On 10/3/2011 5:06 PM, dpb wrote:
On 10/3/2011 12:38 PM, SonomaProducts.com wrote:

see pins in both sides of the joint. One of my gripes with floating
tenons is that unless you do pin both sides it does not have the same
mechanical integrity asa pinned traditional M&T joint.

I recall FWW did a mechanical destruction lab test(+) a number of years
ago. W/O looking it up, my recollection is that the difference was
essentially noise; it certainly wasn't any major difference.

Exactly:

1. Half Lap = 1603 lbs to failure
2. Bridle = 1560 lbs
3. Splined Miter = 1498 lbs
4. 3/8" M&T = 1444 lbs
5. 3/8" Floating Tenon = 1396 lbs
6. Miter = 1374 lbs
7. 3/8" Wedged M&T = 1210 lbs
8. 3/8" Pinned M&T = 1162 lbs
9. 5/16" M&T = 988 lbs
10. Beadlock = 836 lbs
11. Dowelmax = 759 lbs
12. 1/4" M&T = 717 lbs
13. Pocket Screw = 698 lbs
14. Domino = 597 lbs
15. Biscuit = 545 lbs
16. Butt 473 lbs
17. Cope & Stick = 313 lbs
18. Stub Teneon = 200 lbs

(+) They manufactured various joints from simple lap to full M&T in
their shop and took them to a uni lab (I want to say Case Western) where
the loading tests/measurements were done in one of their labs. It was
pretty well done as opposed to some of the writer-submitted homebrew
setups that often lack either control or decent measurement techniques,
etc., ...

Answers, in advance, to the next previous statements made in support of
the contention:

Depending upon the grain direction of the traditional tenon, a floating
tenon can be stronger.

Pinning the M&T joint actually made for a weaker joint.

Wood, properly glued, tends to fail at the wood and not the glue surface.

No glued joint will not last "forever".

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