steve rost wrote on Nov 27
th, 2013 at 9:17am:
Thumbs Up What John Heyd said. I have said it many times before in this forum. I am not into 1/4 or1/2 rings. Your ring will be slightly elliptical. Work for accuracy.
I agree with that to a point. I try to be as accurate as possible, but it doesn't always work out that way.
A word of caution, depending on how much is need to be trimmed or sanded away, this can effect alignment between layers, since some segments are now shorter than others.
If possible, try some test cuts with less expensive wood to dial in the angles. Assemble and check 1/4 or 1/2 rings for accuracy. You should be able to tell if your settings are good with a 1/4 ring. If your angles seem off a bit, adjust now before cutting the entire ring from more expensive woods.
Once you are satisfied with these settings, save them somehow. I like to leave my saw alone until I'm done the whole project, but sometimes this just isn't possible. Write down you settings, cut and mark templates at standard cutting angles, 22.5, 30, etc. This will make it much easier and faster in the future. This can be a bit time consuming but you should only need to do it once.
If it's not possible to glue everything at once, you should only need a small amount of touch-up sanding to achieve a tight fit.