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A question about wood movement

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Forum topic by Chris posted 10-31-2010 06:38 AM 863 views 0 times favorited 6 replies Add to Favorites Watch
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Chris

1867 posts in 2736 days


10-31-2010 06:38 AM

Topic tags/keywords: wood movement question veneer movement

A couple of weeks ago I started building a Mahogany book case. The case is Mahogany plywood and the face frame and top moldings are African Mahogany. After the carcase glue up I noticed a defect in the top.

This is how I designed it to look:

In trying to come up with a solution I thought I might raise the top moldings 1/4” and apply a veneer panel of resawn African Mahogany the same thickness to the top like this:

The question is should I glue the entire panel the plywood top or would the 1/4” thick wood move enough during seasonal variations to cause issues later?

Oh, The reason I would hide the top is that the case is only 60” high to begin with so would be visible to most folks.

-- "Everything that is great and inspiring is created by the individual who labors in freedom" -- Albert Einstein


6 replies so far

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Chris

1867 posts in 2736 days


#1 posted 10-31-2010 04:30 PM

No responses at all?

-- "Everything that is great and inspiring is created by the individual who labors in freedom" -- Albert Einstein

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a1Jim

112818 posts in 2322 days


#2 posted 10-31-2010 05:00 PM

Hey Chris
If you just add glue to the center approximatively 2” of the plywood and use finish nails to connect the top, then
the nails will flex enough to accommodated the wood movement on the sides ,then you can glue the the top 1/4” to the top. If you want to add some more insurance because of the wood movement on the top use 1/4 sawn wood and cut it into several sections instead of one solid piece of wood.

-- http://artisticwoodstudio.com Custom furniture

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Chris

1867 posts in 2736 days


#3 posted 10-31-2010 08:05 PM

Thanks for the responses so far…

Jim,

What would you do if you did not want to use any metal fasteners. I haven’t so far and was trying to see if I could avoid them.

-- "Everything that is great and inspiring is created by the individual who labors in freedom" -- Albert Einstein

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levan

427 posts in 1724 days


#4 posted 10-31-2010 08:34 PM

Chris I think your on the right track but I would glue on a thinner layer of hardwood veneer. Maybe an 1/8” max 1/16” would be better or even buy a piece of veneer. I think that would greatly reduce any chance of a problem with movement. Good luck

-- "If you think you can do a thing or think you can't do a thing, you're right". Henry Ford

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Beginningwoodworker

13347 posts in 2418 days


#5 posted 11-01-2010 02:37 AM

I would raise the molding.

-- CJIII Future cabinetmaker

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Ken Reed

151 posts in 1929 days


#6 posted 11-02-2010 09:10 PM

Also, if you veneer (or laminate) one side of the top your asking for trouble if you don’t also do the bottom of the substrate. Yes, the wood you apply to the top will move, regardless of its thickness. Wood never stops moving if its exposed to the air, and it IS exposed under normal finishes.

One thing that you might consider is to have the moldings lip over the top, like a fiddle on a countertop on a boat. This way you could let the wood move and expand out the back and not have to glue it to the top.

We all have had to cover our tracks before!

Let us know how it turns out.

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