Circle Jig - Jasper 400 - Router Forums
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post #1 of 24 (permalink) Old 03-08-2010, 02:38 AM Thread Starter
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Default Circle Jig - Jasper 400

I've been working on my RT cabinet for several months now and needed to cut a 6" hole in the side of some 3/4" maple veneer plywood to connect my DC hose.

The Jasper 400 replaces the router base plate and cuts 1" to 7" in diameter in 1/16" increments. It comes pre-drilled for many routers (compatibility guide attached) and a centering jig. All told, it was installed in a couple of minutes.

It pivots on a 1/16" steel pin (provided), so usage simply entailed tacking a scap piece across the back to retain the cutout, drilling the center hole, inserting the pin and placing the jig hole corresponding to the diameter you want to cut and pivoting the router. In my case I cut the hole on a vertically mounted panel. I've attached a few pictures of the jig mounted on my Craftsman 17543 plunger, the piece cut out and the finished hole.

As you can see, the resulting cuts was very smooth. It is sized for use with a 1/4" bit, in order to permit 1" diameter holes. At $20 on Amazon for a jig with 97 precision-cut holes (1" to 7" by 16ths), its tough to justify making your own, IMNSHO.

Great buy!
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post #2 of 24 (permalink) Old 03-08-2010, 06:31 AM
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hi Jim,

that is a nice jig and nice job on cutting the hole.

one of my first real jigs was to make a circle cutting jig. it was very simple and easy to make. it also was very economical, in that it didnt cost me anything,

also what i do like about my jig is that it uses a guide bushing and you dont need to mount it to the router.

http://www.routerforums.com/attachme...d-100_0604.jpg

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post #3 of 24 (permalink) Old 03-08-2010, 06:54 PM Thread Starter
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Free is sure good, Levon! :-)

After I first heard about your jig, I called Jasper to ask about the through-hole size in some of their larger circle cutters, as I was hoping that theres might be able to work with a guide bushing. Unfortunately, there's are supposedly 1-3/4" diameter. :-(

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post #4 of 24 (permalink) Old 03-08-2010, 06:59 PM
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hi Jim,

it wasnt my jig, i got the knowhow from my friend BobJ. but it was easy to build and worked great!

ive heard lots of good things about the jasper jig. im just a old cheapie!

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post #5 of 24 (permalink) Old 03-08-2010, 07:33 PM
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Default loooooooooooking good!!!

You are such a tease!!!!!!
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post #6 of 24 (permalink) Old 03-08-2010, 07:43 PM
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You are such a tease!!!!!!

huh??????

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post #7 of 24 (permalink) Old 03-08-2010, 08:11 PM
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That was for BigJim Levon......

edit... for him letting out just a few pics of his table...
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post #8 of 24 (permalink) Old 03-08-2010, 08:28 PM
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Yes, Jim

That is the one I have (cost me more that $20 though)

Works great with the 3612C...

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post #9 of 24 (permalink) Old 03-08-2010, 09:00 PM
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Hi Jim

Here's a shot of the shop made Jasper jig that can take on the brass guide,I also have a plastic one (fac.made) that can take on the 1 1/2" guide,it's a easy rework to take on the brass guides best of all you don't need to screw the jig the router base plate just drop the router in place and cut the cir.out..

========

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Originally Posted by BigJimAK View Post
Free is sure good, Levon! :-)

After I first heard about your jig, I called Jasper to ask about the through-hole size in some of their larger circle cutters, as I was hoping that theres might be able to work with a guide bushing. Unfortunately, there's are supposedly 1-3/4" diameter. :-(


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post #10 of 24 (permalink) Old 03-09-2010, 02:53 AM Thread Starter
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Hi BJ...

You sold me on the 1-1/2" guides some time ago, buddy... and I'm all *over* wanting to use them with a circle jig, for larger diameters. How did you modify the fac jig for 1-1/2-ers? Did you mount a piece of plexi under the guide and them re-drill it with forestner bits, were you able to find one with 1-1/2 or smaller hole or did you turn a larger OD guide on your lathe? The first two I could do but I don't have access to a lathe, dang it!

The 400, being round and of reasonable size could be a permanent attachment on a router unless you wanted to use guides with it but dedicating a router plunge base to the larger circle jigs would be a awkward PITA or lead to an under-utilized router. Well, unless I had a collection of routers like yours! <g>

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Last edited by BigJimAK; 03-09-2010 at 02:55 AM.
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