Breadboard ends, tenon length?

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Forum topic by Tabletop posted 01-03-2017 09:46 AM 1232 views 0 times favorited 6 replies Add to Favorites Watch
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138 posts in 987 days

01-03-2017 09:46 AM

Building a walnut conference table, 8/4 boards that will have breadboards on each end. They will be 8” wide. I usually have 6” boards and go 3” on mortise and tenon. What is your opinion on these 8” wide boards and the appropriate depth and length of the mortise and tenon. I know there is probably a “general rule” just wanted your opinions…

6 replies so far

View BenjaminNY's profile


134 posts in 1642 days

#1 posted 01-03-2017 10:58 AM

2 inches deep by 3 inches long into a piece of 8 inch wide stock sounds borderline for a conference table.

But given that the tenon will be how thick, 4/4 ? If someone decides to sit on the end of that table I feel like it might flex.

I would make the tenon longer but the best solution is do a test plank and see how much it flexes.

It’s not being used as a kitchen table with children around so at least that works in your favor.

View Tabletop's profile


138 posts in 987 days

#2 posted 01-03-2017 11:30 AM

In 2” stock I usually make the tenon an inch thick. So you think mortise and tenon should be at least 4”?

View BenjaminNY's profile


134 posts in 1642 days

#3 posted 01-03-2017 12:18 PM

Honestly I would do a test. I don’t think it would break either way but you dont want a squeaky/flexing sound if someone puts all their weight on the edge of the breadboard.

Also if you look at most bread boards, the tenon goes almost entirely through to the far edges

View rwe2156's profile


3232 posts in 1721 days

#4 posted 01-03-2017 04:14 PM

I’m worried about when that 350# guy leans or sits on the end of the table.

If you gotta have 8” I would make sure the apron extends to within 4” of the end and/or make the tenons 5-6” long with 2” tongue in between.

-- Everything is a prototype thats why its one of a kind!!

View bondogaposis's profile


5153 posts in 2591 days

#5 posted 01-03-2017 04:19 PM

If you narrow up the breadboards, you will reduce the amount of leverage that could be applied to them, and reduce the need for long tenons. For 8” breadboards I would go with at least 5” tenons.

-- Bondo Gaposis

View Tabletop's profile


138 posts in 987 days

#6 posted 01-03-2017 09:22 PM

Breadboard width is set. The interior designer will not have it any other way. Table is 14’ by 4’. In her eyes anything smaller wouldn’t fit such a large table. Honestly for what they are paying I’ll make it work that is why I’m asking lol.

So right now I’m thinking make tenons 6” long and an inch thick. Or, if this makes any sense, a fake and just half lap it. Leaving end solid and about two inches solid on the sides. But secure it like you would any other breadboard allowing for movement. ???

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