Reply by JBrow

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Posted on Breadboard tenon length on large breadboards

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1368 posts in 1250 days

#1 posted 12-31-2017 03:00 AM


I am a long way from being an expert on breadboards so I am not sure why the rule of thumb you cited exists. Absent this understanding, I agree that a 2-1/2” long tenon seems short for a 10” wide breadboard. But if the breadboard remains flat over time, 2-1/2” long tenons may be sufficient. My only concern is that tenons too short might cause the breadboard connection to fail should someone sit on the breadboard. I cannot say whether this is a real or imaginary concern.

The only problems I can foresee with longer tenons is chopping well-fitting deep mortises would be more difficult. Also a 10” wide board with long tenons that are pinned too far away from the table top/breadboard joint could cause the breadboard to crack. If pinned close to the table top/breadboard joint, then the breadboard could still expand and contract.

I assume there is a good reason for such a wide breadboard. If reducing its width is not practical, then ensuring the breadboard is quartersawn could at least reduce or eliminate cupping of the wide breadboard. I doubt that longer tenons could resist the forces associated with a cupping breadboard.

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