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Addressing wood movement

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Forum topic by BB1 posted 04-02-2016 02:28 AM 729 views 0 times favorited 25 replies Add to Favorites Watch
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BB1

486 posts in 311 days


04-02-2016 02:28 AM

I am working on pulling together plans for a serving tray based on a project I saw on Woodsmith. The plan is to use alternating 2 inch slats of walnut and aspen for the tray floor that are held in dados in side walls. I have typically used plywood in dados (and thus no thought to wood movement). Trying to determine if I need to be concerned with wood movement when using wood slats held in the dados…and would that impact wood length or width (or both) when the dimensions of the slats are not long.


25 replies so far

View conifur's profile

conifur

955 posts in 615 days


#1 posted 04-02-2016 02:58 AM

Dont worry about it, over thinking!!! I never do even on wide boards when finish is on it, may be if you life in FL and no AC!!!!!!!!!!!!

-- Knowledge and experience equals Wisdom, Michael Frankowski

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BB1

486 posts in 311 days


#2 posted 04-02-2016 03:20 AM

I tend to overthink (too new at this and always seem to make various little errors along the way…which end up as “design features”). Reading too much likely! Making this for a little thank you gift and didn’t want it to split apart down the road.

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runswithscissors

2187 posts in 1488 days


#3 posted 04-02-2016 03:30 AM

Length will not be impacted, but width is very likely. If you can leave the slats a bit loose in the dadoes, you should be okay.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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BB1

486 posts in 311 days


#4 posted 04-02-2016 03:34 AM

So to be on the safe side, no glue or only a bit on the center of each end would be suggested?

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JBrow

818 posts in 383 days


#5 posted 04-02-2016 03:43 AM

BB1,

I always worry about wood movement of captured solid wood panels in a frame. Cutting the panel so that wood movement can be accommodated is a good insurance policy against a failure down the road. Applying finish to all six surfaces of the panel before assembly should work to minimized any wood movement in the panel. The panel will expand across its width (the smaller the width the less movement) much more than along its length and expansion across the width of a small panel with finish on all six side would be small. The expansion of a panel sized for a typical serving tray would be extremely small (probably negligible) along its length.

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conifur

955 posts in 615 days


#6 posted 04-02-2016 04:10 AM

You guys are overly nuts on wood movement. Periniod!!!!!!!!!!

-- Knowledge and experience equals Wisdom, Michael Frankowski

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jerryminer

528 posts in 905 days


#7 posted 04-02-2016 09:00 AM



You guys are overly nuts on wood movement. Periniod!!!!!!!!!!

- conifur

Really? Do you think it doesn’t happen? Ask this member:

(from this post)

Failure to allow for wood movement is the #1 cause of failure in wooden objects, IMHO.

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BB1

486 posts in 311 days


#8 posted 04-02-2016 11:54 AM

Thanks everyone for your comments and suggestions. Always more to consider and in this woodworking journey!! I learn something with each project. Love LJ and all the info I pick up from the forums and projects. A real treasure of info that is being shared. Thank you.

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JBrow

818 posts in 383 days


#9 posted 04-02-2016 04:41 PM

BB!,

Your idea; a dab of glue at the center on each end and none on the long grain edges would be my approach to keep the captured wood from rattling around in the dado while allowing it to expand and contract across its width. The panel would need to be centered in the frame leaving space along both edges for expansion.

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BB1

486 posts in 311 days


#10 posted 04-03-2016 02:11 AM

Plans continue, pieces cut, and blind dovetails done (thanks to my husband’s handiwork). Will be moving forward with details and hope to have a great final project to post!

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conifur

955 posts in 615 days


#11 posted 04-03-2016 02:27 AM

You guys are overly nuts on wood movement. Periniod!!!!!!!!!!

- conifur

Really? Do you think it doesn t happen? Ask this member:

(from this post)

Failure to allow for wood movement is the #1 cause of failure in wooden objects, IMHO.

- jerryminer


Its a miter joint, with what to attach it, some glue on miter joint? not the same as a what is being discussed here. Maybe a spline would have helped, there lack of jointery knowledge caused that problem. Not leaving any free space on the checkers to float in the frame. His lack of wood working knowledge.

-- Knowledge and experience equals Wisdom, Michael Frankowski

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jerryminer

528 posts in 905 days


#12 posted 04-03-2016 04:32 AM


You guys are overly nuts on wood movement. Periniod!!!!!!!!!!

- conifur



... lack of jointery knowledge caused that problem. Not leaving any free space on the checkers to float in the frame. His lack of wood working knowledge.

- conifur

Exactly! There needs to be space to allow for wood movement—( expansion of the checkerboard portion pushed that miter open—the wood movement is obvious)

Wood movement is real, and needs to be planned for. It’s not “nuts” to do so.

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jerryminer

528 posts in 905 days


#13 posted 04-03-2016 04:35 AM

BB1—

If the tray bottom will be individual slats, with space between, then you’re good—the length of the slats won’t change and the spaces will absorb the expansion in width.

But if the plan is to glue the slats together into a single, solid bottom, then expansion room would be wise.

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BB1

486 posts in 311 days


#14 posted 04-03-2016 12:16 PM

JBrow – my slats fit pretty snug in the dados so a little glue should be all I need. Thanks for the continued help.

jerry miner – I don’t plan to glue all the slats into a single panel as they seem to be held nicely in the dados. I may knock off the edges with my router to give a little depth but am still debating. I plan to just place the slats next to one another with a little “breathing room” at the ends by the carrying handles (I did not put dados there) so hopefully that will give expansion room as you suggested. Thank you for your help.

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splintergroup

828 posts in 686 days


#15 posted 04-04-2016 02:25 PM

A quick look with an online wood expansion calculator shows that for generally worse case in moisture contend (change of 10%), your 2” wide slats will expand about 1/16” each. I like to use these calculators to get a rough idea of what to expect with unfamiliar woods or extra wide parts.

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