Need some roundover bit input
I've got a project I'm designing that will require a roundover bit. Have never used a roundover bit, so want some advice before I buy anything. I will be rounding 1/2" plywood, which I know may splinter; and no, I will not be using any wood but plywood. I will be gluing two pieces of 1/2" plywood together, with a flat edge, then rounding over what will be the top of the piece, with my in-table router - will flip it after routing. I want a fillet, as show in the picture. Not sure yet if I want the fillet 1/8" or close to 1/16" yet. I would like a 1/2" radius, and need a 1/4" shank - heck, if I could get away with it, I would actually prefer 3/4" or 1", but don't see that happening with a 1/4" shank. But, I have been researching on-line and read that 3/8" radius, and above, required a 1/2" shank. And, I read that 1/2" radius, with a 1/4" shank is perfectly fine. Typical on-line advice. I am not sure that the people writing this had actually done it or not.
I want just the one layer rounded, with fillet, and prefer the second layer not be rounded. However, I would prefer the 1/2" radius, so can accept a bit of rounding on the second layer, after all they will be solidly glued together, so no biggie. But I can live with the 3/8" radius if need be. My questions are:
Can I safely use the 1/2" radius bit, with 1/4" shaft, realizing that I may have to make very small cuts
Or, should I go with 3/8" radius instead?
Or, will I have to bite the bullet, and have to settle with 1/4" radius?
Forgot to say, I normally use just a 1/2" flush trim bit, 1/4" shank, in my table mounted router, and have no problems with that.
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Last edited by JOAT; 01-15-2018 at 11:27 PM.