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I used this kit with my router last summer to cut 10 to11 inch round bases to replace rotted column/pillar bases on my house.
I'm not exactly sure what you are doing but this would work best with a fresh piece of lumber rather than enlarging an existing hole.
I used it to make round discs from 2x12 lumber.
Last edited by royalabran; 12-22-2021 at 12:21 PM..
Even with an electric jigsaw it's hard to keep a blade cutting straight so:
Mark the circle to be cut with a pencil and use a drill with an 1/8th drill bit to drill holes all around the inside of the line. Replace with a 3/16th and re-drill. Replace again until you're up to 5/16ths. You now have 'relief cuts' in the form of holes laid out in the marked off circle.
Now you can easily cut between the holes with a cheap one-time-only coping saw or an electric jigsaw. Or you could nibble the remaining wood out with the drill & bit. The center material will be easy to remove once you get the perimeter line whittled away.
You may have to use a rasp to get the cut perfectly smooth but this is a cheap 'n easy way to cut large circles.
Yeah, I had a co-worker who was building a bookshelf and wanted to even out some boards. I said "get a block plane" and he came back with a picture of a power plane (also known as "the finger eater"). I said, no, no, a Stanley # 9 1/2. Even showed him a picture. He simply could not comprehend that the $75 block plane would do a better job, faster, than the $400 power tool.
The other one I like to pose to people: "Let's say you have a piece of wood, 2" x 1" x 1". How would you take 1/2" off this?" and they'll come up with all kinds of unsafe ideas involving table saw fences, circular saws running 3/4" away from their fingers, and god only knows what all. I pull out a sharp crosscut saw and their heads explode - like I'd suggested replacing all the spark plugs in their car with flint and steel.
You should see the millennials gape when I take out weeds in the yard with a hoe.
I also know how to do long division with nothing more than a paper and pencil.
Sheesh. OP wants to cut a hole in a piece of plywood. Has zero knowledge or experience in working with hand tools.
A $20 coping saw, a pencil, a piece of string, and another board to stick a thumbtack into to anchor the end of the string. That's what you use in this case. You don't buy a bunch of expensive power tools you don't know how to use. Using a coping saw is obvious by inspection. Push down, pull up, follow the line.
Sheesh. OP wants to cut a hole in a piece of plywood. Has zero knowledge or experience in working with hand tools.
A $20 coping saw, a pencil, a piece of string, and another board to stick a thumbtack into to anchor the end of the string. That's what you use in this case. You don't buy a bunch of expensive power tools you don't know how to use. Using a coping saw is obvious by inspection. Push down, pull up, follow the line.
Amen !
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Check out this video for some guidance on how to use one. 
Circle Kit from Lowes
