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Dado Shelves adjacent to each other?

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Forum topic by Jeff B. posted 01-02-2017 08:19 PM 496 views 0 times favorited 11 replies Add to Favorites Watch
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Jeff B.

6 posts in 350 days


01-02-2017 08:19 PM

Hello,

When using 3/4” plywood, can I use 1/4” Dados to support shelves directly next to each other, or must they be staggered. Is the remaining 1/4 ” of material enough? . In this instance, the shelves will span about 3’, but will only support a total of about 10-12lbs (empty suitcases)

Thanks for your advice


11 replies so far

View MrRon's profile

MrRon

4492 posts in 3080 days


#1 posted 01-02-2017 08:41 PM

You should have no problem. The thickness of the shelf itself will contribute strength at the joint. Just make sure the fit is as close as you can get. The glue will also add support.

View jerryminer's profile

jerryminer

802 posts in 1277 days


#2 posted 01-02-2017 09:36 PM

+1 ^^ I’ve done this many many times. It works fine.

-- Jerry, making sawdust professionally since 1976

View pintodeluxe's profile

pintodeluxe

5464 posts in 2649 days


#3 posted 01-02-2017 10:09 PM

I would avoid it. 1/4” is not enough material for adequate support. Consider not only current use, but potential future uses (heavy books?). You posted this question because your gut didn’t like the look of it. Trust your gut.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View johnstoneb's profile

johnstoneb

2640 posts in 2009 days


#4 posted 01-02-2017 10:21 PM

It will work fine. I have done it several times. Your shelf needs to be thick enough to hold the load without sag. The load at the joint is vertical.

-- Bruce, Boise, ID

View bondogaposis's profile

bondogaposis

4478 posts in 2187 days


#5 posted 01-02-2017 10:37 PM

Yes, it will work. There are few things to consider though. First is that 3/4” plywood is not 3/4” thick. So if you cut 1/4 dados adjacent to each other the remaining piece is somewhat less than 1/4’’ which isn’t much. What I do in that situation is to cut the dados 3/16” deep, that gives 1/8” more thickness on the case.

-- Bondo Gaposis

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johnstoneb

2640 posts in 2009 days


#6 posted 01-02-2017 10:39 PM

+1 Bondo

-- Bruce, Boise, ID

View jbay's profile

jbay

1856 posts in 735 days


#7 posted 01-02-2017 10:43 PM



I would avoid it. 1/4” is not enough material for adequate support. Consider not only current use, but potential future uses (heavy books?). You posted this question because your gut didn t like the look of it. Trust your gut.

- pintodeluxe

Would you please explain why?

-- If anyone would like to see my Portfolio, PM me and I would be glad to send you the link.

View Jeff B.'s profile

Jeff B.

6 posts in 350 days


#8 posted 01-02-2017 11:54 PM

Thanks very much for the thoughtful replies.

View a1Jim's profile

a1Jim

116568 posts in 3413 days


#9 posted 01-03-2017 12:11 AM

Hi Jeff welcome to Ljs
I agree 1/4” will support the weight you talking about and perhaps as little as an 1/8” will work.Through the years I’ve gotten in the habit of making my dados half the thickness of my 3/4” ply but that’s not necessary.It will depend on your material if you want to go to the other extreme of only using 1/8 dados.

-- http://artisticwoodstudio.com Custom furniture

View jmartel's profile

jmartel

7522 posts in 1986 days


#10 posted 01-03-2017 01:03 AM

You could compromise and do 3/16” depth. That leaves you with 3/8” web between shelves while giving you a deeper socket than 1/8”.

-- The quality of one's woodworking is directly related to the amount of flannel worn.

View wuddoc's profile

wuddoc

233 posts in 3554 days


#11 posted 01-03-2017 01:29 AM

You may want to file this from WoodBin. The Sagulator or deflection versus span and other variables.
http://www.woodbin.com/calcs/sagulator/

-- Wuddoc

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