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How to cut interior radius of 2x4

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Forum topic by AverageMale posted 05-06-2020 11:45 PM 985 views 0 times favorited 26 replies Add to Favorites Watch
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AverageMale

5 posts in 265 days


05-06-2020 11:45 PM

I have a 2×2x4 (2 foot length of 2×4) and need to cut an internal radius (lengthwise) within the 2×4.

Sort of like this (minus the bad drawing/lines): https://sketch.io/render/sk-8ba4c9be5833d4be70d0db739a771e25.jpeg

It’s that internal radius/curve that is troubling me.

I have a table saw, drill press, hand electric sander and saws and such. Any suggestions?

Thanks


26 replies so far

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John Smith

2822 posts in 1138 days


#1 posted 05-07-2020 12:30 AM

if you could elaborate on the project a little – might expand the
options that may be within your skill set and available tools.
you didn’t mention if you have any routers.

is the inside radius going to be a round circle or oval ?
and – what size is everything going to be ??

.

-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

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Aj2

3599 posts in 2773 days


#2 posted 05-07-2020 12:34 AM

If I had to make that piece I would try wrapping some 80 or 40 grit sandpaper around a dowel of wood or something .
And grind away.
If I had a lot of them to do I would spend the time making some kinda contraption on my router table.

-- Aj

View Craftsman on the lake's profile

Craftsman on the lake

3639 posts in 4413 days


#3 posted 05-07-2020 12:45 AM

Set the piece and brace it so it sits like a V. Make a sled that will follow the edge across the top of the V. Bolt a router to the sled with an appropriate round bit in it. Slide it across to get the desired round shape. You’d need a bit with a long shaft though.

Maybe????

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

View JIMMIEM's profile

JIMMIEM

115 posts in 1817 days


#4 posted 05-07-2020 01:22 AM

Depending on the size a cove cut on the table saw might be a possibility. Might have to install a smaller size blade on the saw.

View Walker's profile

Walker

443 posts in 1448 days


#5 posted 05-07-2020 01:56 AM

Use a half round gouge chisel.

-- ~Walker

View AverageMale's profile

AverageMale

5 posts in 265 days


#6 posted 05-07-2020 02:36 AM



if you could elaborate on the project a little – might expand the
options that may be within your skill set and available tools.
you didn t mention if you have any routers.

is the inside radius going to be a round circle or oval ?
and – what size is everything going to be ??

no router, radius will be circular, Like this:

dimensions are not so important but if you need numbers, let’s say the resulting thickness of the walls will be 1” of the 24” length of 2×4 stock. This is for a music sheet stand for an electronic piano, where this item will have two slots cut in it, one slot will support the music sheet backing that will be a 1/4” thick plywood (or similar) and the other slot will be used to shim a cleat that fits into a slot along the top of the electric piano. For example:

Larger image

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bandit571

27519 posts in 3659 days


#7 posted 05-07-2020 02:40 AM

Bandsaw…or, a corebox plane….

-- A Planer? I'M the planer, this is what I use

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LeeRoyMan

1488 posts in 702 days


#8 posted 05-07-2020 02:59 AM

Cut the lip off of a piece of cove molding and glue it into the corner of your cut out 2×4.

View AverageMale's profile

AverageMale

5 posts in 265 days


#9 posted 05-07-2020 03:03 AM


Cut the lip off of a piece of cove molding and glue it into the corner of your cut out 2×4.

- LeeRoyMan

I like it. Thanks!

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LeeRoyMan

1488 posts in 702 days


#10 posted 05-07-2020 03:09 AM

YW
You could also just cut your own cove molding if you have a router bit for it.

View SMP's profile

SMP

3202 posts in 881 days


#11 posted 05-07-2020 03:37 AM

It looks like it doesn’t need to be coved at all. Unless I am missing something?

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waho6o9

8977 posts in 3552 days


#12 posted 05-07-2020 03:45 AM

Borrow or rent a router

View Walker's profile

Walker

443 posts in 1448 days


#13 posted 05-07-2020 04:54 AM

I too like the idea of gluing a piece of cove molding in there. However, unless you have some OCD about it, seems like you could just make a square cut and not worry about the gap.

-- ~Walker

View John Smith's profile

John Smith

2822 posts in 1138 days


#14 posted 05-07-2020 11:21 AM

actually, this is not “cutting out” the radius but it is “filling in”.
for something like that, that will not be seen, I would focus
on building the sheet stand and not worry about the round fit
(that will not be seen). it serves no purpose other than cosmetics
to make the inside fit the contour of the piano case.
just make a square cut and build the sheet holder.
(or – fasten two pieces of dimensional boards together).

that’s what I would do.

actually, that technique in boat building is called “filleting”.
where thickened epoxy is used to smooth out a tight corner joint.

.

-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

View GR8HUNTER's profile

GR8HUNTER

8261 posts in 1688 days


#15 posted 05-07-2020 02:05 PM


Cut the lip off of a piece of cove molding and glue it into the corner of your cut out 2×4.

- LeeRoyMan


+10 GR8 IDEA LeeRoy :<))))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN :<))

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