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How tall mortise/tenon can be.

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Forum topic by 716 posted 02-01-2016 04:10 PM 639 views 0 times favorited 11 replies Add to Favorites Watch
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716

502 posts in 381 days


02-01-2016 04:10 PM

In a glued application how wide the apron board can be before the wood expansion becomes a problem. Let’s say for hard maple material.

-- It's nice!


11 replies so far

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jeth

249 posts in 2302 days


#1 posted 02-01-2016 04:25 PM

Hello.. probably about 3 inches or so would be the limit before you would want to allow for movement, dividing the tenons and only partially gluing, as you get wider (think breadboard ends as an example) using pegs through slotted holes in tenons to secure etc.

They look like sliding dovetails(??) not straight tenons, if you’re worried you could just glue the top end or not glue at all in that case as the mechanical joint of the tail will stop them sliding out. Probably be best to glue at least an end so the legs can’t slide off!

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a1Jim

115202 posts in 3041 days


#2 posted 02-01-2016 04:35 PM

Jeth said exactly what I would recommend.

-- http://artisticwoodstudio.com Custom furniture

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Rick M

7921 posts in 1844 days


#3 posted 02-01-2016 04:44 PM

I made a table with a 4.5” apron, been ten years and no issues. Mahogany, which is pretty stable.

-- http://thewoodknack.blogspot.com/

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716

502 posts in 381 days


#4 posted 02-01-2016 05:17 PM

Thank you all. that was very helpful!

-- It's nice!

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bonesbr549

1176 posts in 2531 days


#5 posted 02-01-2016 05:23 PM

I would add that its material dependent as well. If the apron material is QS then movement will be greatly reduced and some species are more volitile than others. Tight grained woods would be the best. IMO. I’ve done aprons 6” no issues, however I follow a rule, and any cross grain situation exists I allow for some movement period.

-- Sooner or later Liberals run out of other people's money.

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pintodeluxe

4856 posts in 2277 days


#6 posted 02-01-2016 05:34 PM

A 6” wide piece of bigleaf maple will change dimensions by approximately 1/32” (depending on how it was cut) as moisture content changes from 6% to 10%. I usually use wide rails on side panels for bookcases and and the like. In those instance I may or may not split the tendon. That depends more on leg thickness than expansion / contraction. You can glue only the center of the tendon if you wish, but I think for board width < 6” in an air conditioned house, wood movement is negligible.

I haven’t had the occasion to make aprons wider than 4-5”, and have never had a problem. I use quartersawn stock though, which is usually more stable.

Clever tool for calculating mood movement…
http://www.woodbin.com/calcs/shrinkulator/

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

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hotbyte

842 posts in 2440 days


#7 posted 02-01-2016 05:55 PM

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Rick M

7921 posts in 1844 days


#8 posted 02-01-2016 06:41 PM

Results of the anvil test mentioned in the article linked above.

http://www.popularwoodworking.com/techniques/the_anvil_test

-- http://thewoodknack.blogspot.com/

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hotbyte

842 posts in 2440 days


#9 posted 02-01-2016 07:16 PM



Results of the anvil test mentioned in the article linked above.

http://www.popularwoodworking.com/techniques/the_anvil_test

- Rick M.

They really need videos of the anvil drops and splinters flying :)

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BinghamtonEd

2281 posts in 1834 days


#10 posted 02-01-2016 08:20 PM

I’ve done a 4” wide drawbored tenon in cherry on my daughter’s bed going on 2 years now and no signs of any issues.

-- - The mightiest oak in the forest is just a little nut that held its ground.

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Rick M

7921 posts in 1844 days


#11 posted 02-01-2016 08:53 PM



They really need videos of the anvil drops and splinters flying :)

- hotbyte

Matthias! Get in here!!

-- http://thewoodknack.blogspot.com/

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