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How long can a table top be without support underneath?

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Forum topic by JohnEbinezer posted 03-08-2018 04:28 PM 1466 views 0 times favorited 10 replies Add to Favorites Watch
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JohnEbinezer

5 posts in 1219 days


03-08-2018 04:28 PM

Topic tags/keywords: question teak modern

Hello everyone.
I’m planning to build a dining table with Indian teak wood. 70×36 inches table top. Each leg will support a corner and I don’t wanna be adding any support underneath the table top.
My question is, without the support underneath, will the top sag over time?
What should be the ideal thickness of the top to avoid sagging?

For reference, I’m adding a pic that I downloaded online.

Thanks in advance.
https://s3.amazonaws.com/vs-lumberjocks.com/p5a5m7v.jpg!


10 replies so far

View Robert's profile

Robert

3485 posts in 1935 days


#1 posted 03-08-2018 04:33 PM

Unsupported wood tends to sag, so yes.
3” thick?

Your instincts are correct. That table is poorly designed from a ww’ing standpoint.

If you’re bound and determined, I suppose you could incorporate steel tension rods underneath similar to a guitar neck.

-- Everything is a prototype thats why its one of a kind!!

View Loren's profile

Loren

10477 posts in 4102 days


#2 posted 03-08-2018 04:45 PM

I’m less concerned about the top sagging
in this case than I am about the legs wobbling.

View Woodknack's profile

Woodknack

12877 posts in 2835 days


#3 posted 03-08-2018 05:43 PM

I don’t know enough about staked furniture to give you a meaningful answer but what you posted looks like a coffee table and may not be solid wood. 70 inches isn’t all that long but consider there is a good chance of the top cupping or bowing over time. If it were me I would seek out someone with lots of experience on staked furniture.

-- Rick M, http://thewoodknack.blogspot.com/

View LittleShaver's profile

LittleShaver

565 posts in 1074 days


#4 posted 03-08-2018 05:45 PM

You may want to try the sagulator for checking thickness and span.

As to the legs, through or almost through mortises could help with the wobble and the splay shown in your picture would also help greatly with stability.

-- Sawdust Maker

View Woodknack's profile

Woodknack

12877 posts in 2835 days


#5 posted 03-08-2018 05:47 PM

Actually if it were me, I would build a torsion top and veneer it.

-- Rick M, http://thewoodknack.blogspot.com/

View Andre's profile

Andre

2696 posts in 2260 days


#6 posted 03-08-2018 07:05 PM

Make the top out of Veneered Basswood ?

-- Lifting one end of the plank.

View TheFridge's profile

TheFridge

10859 posts in 1940 days


#7 posted 03-08-2018 07:07 PM

Alder.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Rich's profile

Rich

4701 posts in 1044 days


#8 posted 03-08-2018 07:29 PM


Alder.

- TheFridge

I guess you missed it over in the “Why so many wonderful images…” thread. Alder’s not funny anymore.

-- My grandfather always said that when one door closes, another one opens. He was a wonderful man, but a lousy cabinet maker

View Andre's profile

Andre

2696 posts in 2260 days


#9 posted 03-08-2018 08:45 PM


Alder.

- TheFridge

I guess you missed it over in the “Why so many wonderful images…” thread. Alder s not funny anymore.

- Rich

Not so sure about that, I got a chuckle! There may be some truth in the statement, Alder is the King of all Woods!
Or perhaps use Oak and stain it Alder?

-- Lifting one end of the plank.

View JohnEbinezer's profile

JohnEbinezer

5 posts in 1219 days


#10 posted 03-09-2018 04:15 AM

Thanks, everyone.

If you re bound and determined, I suppose you could incorporate steel tension rods underneath similar to a guitar neck.

- rwe2156


3 inches would be too thick. The very purpose of going without support is not solved.
I think steel rods are a good alternative. Thanks :)

Loren: Yes, I did think about the legs. Even if the joint atop is strong, it might sway.
Woodknack: I’m not sure if it is solid wood. But yea, it is a dining table. Not a coffee table. Torsion top is something I’ll sure consider.
Littleshaver: Sagulator. Hearing it for the first time. I tried and it shows acceptable sag.

Thanks again folks

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