Making a shallow cove on table saw

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Forum topic by Jack Lewis posted 07-14-2018 06:24 PM 822 views 3 times favorited 5 replies Add to Favorites Watch
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Jack Lewis

576 posts in 1886 days

07-14-2018 06:24 PM

Is there a method besides trial and error to making a cove cut of particular dimensions, (example: 1/16” deep x 1” wide) in the lumber? I want it to mate up with a cylinder with fairly good fit.

-- "PLUMBER'S BUTT! Get over it, everybody has one"

5 replies so far

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#1 posted 07-14-2018 07:59 PM

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#2 posted 07-15-2018 03:01 PM

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#3 posted 07-15-2018 03:16 PM

You didn’t mention what the radius of the cylinder is but unless I am thinking about this wrong, I think that most of the setups for cutting a cove on a table saw will not match up with a cylinder. I think that the only setup that would be a true cylinder is one where you are at a 90 degree angle (zero being a normal rip cut) to the saw blade and then it would only have the radius of the blade itself. All other configurations would probably be closer to a parabola. For example, if you keep the blade at a fixed depth and adjust the angle you slide through blade, the further you move from 90 the more the edges move towards each other and the less circular it becomes. At only 1/16” deep and 1 inch wide, that might not matter for your application but it might be easier to use a cove bit with your router if that is the case, depending upon what the radius of the cylinder is.

Just a thought.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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#4 posted 07-15-2018 05:23 PM

The dimensions shown would indicate that the radius of the cylinder is 2.03125” or 4.0625” diameter. You will not be able to cut that radius on a circular saw. You could use a fly cutter in a drill press to cut the hole, then saw off leaving 1/16” of depth. I suspect this is going against a pipe. If so, a dado 1” wide x 1/16” deep will serve the purpose.

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#5 posted 07-16-2018 04:59 PM

As Nathan indicates, a true circular cove on the TS requires a 90 deg to blade feed. While this is ok, you are limited in radiuses to common blade diameters (10”, 8”, 7-1/4”, 6”, etc.). Once you reach the limit where a small blade will not peek much above the TS table, you can turn to router “core box” bits or drill bits followed by slicing the drilled blank in two.

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