Primitive Archer
Main Discussion Area => Primitive Skills => Topic started by: Pat B on January 04, 2011, 04:47:57 pm
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My wife bought me a crock pot from the thrift store for $5. I was planning to use it to keep hide glue workable while doing a sinew backed bow. I filled the crock about 1/3 full of water, plugged it in and waited to check the temp. After an hour or so the water was 150deg(F). is that too hot for sinew? It was too hot for me to hold my finger in! :o
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thats pretty ht pat. you could just put the glue pot in the water and use it to heat .
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I have gotten hide glue too hot before and it shrivels the sinew up and makes it rubbery. You want the hide glue temp right at the point that you can still put your finger in it.
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I've read 140 was the perfect temp. Great find for you!
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Unfortunately this is a one speed crock pot. No temp adjustment.
I was going to have water in he crock pot and the glue is another container floating in the water.
I'll experiment and see how hot that gets. Might just have to use this crock pot for stews! >:(
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Pat, I've done it the way Jamie has. Just put it in the water when it starts to cool.
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That sounds like the way to go, Eddie. I got wood, shreaded sinew and water buf horn, now all I need is the cajones to start. ;D
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I read on several violin making sights that 140 is the perfect temp. You certainly don't want to get much hotter though.
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140 might be good for the glue but what about dipping the sinew into it.
I have a small aroma theropy crock pot I bought at wally world. I think David Knight told me about it. I used it with the last sinew backed bow I built but it would get too hot and shrivled the sinew as soon as it touched the hot glue.
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Just make sure that when you are done with the hide glue that you don't store it in the crockpot to dry out. I have had it attach itself to the glazed finish inside the pot and pull the glazing right outa the pot! Chipped the crap outa my pot making it useless!
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I dunno... 150 degrees sounds OK to me. Back when I was washing dishes I think the rinse temp was 180 degrees? Anyway, just do the "shrivel test".
This is one reason I switched to fish glue. ;D
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My crock pot has a low and high setting. With the lid off it's 135. On occassions when I had the lid on it to heat it faster, it would go to about 150 and shrivel the sinew. I usuall remove the pot from the metal cooker and set in on a towel while I"m sinewing. It will cool pretty quickly. But, I always test it with one small, single strand of sinew first.
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I tested this crock pot with the lid on it. I'll try without the lid and see. Thanks for the info guys.
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I've been thinking about this lately as well. What happens if you put one of those on a dimmer type switch?
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At 110 -115 protein begins to denaturate. If the temperature is to hot the sinew shrivels and is going to be part of the glue..... The glue is denaturated protein. I think a Temp between 110 - 130 is ok. More is to hot.
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I used the crock pot as a bouble boiler by floating another bowl with the glue in the water in the crock pot. Works well and doesn't get too hot in the time it takes to add a layer of sinew.
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A good rule I use is if you cant hold your finger in it then it is to hot
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Maybe to small, but what about a coffee mug heater...You can drink the coffee, so maybe not hot enough?
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Tim Baker wrote in the TBB I that 140 is a good temp for gluing wood or veg fiber and 120 is good for sinew or other animal materials.