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| WOODWORK - GENERAL A forum for ALL WOODWORKERS both professional and amateur to seek and give help, make observations and statements, etc. On anything to do with general woodwork and cabinet making.
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View Poll Results: Is a glued dovetail joint stronger than an unglued dovetail? | |
YES
|    | 15 | 93.75% | |
NO
|    | 0 | 0% | |
wots a dovetail?
|    | 1 | 6.25% | |
wots glue?
|    | 0 | 0% |
 | | 
29th Jul 2006, 05:41 AM
|  | Most Valued Member | | Join Date: Feb 2003 Location: Garvoc VIC AUSTRALIA
Posts: 13,122
| |  Is a Glued Dovetail Joint Stronger Than An Unglued Dovetail
Well Kiddies,
That's the question.
What's your opinion.
The answer is here http://www.amgron.clara.net/dovetail...ltestindex.htm |
29th Jul 2006, 06:07 AM
|  | Alien in a Strange Land | | Join Date: Jun 2006 Location: South Carolina, USA Age: 63
Posts: 2,499
| |
An interesting result. Of course, many of my dovetails are so slack that without glue the whole drawer would just fall apart. 
__________________ Cheers,
Bob
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29th Jul 2006, 07:02 AM
|  | Old Phart | | Join Date: Aug 2004 Location: Tasmania
Posts: 1,253
| |
Glued has to be stronger. pure physics.
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29th Jul 2006, 08:15 AM
|  | Cool dude | | Join Date: Oct 2001 Location: Warwick, QLD Age: 31
Posts: 3,738
| |
This is one interesting read. I do agree with Ernknot that theoretically glue should be stronger. Does anyone have any idea why the results were what they were?
__________________ Have a nice day - Cheers  |
29th Jul 2006, 09:00 AM
|  | Golden Member | | Join Date: Jan 2005 Location: Stratford, New Zealand Age: 48
Posts: 743
| |
Interesting.
But what they didn't test was repeditive loads. The unglued joins failed by deformation, the pins actually slid and compressed. That indicates there was movement before the actual failure. If that was repeated the join is going to work loose. The glued join failed suddenly when the faces of the pins sheared off, there would have been no movement before the failure.
So yes I can believe their results, but they aren't a real life test. You dont hook a winch to your drawer fronts and see if you can pull them off. Instead they get pulled and pushed 20 times a day untill they possibly work loose.
SO back in the real world I suspect the glued joints will actually last longer in service. 
Cheers
Ian |
29th Jul 2006, 09:30 AM
|  | MAd MetalMelter | | Join Date: Aug 2004 Location: wagga wagga Age: 40
Posts: 2,168
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Ermmmmm
.......................Flawed experiment. A glued dovetail is definately stronger!!!
REgards Lou:eek:
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29th Jul 2006, 09:59 AM
|  | The typo kign | | Join Date: Aug 2003 Location: Melbourne - Outer East Foothills
Posts: 7,066
| |
OK, today I'm going to build a picture frame and try unglued butt joints. That should be really strong.
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29th Jul 2006, 10:08 AM
|  | Super Moderator Electron Murderer | | Join Date: Aug 2002 Location: Melbourne, Victoria
Posts: 5,763
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How can you tell from the reference? They don't give any figures for load that the glued dovetail failed at, only that it was less for wide-angle glued dovetails. What load did narrow angled glued dovetails fail out? By inference, it was greater than the unglued ones. |
29th Jul 2006, 10:30 AM
| | Most Valued Member | | Join Date: Feb 2003 Location: Garvoc VIC AUSTRALIA
Posts: 13,122
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Quote: |
Originally Posted by Gumby OK, today I'm going to build a picture frame and try unglued butt joints. That should be really strong. | If'n yer stick it tergether with a coupla 3" nails at the appropriate angles then its dovetailed. Strong wifout any glue too. |
29th Jul 2006, 10:56 AM
| | . | | Join Date: Jul 2005 Location: Melbourne
Posts: 4,800
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To answer that just ask yourself if you would make someone a chest of drawers and just tap them in with no glue and then deliver it to them that way  |
29th Jul 2006, 11:08 AM
|  | Dissenting opinion | | Join Date: May 2005 Location: Turramurra, NSW
Posts: 2,360
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The test only applied force in a single, constant direction.
If lateral force or varied direction force was applied the results would have been diferent.
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Bodgy
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29th Jul 2006, 07:00 PM
|  | RIP - Gone, but not forgotten | | Join Date: Feb 2005 Location: East Bentleigh, Melbourne, Vic Age: 54
Posts: 4,786
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Quote: |
Originally Posted by echnidna | Hi Echidna,
Yep, I've seen that web page too, but note the date: 1958
Since then modern glues have come a long way, and now materially bond with the timber and itself (well, for the first glue-up anyway), so I'd still stay with my vote of glued D/Ts being stronger than a purely mechanical attachment.
__________________ Steve B File-aholic "Steve departed this life after a number of very successful years as a member of these forums, he will be sadly missed by all" - Woodworking Australia's Woodwork Forums - April 2007 |
29th Jul 2006, 09:26 PM
|  | Most Valued Member | | Join Date: Nov 2003 Location: Sydney Age: 40
Posts: 7,283
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Didn’t have the patience to read the whole thing. It was written in 1958 right? Please don’t tell me glue makes it weaker. |
29th Jul 2006, 09:30 PM
| | Most Valued Member | | Join Date: Feb 2003 Location: Garvoc VIC AUSTRALIA
Posts: 13,122
| |
I see there are many disbelievers on this forum
so
I
have
a
real
treat
for
you
all
they
are
having
a
recruitment
drive
just
for
other
non-believers http://www.alaska.net/~clund/e_djubl...rthsociety.htm |
29th Jul 2006, 09:35 PM
|  | Silent Achiever | | Join Date: Jul 2003 Location: Glen Innes NSW Age: 67
Posts: 591
| |  Non Matching
Hi all,
The two panels in the picture are not from a matched pair, please note the last tail so this could be bs.
I like the the idea of glued dovetail joints
Regards Mike | | |
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