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wood expansion between different species

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Forum topic by yrob posted 06-15-2011 11:23 PM 1442 views 0 times favorited 6 replies Add to Favorites Watch
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yrob

340 posts in 3115 days


06-15-2011 11:23 PM

Topic tags/keywords: pine walnut

I am thinking about gluing up walnut and pine by butting up one piece to another to make a box with walnut corners. I have two questiosn regarding that.

1) Should I do a breadboard kind of joint or will glue hold well enough across the end grains without that ?

2) I was wondering if when you do that kind of stuff, you have to worry about expansion rate of different species of wood. In a box, it probably does not matter because its a small box, but what if you do a table top like that?

-- Yves


6 replies so far

View Barbara Gill's profile

Barbara Gill

153 posts in 2123 days


#1 posted 06-15-2011 11:26 PM

Our staircase is walnut and pine. In face the walnut and pine are mitered. The staircase is 14 years old and the joints look as good as the day it was made. BTW there is no molding hiding the joints.

-- Barbara

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drewnahant

222 posts in 2552 days


#2 posted 06-15-2011 11:33 PM

I wouldnt worry about the expansion, but an endgrain joint is the weakest butt joint possible, I would consider a spline ( cut a groove in each board and span the two with a small strip, it is almost like tongue and groove, but only one cutting setup, and you can hide it if you dont cut to the ends) Tongue and groove or half-lap would also help if it doesnt interfere with the look of the box. oh, if you happen to have a biscuit jointer, that does the same thing as a spline, it’s just not real wood.

If you are tool limited, you can use dowels, doweling jigs are cheap, I just dont really like them because I have trouble aligning them well enough to avoid massive sanding.

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yrob

340 posts in 3115 days


#3 posted 06-15-2011 11:37 PM

Maybe I did not clarify what I am doing. I am going to dovetail the corners. However I am trying to make two boards with walnut—- pine—- walnut and two with pine—- walnut—-pine in order to produce a box with contrasting woods in the corners. So the joint between the two woods would not be the corner joints, they would be along the boards.

-- Yves

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drewnahant

222 posts in 2552 days


#4 posted 06-15-2011 11:47 PM

No, I get it, so you are gluing endgrain to endgrain to make a continuous board out of two species. My comment stands.

Edit: maybe you were talking to barbara, but a miter joint is essentially the same as far as expansion, endgrain to endgrain, though it gets its strength from the material it is wrapping around

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yrob

340 posts in 3115 days


#5 posted 06-16-2011 12:15 AM

Thanks for the explanations Drewnahant. I am using hand tools mostly, not powertools so no setup for me. I am going to go with your suggestion and just make a tongue and groove with my planes.

-- Yves

View Loren's profile

Loren

8302 posts in 3111 days


#6 posted 06-16-2011 02:36 AM

I think walnut and pine move at pretty similar rates.

Look at the U.S. Forestry Services Wood Handbook:

http://www.fpl.fs.fed.us/products/publications/several_pubs.php?grouping_id=100&header_id=p

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