cutting inside curved corners

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Blog entry by lumer posted 10-31-2012 10:22 PM 1213 reads 0 times favorited 5 comments Add to Favorites Watch

i need to make a platform for my daughters sewing machine, the platforme is to be approx 12×8 and i need to cut out the center approx 6×4 and the inside corners need to be rounded to mach the plate on the machine and i wonder if any one has a system for cutting a inside rounded corner? i think i saw somewhere tat you cold do it with a router, i could do it with my scroll saw but there must be a better way

5 comments so far

View Bigrock's profile


292 posts in 2991 days

#1 posted 10-31-2012 10:49 PM

You can do it with with Forstner Bit the correct size, or with a template router bit. The straight work with a saw and clean it up with a router.

View Sandra's profile


7207 posts in 2104 days

#2 posted 10-31-2012 10:49 PM

If you want to cut out a rectangle in the middle of a board with rounded corners, I’m thinking a jigsaw would work. You have to be careful in the corners not to snap the blade, but you can back off and approach the corner at a different angle until you get it completely cut out.

Hopefully someone with more experience can give you some insight.

Good luck

-- No, I don't want to buy the pink hammer.

View Gary's profile


9333 posts in 3461 days

#3 posted 10-31-2012 11:40 PM

Do you by any chance have an oscillating sander?

-- Gary, DeKalb Texas only 4 miles from the mill

View Grumpymike's profile


2263 posts in 2344 days

#4 posted 11-01-2012 12:05 AM

Depends on the radius. for small radii use the forsner bit and a saber saw (jigsaw) to cut the streight areas and clean up with lots of sanding or a router.

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

View Chris Wright's profile

Chris Wright

540 posts in 3510 days

#5 posted 11-01-2012 12:45 AM

I’m in the router camp. Similar to cutting the opening for a router table lift plate. If you’re careful with a table saw you can make a template pretty easy by cutting a piece of plywood or mdf a known size bigger on all sides (e.g. 3 inches, so a board that is 12×10), set your fence to 3 inches and bring the blade up through the board till it gets close to a mark made on the top, proceed to rip the board till the cut come close to a stop line at the end of the board then shut the saw off and repeat this step for the other three sides. be sure not to cut all the way to your stop lines, last thing you want is a loose board to get jammed in the opening. Use a little hand saw to cut the remaining bit and you now have your router template that you can use with a pattern bit with. You can also use stop blocks on the fence to help with starting and stopping. I understand this trick for making a template is a little scary, so don’t try it if you’re not comfortable with it.

-- "At its best, life is completely unpredictable." - Christopher Walken

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