Official Luthiers Forum!

I posted this in the general forum not knowing this sub-forum existed. I think I might be living here for quite some time.

I would like to post this circle cutter I built yesterday in hopes others might find something useful as I have from your designs and hard work building jigs.

I'm no luthier nor a very good wood worker but got sick and tired of my Dremel tool wrecking work and being a general PIA so I decided to build a Circle Cutting jig for my Bosch Colt.

I discovered lots of jigs on the web and on this site and liked the simplicity of a wooden jig, but the micro adjustability of some other designs so I combined both worlds. I haven't mounted the Colt router yet but am very happy with how solid it came out.

I used poplar for the base since it is so soft and oak and scrap walnut for the other parts. All the bottom edges are eased to minimize damage t the guitar top and I was able to get the adjustment down to almost zero back lash on the wing nut adjustment so I hope to be able to creep up on some finer detail with rosettes than otherwise possible with a single wing nut adjustment in other designs.

Also the 2 wing nut hold downs really create a stable pin locator. I have yet to figure out to really get the 3/16" pin set solidly as it is just press fit currently.

I haven't cut a circle yet but will later today and let you all know how it works in practice.

Here's a couple of pics.

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Thank You and Best To All

Bottom view, needs epoxy clean-up.



With Bosch Colt Mounted

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Thank You and Best To All

Here's link to a short discussion re: same on the general forum.

viewtopic.php?f=10101&t=38484

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Thank You and Best To All

Very clever Larry,
It looks super-sturdy.

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Hey Larry, nice job on the circle cutter! Looks like it will serve you well.
I cut threads on the pins and holes of my circle jigs with a tap and die set. I made several jigs for sanding, routing, and scoring the rosettes and soundboards. The oak you used will take threads nicely. I used aluminum, hickory, and some white melalmine for bases and they threaded good as well.

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The dullest pencil is sharper than the keenest mind.