Small dia. circle jig - Router Forums
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post #1 of 10 (permalink) Old 05-02-2017, 12:48 PM Thread Starter
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Default Small dia. circle jig

Doing a search here on the forum I came across this old post showing a DIY small dia. circle jig that may work for me! Router Forums - View Single Post - Small diameter circles.

I have a Bosch 1617/1618 EVS combo with a RA-1054 edge/circle guide, Just wondering if anyone has made an adapter (like pictured in the linked post) for the RA-1054 to make smaller than 4" dia circles?

Doug
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post #2 of 10 (permalink) Old 05-02-2017, 01:50 PM
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If you are talking about making the hole all the way thru, I just use a hole saw.
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post #3 of 10 (permalink) Old 05-02-2017, 02:09 PM
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On the few occasions where I needed to route circles smaller than 4 inches, I would do this. Set the router circle jig to make (for example) a six inch circle and cut that out of a piece of stock. Throw the circle away and use the remaining/resulting "donut hole" as an edge guide. Put the router inside the donut hole and follow the inside edge. You can get as small a circle as you can do the math for by making your own circular edge guide. Did I explain that okay?
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post #4 of 10 (permalink) Old 05-02-2017, 05:58 PM Thread Starter
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Quote:
Originally Posted by JOAT View Post
If you are talking about making the hole all the way thru, I just use a hole saw.
Yeah to bad it wasn't that easy!

I'm looking to make some trunnions & matching radius grooves for a tilting table on a disk sander.

Doug
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post #5 of 10 (permalink) Old 05-02-2017, 06:28 PM Thread Starter
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Originally Posted by cjhilinski View Post
Put the router inside the donut hole and follow the inside edge. You can get as small a circle as you can do the math for by making your own circular edge guide.
Yeah that could work, As long as I could figure out the math needed correctly.

I would need to figure out three different size patterns, One for the inside radius, One for the outside radius, Then one for the matching radius groove.

Doug
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post #6 of 10 (permalink) Old 05-02-2017, 08:05 PM
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Maybe this thread will be helpful: http://www.routerforums.com/general-...-trimming.html The world's simplest circle jig is described in post #2.

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post #7 of 10 (permalink) Old 05-02-2017, 09:08 PM Thread Starter
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Maybe this thread will be helpful:
Chuck,

Thanks for the link & moving my post!

Doug
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post #8 of 10 (permalink) Old 05-03-2017, 07:43 AM
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Are you one of us who bought a CRB7 jig? These are similar to the one in your link, but can do many other things as well. Since I have a CRB7 I would use it instead of making one. The Jasper circle jigs are also very handy for cutting circles of many sizes with a router.

Charley

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Last edited by CharleyL; 05-03-2017 at 07:46 AM.
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post #9 of 10 (permalink) Old 05-03-2017, 09:13 AM Thread Starter
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Are you one of us who bought a CRB7 jig?
No not me, However I have thought about getting one?
Just trying to justify the cost since my Bosch RA105 will do a lot of the same functions as the CR87.

Doug
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post #10 of 10 (permalink) Old 05-03-2017, 12:31 PM
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Quote:
Originally Posted by dwall174 View Post
No not me, However I have thought about getting one?
Just trying to justify the cost since my Bosch RA105 will do a lot of the same functions as the CR87.

Doug
I've been wanting the CRB7 also. It costs a lot, but when you need it, you need something that's fairly safe.

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