickness? Does it change that for a specific reason like structural stability?
I don’t fine measure my items. Most of my materials are 1/8inch, which is in the ballpark of 3mm so I never change that. I leave the burn alone as well. The fit is tight and seems like it won’t go together, but it does. This is for wood/MDF.
just to make sure things are clear, here, you won’t get that pattern straight out of the box making program. you’ll get a regular pattern of those small fingers and you’ll need to edit the SVG in a vector editing program to remove the ones you don’t want and make those lines straight on both edges of the box.
but what david did is a very nice job of taking the finger joints to the next level of design.
one other thing to mention with the “burn” setting. as you go forward, you may want to test some simple joints in new materials. every material will have a different kerf (the amount of material burned away). i’ve found that the default there (.1mm) works really well for me for .125" baltic birch. it requires just a little bit of work with a rubber mallet to get the sides together for a perfect friction fit, no glue required.