Routing Bullnose on Inside of a Circle - Router Forums
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post #1 of 16 (permalink) Old 01-26-2014, 04:19 PM Thread Starter
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Default Routing Bullnose on Inside of a Circle

I'm trying to make a set of wooden gymnastics rings. The inner diameter is 8". The thickness of the stock is 1 1/4".

I have a 5/8 bearing guided roundover bit; however, I find that my reference edge is removed by the first pass, so that when I flip the piece over to rout the opposite edge, the second pass cuts too deeply. If I lower the bit (so as to keep the reference edge intact), then I don't get a true circle profile, but rather a flat spot along the centerline.

I also have a 1 1/4" bullnose bit that will cut the entire round profile in a single pass. This eliminates the flat spot or vanishing reference edge problems, above. The bullnose bit does not have a bearing to guide it, so I use the router table fence the rout the outside edge. Any suggestions as to how to rout the inside of the circle using the bullnose bit? I was thinking a round fence that matches the inside diameter of the circle with bullnose bit positioned through a hole in the circular fence so that the cutting edge protrudes a hair past the edge of the circular fence. Any suggestions would be most welcome. Thanks!
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post #2 of 16 (permalink) Old 01-26-2014, 04:28 PM
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Welcome to the forum

I would cut a circle template and use the round-over cutter with a guide bush.

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post #3 of 16 (permalink) Old 01-26-2014, 05:06 PM
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Originally Posted by jw2170 View Post
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i would cut a circle template and use the round-over cutter with a guide bush.
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post #4 of 16 (permalink) Old 01-26-2014, 05:12 PM
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Hello and welcome to the router forums Community.

I have use the round over bit for one side and put a little larger bearing on and route the other side not perfect but will sand to round

Looking forward to your participation.
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Thank You John

Last edited by Semipro; 01-26-2014 at 06:33 PM.
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post #5 of 16 (permalink) Old 01-26-2014, 05:38 PM
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Welcome to the forum.

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post #6 of 16 (permalink) Old 01-27-2014, 01:40 AM
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Another option is to put a bearing on the shaft of the bullnose bit with a lock collar to hold it in place. Then you can attach a circle template to the ring. It would be nice to find a bearing that is the diameter of the bit in the centre of the concave but you can adjust the size of the template to make up for one that isn't the right size.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #7 of 16 (permalink) Old 01-27-2014, 06:57 AM
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Mr. n/a, a name would be nice, You did not say what these rings that you will make will be used for. So will they hold the weight of an athlete? If they do then are you sure that you can make these rings out of wood and they won't collapse when some gymnast is swinging giant circles and upside down? If these home made rings break then so does someones back, or have I missed something about the rings you intend to make? If these rings will hold an athletes weight and you do not know how to do that so they will never break then this is one of those times that you buy ones that come with manufacturers warrantee, someone who has insurance concerning rings breaking. NGM
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post #8 of 16 (permalink) Old 01-27-2014, 07:16 AM
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Further to Neville's comment, if you are using a single solid piece of wood, you will have 2 weak spots, where the short grain is exposed - to overcome this you should laminate 2 pieces of wood with their grain directions at right angles.
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post #9 of 16 (permalink) Old 01-27-2014, 10:11 AM
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This looks like a potential liability issue as well as not wanting someone to get badly injured.
If you do this any of the ways described should work. Perhaps,laminated Birch plywood or something similar would be safer.
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post #10 of 16 (permalink) Old 01-27-2014, 10:53 AM
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I've gone back and reread your post DOMDJMBA and it appears you intend to make them from one solid piece of wood. Read Neville's post carefully and then forget about making your own rings.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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