glue strength

[PAULREVENKOJONES]

Shawn:

We've used cold hide glue in key bushings forever, it seems :-). With terrific results. We use Spurlocks sizing cauls, then the brass cauls from Pianotek for installation. 

Paul

"If you want to know the truth, stop having opinions" (Chinese fortune cookie)


In a message dated 06/11/07 23:58:36 Central Daylight Time, shawn_brock at comcast.net writes:
Hey William, 
thanks for sending this out.  I for one will look it up!  Your correct it 
will be a interesting read!  Brings to mind a question, have you or anyone 
elts used cold hide for key bushings?  I have just used hot hide but it 
seems cold hide would bee less messy.  Thanks again. 
----- Original Message ----- 
From: "William R. Monroe" <pianotech at a440piano.net> 
To: "Pianotech" <pianotech at ptg.org> 
Sent: Monday, June 11, 2007 8:02 PM 
Subject: glue strength 


> Hello List, 
> 
> Interesting reading in the most recent Fine Woodworking magazine.  The 
> editors tested the following glues: 
> 
> Type I PVA (Titebond III) 100% 
> Slow-Set Epoxy  99% 
> PVA Glue (Elmer's Carpenter's Glue)  95% 
> Liquid Hide Glue  79% 
> Hot Hide Glue  76% 
> Polyurethane Glue  58% 
> 
> The percentages are the average strengths of the various glues, relative 
> to the strongest glue (Titebond III).  These glues were tested for 
> strength using a bridle joint (picture one board with a slot cut into the 
> end, and a second board with a tongue that fits into the slot - boards at 
> 90 degrees to one another).  The tests were done for three different joint 
> fits: 
> 
> Tight, Snug, Loose 
> 
> The tests were done using the following woods: 
> 
> Oak, Maple, Ipe 
> 
> The glues were then ranked by averaging joint strength for all the 
> situations, and the results were enlightening.  I've listed them in order 
> of strongest to weakest above. 
> 
> Of particular interest to me were the results of Cold Hide vs. Hot Hide. 
> Based on Average strength, Cold Hide beat out Hot Hide glue (Cold Hide 
> rated 79% of the #1 glue's strength while Hot Hide rated 76%).  Hot Hide 
> apparently lost a lot of ground in the snug and loose Ipe joints, but the 
> editors remarked that they were "about equal." 
> 
> Worth the read, for sure. 
> 
> Enjoy, 
> William R. Monroe 
> 
> 
> 
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