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I'm working on a big project and needed four 7 3/4" circles. My first attempt was to use the circle cutting attachment on my Dremel Trio, but when I broke my bit and couldn't find a replacement in local stores (had to be ordered online only), I had to get creative.
Now, I have a jig saw, but even my best-cut circle wasn't perfect.
The jig saw wasn't gonna do.
There are tutorials on how to make circles on a table saw, but I'm not sure that such a small diameter would be a good idea (plus, I'm still kinda afraid of my table saw), soooooo that's out.
But I do have a router! Haven't had many chances to use it yet, so why not bust it out and try to make a jig?
The first thing to do was to see how I would attach it to my router. This was my first router jig, so I was pleasantly surprised to figure out that the clear baseplate on the bottom of my plunge base came off easily by just unscrewing four screws (you're totally allowed to laugh at me if this is common knowledge).
After that was removed, I grabbed some scrap 1/4" ply and traced the baseplate onto the plywood (including the screw holes).
And cut it out using my jig saw (doing a not-so-great job, which made me even more grateful I was making a jig instead of trying to cut four circles by hand).
I took this picture after I routed out the circles, but wanted to share how I marked it with the measurements with the circle's diameter, not it's actual distance from the inside of the bit (so four inches away from the bit would create an 8" circle. I plan to nail through the appropriate measurement into the board I'll be cutting when I use this in the future (the screw hole was just too big!).
A piece of advice if you make one: Make sure the nail is as straight as possible for the most accurate circle.
There are some great tutorials for prettier, fancier jigs (like this one on Instructables!)
But if you need a quick/easy one, this is always an option ;-)
Do you have a router? What kind of jigs do you have (or have you made)? I'm excited for the possibilities on this one!