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Thread: Circle Jig for a Router

  1. #1
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    Circle Jig for a Router

    I have been working on a shop built air cleaner/filter. In order to cut the circular holes in for the fan, I had to build a circle cutting jig for my router.

    Basically it is just a piece of plexi-glass that I mounted to the bottom of the my plunge router. It has a hole for the bit, and then holes for a pin (I'm using a nail with a gound down point). The holes are spaced so that when using a 1/2 in bit it will cut a circle (outer diameter) from 6 in to 25 in. I made it so that I can add additional holes in the future if the need arises. I wrote the increments on the plexi-glass, along with the size drill bit to use for the pin hole. I then taped over the writing with clear duct tape so that it won't wipe off.

    Very basic, but it does the trick.
    We create with our hands in wood what our mind sees in thought.
    Disclosure: Formerly was a part-time sales person & instructor at WoodCraft in Buffalo, NY.
    www.tinyurl.com/thewoodshoppe

  2. #2
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    Looks real nice, Sean. I needed to cut some smooth circles a while back, and made something similar to yours, but I didn't have any plexiglass. I ended up using a scrap of pegboard, then making a hole for the nail wherever I needed it (I didn't use the pegboard holes). I was surprised how well it worked. Yours is much nicer and more permanent.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
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  3. #3
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    What kind of bit do you use in the router? I've tried spiral cutters with zero success.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  4. #4
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    Quote Originally Posted by Frank Fusco View Post
    What kind of bit do you use in the router? I've tried spiral cutters with zero success.
    Frank,

    It is a straight 1/2in carbide bit, with a 1/4in shank. I would prefer to use a 1/2in shank, but I don't have one yet. The circle that I cut was in 3/4in pine plywood and was 11in in diameter. It took several passes, with the bit a little lower each time to make the circle. I have never used a router circle cutting jig before this. I was suprised as to how easy and well it worked.
    Last edited by Sean Wright; 04-28-2007 at 02:24 PM.
    We create with our hands in wood what our mind sees in thought.
    Disclosure: Formerly was a part-time sales person & instructor at WoodCraft in Buffalo, NY.
    www.tinyurl.com/thewoodshoppe

  5. #5
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    Very nice. That is one of those things that come in so handy when the need pops up. That's what I like about the jig section here; I come across something I'm trying to do and say "oh, so-and-so had a jig for that on FWW" and I can go find it.

  6. #6
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    I also made one a year ago for cutting the holes out for the blast gates. I used a piece of 3/8 plywood. Not pretty, but very functional. I found I needed to put 3 screws through the cut out part to something underneath, and also anchor down the piece I was keeping to keep from ruining it when I got to the end of the cut. Jim,
    Coolmeadow Setters...
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  7. #7
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    Quote Originally Posted by Jim O'Dell View Post
    I needed to put 3 screws through the cut out part to something underneath, and also anchor down the piece I was keeping to keep from ruining it when I got to the end of the cut.
    Here's a little trick I learned long ago when cutting circles with the router;
    Take a couple of pieces of scrap 3/4" or so wide and hot glue them to the underside spanning your circle. Just a couple of dots, one on each end and one or two in the center of the circle to hold it in place when you finish the cut. Works great to save either piece, the inside or outside depending on which is your "good" piece. The hot glue holds strong, but pops right off when you're done and doesn't leave any holes.
    Mike

    Attachment 8073

  8. #8
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    Quote Originally Posted by M Toupin View Post
    Here's a little trick I learned long ago when cutting circles with the router;
    Take a couple of pieces of scrap 3/4" or so wide and hot glue them to the underside spanning your circle. Just a couple of dots, one on each end and one or two in the center of the circle to hold it in place when you finish the cut. Works great to save either piece, the inside or outside depending on which is your "good" piece. The hot glue holds strong, but pops right off when you're done and doesn't leave any holes.
    Mike

    Attachment 8073
    Mike,

    Thanks! Thats a good idea!
    We create with our hands in wood what our mind sees in thought.
    Disclosure: Formerly was a part-time sales person & instructor at WoodCraft in Buffalo, NY.
    www.tinyurl.com/thewoodshoppe

  9. #9
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    I just made one also, but a bit larger, for a Triton. I needed a 41" and a 42" radius for bent lamination master forms. I had some 3/16" drill rod about, and used it for the pin. Strong and tight. Just a thought.
    Alan Turner
    PFW

  10. #10
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    That is a good idea Mike. On the blast gates, I just used the holes where I would be bolting it together with it's mate to anchor it down, so no unused holes. In fact, when I cut the holes out, I had bothe sides of the blast gate and the slide all put together so the circles all matched when I was finished. But there will be times when I don't have that luxury. Hopefully my brain will remember the hot glue idea! Jim.
    Coolmeadow Setters...
    Exclusively Irish!
    Home of Irish Setter Rescue of North Texas
    When Irish Eyes are smiling, they're usually up to something!!
    At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3


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