need help how to build C shaped side table to hold computer - AVS Forum
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post #1 of 12 Old 11-21-2013, 06:33 PM - Thread Starter
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i'd like to build a C shaped table out of wood/MDF to hold the computer up behind the TV (i cant do a shelf)
I'm interested in the physics - like how thick or what kind of bracing and such i need to do to hold the ~40lbs thing up.
example image - but i want it wide to fit the computer sideways...
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post #2 of 12 Old 11-21-2013, 08:31 PM - Thread Starter
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found something - maybe i just get 3 sides top, bottom, vertical and join them with shelf brackets(!cheap) that support a certain amount of weight
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post #3 of 12 Old 11-22-2013, 04:49 AM
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I'd think you'd want something like a locking rabbet joint, something like this:
http://www.woodsmithshop.com/download/509/locking-rabbet-joints.pdf

Except made out of 3 sheets (if not 4) of 3/4" laminated with the top screwed into the back.

I'd probably go with plywood/hardwood (or at least some of either) rather than MDF, since MDF isn't terribly strong unsupported.

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post #4 of 12 Old 11-22-2013, 06:08 PM
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For only forty pounds, I would do a simple butt joint using polyurethane glue.
The glued joint would be stronger then the wood.
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post #5 of 12 Old 11-22-2013, 07:49 PM - Thread Starter
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i dont know how thick the vertical leg should be (19 in high)
and how long the foot? same size as the top? (20in wide and 10 deep)
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post #6 of 12 Old 11-23-2013, 06:54 AM
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Quote:
Originally Posted by Tedd View Post

For only forty pounds, I would do a simple butt joint using polyurethane glue.
The glued joint would be stronger then the wood.

While true, you don't get a lot of surface area or mechanical strength that way. You'd be better off doing some sort of more "advanced" joint. It doesn't even need to be complicated to do, especially if you build out of standard 3/4 stock. Actually something where you alternate the but joints as you layer/glue up the boards would work well, like this (if my ASCII art works):

====
|====
||====
|||
|||

You could screw each horizontal piece into the end of each vertical piece, and get a lot of mechanical strength and a lot of glue area.
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Originally Posted by bulls View Post

i dont know how thick the vertical leg should be (19 in high)
and how long the foot? same size as the top? (20in wide and 10 deep)

I'd make it all the same thickness (I'd probably go 2 1/4" (3, 3/4" boards). How deep? Aesthetically I'd keep the top and bottom the same, how big probably depends on the overall size you want, 20x10 would probably be pretty stable, especially if it's on a solid floor (if it's on carpet you might want some sort of feet on it.

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post #7 of 12 Old 11-23-2013, 05:04 PM
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You don't need a ton of surface area to get a simple polyurethane glued butt joint to
be stronger then the wood itself.....
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post #8 of 12 Old 11-23-2013, 05:35 PM
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"Glue joint = stronger than the wood itself" may be true; but you need to ask how strong the wood is in a construction like this, and how strong it is where and in what direction. If using plywood or MDF I wouldn't trust a butt joint not to just delaminate or peel a layer of material right off and come crashing down, especially if you consider the leverage and the actual forces at work. Even soft woods might be prone to split and pull apart in the same way once there's weight on the joint, IMHO. My vote goes for the metal brackets or some type of interlocking joint.
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post #9 of 12 Old 11-23-2013, 06:47 PM
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It's a forty pound static load. There really isn't much leverage at work here either.

No MDF and who said anything about plywood? A simple piece of 1x hardwood would
be up to the task. Throw in a couple of screws from the bottom if you must...

Does the OP have the tools to do a interlocking joint?
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post #10 of 12 Old 11-23-2013, 07:15 PM - Thread Starter
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i have a hammer, and a handheld 10in coping saw
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post #11 of 12 Old 11-23-2013, 08:02 PM
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I guess you could have Home Depot cut your wood to size then...

And maybe invest in a couple of clamps.

Stanger89's layered and glued approach is an option.
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post #12 of 12 Old 11-23-2013, 08:15 PM
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Well. if that weight is towards the front of the shlf, there is a lot of leverage. if laminating up layers I would hide a metal L-bracket between them. Biscuit joints would be nice for glue area. Drilling and doweling is another option. Got a friend with a shop?
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