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will it sag

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Forum topic by jmp posted 1274 days ago 769 views 0 times favorited 6 replies Add to Favorites Watch
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jmp

40 posts in 1295 days


1274 days ago

I really like the idea of making the cherry low bookcase (Woodsmith 155) but cant source the 3/4inch cherry veneered ply anywhere in the UK. 19 mm veneered MDF is the nearest i can get. Will using MDF risk the shelves sagging though?
cheers

Jonathan


6 replies so far

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jmichaeldesign

66 posts in 1386 days


#1 posted 1274 days ago

I think you’ll be alright. Looking at a quick picture of the shelves in question it looks like the shelves are about 36” wide on bottom, but the dividers on the upper shelves will actually support them in the middle, so at 18” I think you’ll be fine.

What veneered ply can you source? Especially with a dark stain birch ply and cherry blend together easily, and if you want a lighter tone, you could just build the whole thing from birch and stain it a medium tone.

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Nomad62

690 posts in 1561 days


#2 posted 1273 days ago

Hard to say. Mdf has its purposes, but I wouldn’t use it for shelving. I would tend to use an alternative wood rather that mdf if the cherry is unavailable simply because shelving tends to hold stuff that will eventually warp the mdf. Just my 2 cents worth…

-- Power tools put us ahead of the monkeys

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Moron

4666 posts in 2496 days


#3 posted 1273 days ago

I dont know the width of the mdf, nor if its face framed or has a solid front edge (helps) but if its over 32” wide (even that, it’s “iffy”) it will sag

-- "Good artists borrow, great artists steal”…..Picasso

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RickLoDico

55 posts in 1664 days


#4 posted 1273 days ago

That bookcase calls for a face frame. You can double up the mdf and it will never sag.

-- He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.

View Gofor's profile

Gofor

470 posts in 2390 days


#5 posted 1273 days ago

If forced to go with fiber board, you would be better served with HDF (high density fiberboard) as opposed to MDF (medium density fiberboard). Engineered wood flooring may also be an option.

Go

-- Go http://ncwoodworker.net/pp/showgallery.php?cat=500&ppuser=730

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Marlow

81 posts in 1274 days


#6 posted 1273 days ago

You could get a rough idea of the deflection by running the sagulator for different materials:
http://www.woodbin.com/calcs/sagulator.htm

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