Simple Router Circle Jig

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Blog entry by Axis39 posted 03-28-2020 01:43 AM 843 reads 0 times favorited 0 comments Add to Favorites Watch

Simple might still be overstating things…

I needed to make a circular hole in a speaker baffle at a hair over 9”. I love using templates with my routers… But, I needed to make an accurate template. I hate taking the screws out of my router bottom plates… I’m always losing the screws!

So, I contemplated.

Made a few starts.

Then, was suddenly hit with inspiration!

I have a little battery operated Ridgid Trim Router that I use for soooo many things. I like it’s balance and weight and it has enough power to do things just like this.

So, I grabbed a piece of scrap 2×4 (because I wanted to do a test before ruining a nice (expensive) piece of wood) and some drill bits, a set of calipers, a square and a pencil. I also grabbed a couple of 1/4-20 bolts and inserts (I buy them in bulk) and a trim head screw.

I put the accessory rods into my router, and measured the outside distance (2 5/8). Then subtracted one rod’s diameter (5/16). By subtracting the rod’s diameter, I now have the center to center distance.

I grabbed a 21/64 drill bit (hair larger than the 5/16 of the rods, to make them slide easily) and drilled all the way through, following the grain. I lined up the holes so that the bottom of the block would line up with the bottom of the router bottom plate Then, grabbed a 3/8” bit for my inserts and drilled perpendicular to the rod holes… and only until the bit cut about 1/3 into the rod hole. Then, I drilled a hole about in the center, about a 1/4” in from one side for my trim head screw (also known as the pivot).

Then it was time to install all the bits and bobs.

and pop it on the router.

And, bam! It works like a charm!

-- John F. SoCal transplant, chewer uppper of good wood

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