I am making this large, wall hanging wine cabinet/rack (not with the glowforge). Well, my forstner bit jumped out of the hole that I was drilling by hand and really marred/chewed up the surface of the last piece of plywood I had on hand to build this thing.
After talking to a friend, he suggested just cutting out a ring on the Glowforge and glueing it around that particular hole as an accent. So, that’s what I was modeling last night.
I went over to Inkscape and started with the circle that I needed to match the diameter of the drilled hole. It was 2.0025" on my calipers.
I input the dimensions in Inkscape. Then, I duplicated and told that new circle to be 2.252" (which should be 1/4" larger than the first one I drew, right?). I cut that out, and the first circle matches what I measured with the calipers, but the outer ring does not. There was not a 1/4" gap between the inner and outer ring. Why?
So, I tried again…this time, making the outer circle 2.502". That should make it 1/2" larger than the inside circle. Again, I get it out of the Glowforge and well, you can see for yourself what it measured as from this photo:
Why is that not measuring 1/2"? Is all of that difference because of laser kerf?