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a little glue testing

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simk:
 For some reasons I wanted to get away from 2k for my glueups and use white pva wood glue instead(D3). Alone the white wood glue has -according to the data sheets - a very short open time (10-20min) which will hardly allow me a careful glueup-process. I now decided to make a little test and glued 6 samples of wood blocks: 2 samples are glued according the manual....meaning put glue on the surface and immefiately press. 2 samples are smeared with glue but then pressed together only after open time of glue was clearly exceeded (25min). In addition, out of pure curiosity, I glued 2 samples with a rest of old, ready to use, fishglue.

I will later today try to shear apart the samples. As long as it breaks in the wood and not in the gluelines I will hopefully be fine with the bows also. I'm curious now 🤞

Del the cat:
I wouldn't use anything other than glues with a proven bow making track record.
Dunno what you mean by white wood glue ... hopefully not ordinary PVA.
Also is your test being done with actual bow wood or just some random pine lumber which probably will fail befor the glue line?
Del

simk:
 I know what you mean Del, thanks.
But I know more than one bowyer making bows with ordinary pva wood glue of D3 quality. There are many brands around, most famous is titebond.
Actual bowwod would have been better than pine 😅 but I made, long time ago, a trilam with a pine core too 😅
So this setup sure is not perfect, but at least semi-conclusive for me.
If its sucessful I will glue a bow as next stage. Any glue that is stronger than the surrounding wood will do its job. I dont mind if it fails in the end. I will not sell this bow but give it to the clubhouse for everybody to shoot...
Cheers

superdav95:
Interesting.  I did a similar test last year but with sturgeon glue. I think I used 8 test glue ups with pairs of scrap pieces of bow wood blocks.  I grooved them all as I would do for a bow lamination for horn.  This was home made sturgeon bladder glue and the results were very good. I wanted to be sure my glue was gonna hold before applying it to a bow naturally.   I think tests like this are great and what us bowyers should be doing more of.  Sometimes we catch ourselves getting stuck in “the way it’s done mentality” and can forget to think outside the box.  We should experiment as much as we can.  Every once in a while we stumble on something new that works and even an improvement on things.

 Keep it up!   

Dave

Eric Krewson:
I like tests like yours, no telling what the outcome will be but it will be interesting.

I have a friend who makes trilam bows exclusively and always uses TB3 with no problems, he even does heat corrections of his glue-ups without any delamination. He said he contacted the manufacturer and they told him the glue wouldn't turn loose until it reached 600 degrees (I think, my old memory fails me at times, the temp could be lower).

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