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Bread board tenon ?

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Forum topic by JerryLH posted 11-16-2019 11:20 PM 282 views 0 times favorited 7 replies Add to Favorites Watch
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JerryLH

196 posts in 1872 days


11-16-2019 11:20 PM

Topic tags/keywords: question milling joining tenon length mortise tnon

Short version. My table top is 1- 3/4” thick. The width of the table top is 44”. Question 1 – How long & wide would/should the tenons be? Question 2 – Should there be a small void between the end of the tenon & mortise? General Question 3 – How many tenons would You make on such a bread board end? Thanks, I appreciate your feedback.

-- Develop your character -- for it becomes your destiny. Jerry - Mannford, Ok


7 replies so far

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gtrgeo

70 posts in 991 days


#1 posted 11-16-2019 11:40 PM

On a table I did last year I made the tenon the whole width minus ~1” on each end. I left 1/4” on each end in the mortise to allow for expansion. The only part of the tenon that is glued is the center. I left it long enough to go through the breadboard end and wedged it with a contrasting wood to add a little visual interest. I get around 1/16” of growthon each edge as the seasons change. So far it is holding up. I have done them in the past in similar construction without the through tenon. Used slotted holes in the tenon with dowels secured from underneath just shy of the top surface. This was something I believe I learned from Norm. Those have held up for better than 15 years.

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JerryLH

196 posts in 1872 days


#2 posted 11-17-2019 12:22 AM



On a table I did last year I made the tenon the whole width minus ~1” on each end. I left 1/4” on each end in the mortise to allow for expansion. The only part of the tenon that is glued is the center. I left it long enough to go through the breadboard end and wedged it with a contrasting wood to add a little visual interest. I get around 1/16” of growthon each edge as the seasons change. So far it is holding up. I have done them in the past in similar construction without the through tenon. Used slotted holes in the tenon with dowels secured from underneath just shy of the top surface. This was something I believe I learned from Norm. Those have held up for better than 15 years.

I can understand how the center tenon is glued & wedged. What did you do with the outboard tenons? Are the wedged – does it allow for movement? Thanks – I really like the center coming all the way thru.

- gtrgeo


-- Develop your character -- for it becomes your destiny. Jerry - Mannford, Ok

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gtrgeo

70 posts in 991 days


#3 posted 11-17-2019 05:30 AM

Jerry, It is one continuous tenon cut back in length where it does not go through the breadboard end. I glued at the center where it goes through and the rest is floating in a continuous mortise.

George

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EarlS

3299 posts in 2908 days


#4 posted 11-17-2019 01:12 PM

Jerry – I was wondering the same thing when I was making a desk with breadboard ends. There are a number of articles out there on breadboard end. This might help – Breadboard ends - Woodcraft

Search “tenons for long breadboard ends” if you want to read more articles.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

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gtrgeo

70 posts in 991 days


#5 posted 11-17-2019 06:13 PM

One other thing I forgot to mention. You will want to create a slight cup in your breadboard end on the side which will face inward. This way the ends always stay tight to the shoulder on your table tenon. I found it easier to create this cup with hand planes prior to cutting the mortise.

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sras

5257 posts in 3690 days


#6 posted 11-17-2019 08:14 PM

Here’s a bit of a guideline…

You can adjust dimensions to fit the size of your table. I’d probably use 3 long tenons as in the picture and make them all about 1/2” thick.

Edit: I just realized that Earl’s link went to the same image! oh well…

-- Steve - Impatience is Expensive

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JerryLH

196 posts in 1872 days


#7 posted 11-18-2019 03:57 AM

Thanks to all for taking the time to help – I appreciate it.

-- Develop your character -- for it becomes your destiny. Jerry - Mannford, Ok

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