Width of dado - Woodworking Talk - Woodworkers Forum
 
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post #1 of 8 Old 07-12-2011, 11:12 AM Thread Starter
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Width of dado

I am getting ready to cut the dadoes for my hallway storage locker. I have done lots of test cuts and I'm a little stuck for which width of cut to use for the dado. One is quite tight, I had to hit the wood to get it in. Then when I added the smallest shim possible it became a little loose. Not sure which I should use. The wood I am using is maple ply. I know that this is probably the highest humidity time of year. Will plywood be affected by humidity as much as solid wood?
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post #2 of 8 Old 07-12-2011, 11:18 AM
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I am getting ready to cut the dadoes for my hallway storage locker. I have done lots of test cuts and I'm a little stuck for which width of cut to use for the dado. One is quite tight, I had to hit the wood to get it in. Then when I added the smallest shim possible it became a little loose. Not sure which I should use. The wood I am using is maple ply. I know that this is probably the highest humidity time of year. Will plywood be affected by humidity as much as solid wood?
You might try just using a block sander and giving both sides of the ply a quick swipe.








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post #3 of 8 Old 07-12-2011, 11:27 AM Thread Starter
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I didn't do enough research before cutting all my pieces out of the sheets. I planned to cut 3/8 deep dadoes into the 3/4 ply. I later read that they should only be 1/3 of the thickness. Will it be ok that I cut them 1/2 way through?
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post #4 of 8 Old 07-12-2011, 11:42 AM
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I didn't do enough research before cutting all my pieces out of the sheets. I planned to cut 3/8 deep dadoes into the 3/4 ply. I later read that they should only be 1/3 of the thickness. Will it be ok that I cut them 1/2 way through?
Yeah...this time...but don't ever let it happen again. With that deep of a dado, a weakness occurs in the substrate at the base of the dado. Make sure you glue in the bottom of the dado, and the ply is fully seated in the dado. Once the glue dries, that joint will be reinforced.








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post #5 of 8 Old 07-12-2011, 10:58 PM Thread Starter
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Thanks for the advice. I think it will help. I just hope all the pieces fit together now since I cut them all from drawings.
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post #6 of 8 Old 07-13-2011, 03:58 PM
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That reminds me of a time I built a bed and did every single cut from the drawings before I test fitted anything at all. "Ok, pieces are all cut, time to put it together!"

One of the biggest head-scratchers I've ever had. The drawings had a couple teeny weeny MAJOR flaws in the dimensions!

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post #7 of 8 Old 07-13-2011, 05:13 PM
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Sounds like you need a shim, thinner than the thinnest possible! Piece of paper, tissue paper? Hit the edge of dado with a sanding block?
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post #8 of 8 Old 07-13-2011, 05:18 PM
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Hit the edge of dado with a sanding block?
The piece that fits into the dado.








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