Wood Joint Strength Test Comparison Videos - Router Forums
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post #1 of 25 (permalink) Old 09-22-2014, 02:23 AM Thread Starter
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Default Wood Joint Strength Test Comparison Videos

Hi all

While searching for 'how to use dowels in woodworking', I have found this:

Dowelmax Dowel Joint vs. Mortise & Tenon Joint Destructive Strength Test Results

Its very interesting and an information at least for me that Multiple dowels makes the strongest joints. I am sharing because I thought it might be an information for you guys as well.

Thanks
Obaid
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post #2 of 25 (permalink) Old 09-22-2014, 03:30 AM
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Quote:
Originally Posted by Carpenter12 View Post
Hi all

While searching for 'how to use dowels in woodworking', I have found this:

Dowelmax Dowel Joint vs. Mortise & Tenon Joint Destructive Strength Test Results

Its very interesting and an information at least for me that Multiple dowels makes the strongest joints. I am sharing because I thought it might be an information for you guys as well.

Thanks
Obaid
more reading on the subject...

Wood joint strength testing

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If only new layers hadn't been added....

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post #3 of 25 (permalink) Old 09-22-2014, 03:50 AM Thread Starter
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It shows that it depends on the application, as the results are different from the previous link.
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post #4 of 25 (permalink) Old 09-22-2014, 04:34 AM
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It shows that it depends on the application, as the results are different from the previous link.
true independent non-sponsored lab results are difficult to find...
more often than not the sponsor comes out looking pretty good...
search for wooden joint strength test and you'll find the results are all over the place...
keep in mind there are a bazillion variables to consider and factor in... doesn't seem possible to cover even half of them...

Fine Woodworking and Wood Magazine did very comprehensive test series - but you have buy the results unless you have the issue of their magazine....

I've always believed that M&T is the strongest of the bunch....
and I see/saw nothing to dissuade me...

"Wood Joint Torture Test" in WOOD magazine issue #173

Wood Joint Torture Test

Wood Joint Torture Test II

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post #5 of 25 (permalink) Old 09-22-2014, 05:39 AM Thread Starter
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true independent non-sponsored lab results are difficult to find...
Well that's a little frustrating
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post #6 of 25 (permalink) Old 09-22-2014, 08:38 AM
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Default Dowel joints are foul joints

All the Dowelmax tests show is that dowels have a high shear strength. They tell me nothing about the strength of the glue line between the dowels and the walls of the dowel holes (50% end grain). Nor do they tell me anything about the longevity of the joint when subject to seasonal changes in relative humidity. As a cabinet maker I'm interested in these characteristics. The attached photo makes my point. These two dowels were never subject to shear stress. I will use nothing but mortice and tenon (or slip tenon) joints. If you own a router it is dead easy to cut accurate mortices.

Denis Lock 'Routing with Denis'
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post #7 of 25 (permalink) Old 09-22-2014, 09:29 AM
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In my last post I did not make it clear that my photo is of a failed dowel joint (not a joint about to be glued).

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post #8 of 25 (permalink) Old 09-22-2014, 10:40 AM
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I used to do a lot of doweling but then got a hollow chisel setup and went to mortice and tenons. I think the tenons are a little stronger and I find them easier to fit. Multiple dowel holes were hard to keep aligned compared to a tenon. (I didn't have a dowel max.) With a tenon there are extra steps that can be taken to reinforce the joint such as wedging the end of the tenon or pegging the tenon with a cross dowel.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #9 of 25 (permalink) Old 09-22-2014, 01:22 PM Thread Starter
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I guess about the link i shared, its more about selling the product than the true story but don't forget they have used like five dowels to make a joint which may be a factor. A two dowel joint might not be as strong as those shown in the link.

I remember a few places where Mortise and tenon are accompanied with dowels to strengthen the joint.
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post #10 of 25 (permalink) Old 09-22-2014, 09:48 PM
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I hate dowel joints. If I had to use them Id give up woodworking. I can honestly say I gave my dowel drilling jig away 30 years ago and haven't drilled a dowel sense.

Not that I don't think they're fine. I just don't like anything about them.

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