I use a round-over bit with bearing pilot. The radius of the bit must be less than 1/2 the thickness of the material, or the bearing won't ride on the original surface when you round over the second side. Adjust the depth of the bit so that you get a round over without a ledge at the top surface. For internal cuts, you'll move the router in a clockwise direction to avoid the bit grabbing.
Rounding off an internal hole
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+1 what they said.
Think about it for a minute. If the material is 3/4 inch thick, a 3/8 inch round over bit will make a smooth edge. When run on both sides of the material, it will create a rounded edge because the cutter will meet from the other side. Or just do one side only, your choice.
A 1/4 inch roundover bit will also make a rounded edge that takes off the sharp edge wlhere you cut your opening.
Practice on some scrap. Adjust your cutting depth so the pilot bearing rides against your material, and the cut creates the rounded over edge you are looking for. You might have to adjust the depth up or down to get it right. Then all that is left is some light sanding. Should come out looking good.
BTW, round-over bits get used a lot in the wood shop.
Good luck.
Mike
Think about it for a minute. If the material is 3/4 inch thick, a 3/8 inch round over bit will make a smooth edge. When run on both sides of the material, it will create a rounded edge because the cutter will meet from the other side. Or just do one side only, your choice.
A 1/4 inch roundover bit will also make a rounded edge that takes off the sharp edge wlhere you cut your opening.
Practice on some scrap. Adjust your cutting depth so the pilot bearing rides against your material, and the cut creates the rounded over edge you are looking for. You might have to adjust the depth up or down to get it right. Then all that is left is some light sanding. Should come out looking good.
BTW, round-over bits get used a lot in the wood shop.
Good luck.
Mike
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It took a while, but I did the round-over on my work benches. I think I used a 1/8th inch bit. I can't recall. That was several moons ago! :surprise::grin:
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These were done with a 1/2 inch roundover......
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