Re: [MedievalSawdust] Unmedievally OT: Wood glue strengths, and woodworking links
- did you wet mating surfaces? the urethane glues rely on moisture to cure properly...--Alysaundre WeldonBarony of AdiantumKingdom of An Tir
On May 5, 2011, at 4:37 PM, Kean Gryffyth <kad.dsl@...> wrote:
I've not had good luck with Gorilla Glue. I stick to Titebond III,
unless I'm working in a particularly dark wood, in which case I'll use
Titebond II for dark wood.
On 5/5/2011 12:15 AM, Broom wrote:
> So, I'm building some cabinets, and tried to join them with Gorilla
> glue, hoping to simplify the process of assembly. Ignore the sense of
> that first idea, and let's get straight to the results...
> Some of the joints failed with minimal stress (moderate handling).
> Others seemed stronger, but I didn't give them a real shakedown. I've
> decided to back up all glued joint with brads. However, I was left
> wondering what went wrong...
> This site:
> ... reinforces the manufacturer's claims that Gorilla glue is very
> strong. The author suggests that Titebond 3 is the strongest glue of
> all, but the single-test failure differences are actually rather
> slight for the "first-tier" glues (Hot glue, Epoxy, and "Varnish as
> glue" were noticeably weaker).
> Nonetheless, I had joints fail when dropped a few inches onto cement,
> all on the glue line (no wood failure). These were end/long-grain and
> cross-grain joints. The joints were clamped for the recommended 30
> minutes (usually much longer), and cured for the recommended 24 hrs.
> The failure was from shock, not sheer force (the above webpage only
> tests sheer failures).
> So, any clues what went wrong?
> * Expanding polyurethane may be very sensitive to shock. Like glass,
> it may be strong, but brittle.
> * Maybe I didn't have enough glue. (But good lord, I tried! And had to
> clean most joints of excess.)
> * The garage was cool; this slows cure times. However, this wouldn't
> explain why some joints were strong and others weak.
> Someone recently asked for woodworking blog links, This site is pretty
> ' | Broom IAmBroom @ gmail . com
> ' | cellphone: 412-389-1997
> ' | 9370 Shadduck Rd, McKean, PA 16426
> '\|/ "Discere et docere", which means:
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> //|\\ to read our newspapers."