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Author Topic: When is it too hot in temps for sinew backed  (Read 15700 times)

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Offline JW_Halverson

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Re: When is it too hot in temps for sinew backed
« Reply #105 on: February 11, 2021, 01:47:17 pm »
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Offline sleek

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Re: When is it too hot in temps for sinew backed
« Reply #106 on: February 11, 2021, 02:12:21 pm »
Wonder if he will just re-register as a new user and come back? He strikes me as the type of fellow to do such.
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Online Yooper Bowyer

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Re: When is it too hot in temps for sinew backed
« Reply #107 on: February 11, 2021, 05:33:20 pm »
Perhaps the simplest way to answer the original question is to measure the temperature at which dry hide glue melts.
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Offline bradsmith2010

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Re: When is it too hot in temps for sinew backed
« Reply #108 on: February 11, 2021, 06:04:41 pm »
that sounds very reasonable,,
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Offline Deerhunter21

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Re: When is it too hot in temps for sinew backed
« Reply #109 on: February 11, 2021, 06:08:52 pm »
I don’t even think you have to measure the melting point. Just when the hide glue gets soft enough to slip and move and so forth.
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Offline sleek

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Re: When is it too hot in temps for sinew backed
« Reply #110 on: February 11, 2021, 06:15:59 pm »
Bind two pieces of wood with hide glue and put an alignment mark. Attach a hook to each end and a scale. Start pulling. increase the temp of them using a heat lamp or some electric oven until they slip under x amount of pressure.
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Online Yooper Bowyer

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Re: When is it too hot in temps for sinew backed
« Reply #111 on: February 11, 2021, 06:18:44 pm »
Good point Deerhunter.

I don't think the lamp would heat the glue line uniformly. 
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Offline sleek

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Re: When is it too hot in temps for sinew backed
« Reply #112 on: February 11, 2021, 06:49:59 pm »
Quote from: tradcraftsman on February 11, 2021, 06:18:44 pm
Good point Deerhunter.

I don't think the lamp would heat the glue line uniformly.

Use two thin strips and a laser thermometer. They don't need to be big thick strips.
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Offline willie

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Re: When is it too hot in temps for sinew backed
« Reply #113 on: February 11, 2021, 07:01:58 pm »
hide glue gels at first and can be easily reformed with gentle heat.   as it looses moisture, it is said to dry, and becomes more brittle.

not sure if there is a clear transition between gel and dry,  maybe just a moisture content thing, as it can be softened again by wetting
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Offline PatM

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Re: When is it too hot in temps for sinew backed
« Reply #114 on: February 11, 2021, 07:21:03 pm »
It needs heat to get back to gel stage after wetting.  If you soak glue granules they do not gel just from moisture.
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Offline JW_Halverson

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Re: When is it too hot in temps for sinew backed
« Reply #115 on: February 11, 2021, 07:45:57 pm »
Perhaps two strips of wood 12 inches long, each an eight inch thick. Glue them together with hide glue and allow to cure for a month or more.

Heat in an oven to desired temp, then bend? 

Frankly, with my experience in leaving sinew backed bows in vehicles in the sun, if this is fully cured, you are not going to see much of anything happening.


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Offline sleek

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Re: When is it too hot in temps for sinew backed
« Reply #116 on: February 11, 2021, 08:43:56 pm »
Thats where I been leaving my most recent sinew bow. Sitting on the dash.
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Offline Deerhunter21

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Re: When is it too hot in temps for sinew backed
« Reply #117 on: February 11, 2021, 09:32:04 pm »
heres my question, is hide glue easier to seperate by using a sheering force (up and down) or pulling the two glued pieces straight away from each other?
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Offline PatM

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Re: When is it too hot in temps for sinew backed
« Reply #118 on: February 11, 2021, 09:37:07 pm »
Quote from: Deerhunter21 on February 11, 2021, 09:32:04 pm
heres my question, is hide glue easier to seperate by using a sheering force (up and down) or pulling the two glued pieces straight away from each other?

http://www.wag-aic.org/1990/WAG_90_buck.pdf
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Offline StickMark

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Re: When is it too hot in temps for sinew backed
« Reply #119 on: February 11, 2021, 10:26:31 pm »
From PatM's attachement

"This is particularly pertinent given that liquid hide glue is not recommended for conditions of display or storage where the RH regularly exceeds 70%."

Some might say "obviously", but this post really answered some questions about a what a primitive bow for Arizona's summer season might look like.  The high heat seems to be a non-issue. Good.

The possibility of constant afternoon storms, followed by wet, humid nights, is another issue.
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