Author Topic: very strong glue  (Read 7364 times)

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Offline Prarie Bowyer

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Re: very strong glue
« Reply #15 on: December 09, 2012, 02:16:44 pm »
Where does this idea that traditional hide glue is the strongest come from? Hide glue IS very strong and versatile and it really is the best for sinew but there are plenty of stronger and even more versatile glues out there.
 You are probably going to have to go with what you can get. I would recommend DP 460 from 3M but you might not be able to get it and it is extremely expensive.
 The G2 is likely more readily available. T-88 from the same manufacturer is also outstanding.

I didn't save the link naturaly becasue I dind't expect to get into an accademic argument.  There was an analysis of the various strength measurements of glues done.  The old hot hide glue came out on top.  It may have been lower (slightly) in some individual measurement like torque or shear... I dn't know.  I just remember being blown away thinking that my precious TBIII was bested by technology that existed for thousands of years.


Offline PatM

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Re: very strong glue
« Reply #16 on: December 09, 2012, 05:41:03 pm »
It's not really academic if we put the discussion into practice. Torque and sheer are very important in a glueline subject to typical bow forces.
 We rarely see glue tested in the lab in a bowbuilding context which is why those links that "prove" hideglue is the strongest have to be taken with a grain of salt.
 Here's a link to some non bow tests that show some comparisons in a variety of glues. http://www.oldbrownglue.com/pdf/HowStrongisYourGlue_FWW.pdf

Offline vinemaplebows

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Re: very strong glue
« Reply #17 on: December 09, 2012, 08:05:23 pm »
I like to let the glue start to set a little before application (2-part epoxy) I won't apply when runny. Thanks for the link.

VMB
Debating is an intellectual exchange of differing views...with no winners.

Offline Gordon

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Re: very strong glue
« Reply #18 on: December 09, 2012, 08:11:54 pm »
I noticed that also Eric. Unibond-800 looks like Urac-185 except with a different name.
Gordon

Offline PatM

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Re: very strong glue
« Reply #19 on: December 09, 2012, 10:28:25 pm »
I like to let the glue start to set a little before application (2-part epoxy) I won't apply when runny. Thanks for the link.

VMB
A better trick is to at least prime your surfaces with the freshly mixed glue and then add a coat when it starts to thicken  before finishing your glue-up.
 Some woods like to drink up a larger amount when initially applied.

Offline JW_Halverson

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Re: very strong glue
« Reply #20 on: December 09, 2012, 11:38:57 pm »

[/quote]

 Some woods like to drink up a larger amount when initially applied.
[/quote]

Thirsty wood starving a glue joint is a sure cause of failure, Pat.  With hide glue, I do like to size the wood with the glue first and let it cure out completely.  Make sure to lightly sand before the next glue application, though. 
Guns have triggers. Bicycles have wheels. Trees and bows have wooden limbs.

Offline bow101

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Re: very strong glue
« Reply #21 on: December 10, 2012, 12:52:10 am »
   Rather not mention any other glues other than water based TB, hide glue etc....etc..... I have heard nothing but good stuff about G-2 and it's readily available almost everywhere. Many Bowyers are using it for laminating.
"The privilege of a lifetime is being who you are."  Joseph Campbell

Offline vinemaplebows

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Re: very strong glue
« Reply #22 on: December 10, 2012, 01:36:52 am »
Yes, Pat I do that as well, did not mention it good point.
Debating is an intellectual exchange of differing views...with no winners.

Offline BowEd

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Re: very strong glue
« Reply #23 on: December 10, 2012, 09:59:50 am »
Hide glue and smooth on epoxy is what I use.Both are plenty plenty strong for bow making of various different applications of forms.
BowEd
You got to stand for something or you'll fall for anything.
Ed

Offline Onebowonder

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Re: very strong glue
« Reply #24 on: December 10, 2012, 01:44:26 pm »
Nelson claims that this Unibond 800 is even betterer than their old Urac 185 product.  We'll see. 

I did ask specifically if you could still use the Ammonium Chloride trick to get a "clear" version of the glue, and they told me that you can.  You'll want to play around with your ratios till you get it right, but it should work just fine.

OneBow

Offline Bernhard Langbogen

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Re: very strong glue
« Reply #25 on: December 10, 2012, 03:27:29 pm »
With this glue was glued the wooden propeller from the Airplanes in the 1 WW.
It's water resist

BINDAN-P HOLZLEIM Propellerleim
« Last Edit: December 10, 2012, 04:17:44 pm by Pat B »