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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making.

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  #1  
Old 01-31-2016, 11:00 AM
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Andrew Garrett Andrew Garrett is offline
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Liquid Nitrogen Dewar

So, I am looking for an affordable dewar so I can do some cryo work on my high alloy stainless stuff.

How wide are the necks on those things?
They look very narrow--perhaps too much so for some of my designs.


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Old 01-31-2016, 02:35 PM
argel55 argel55 is offline
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Andy depending on bottle ,they go from 2 1/4 inches up to 3inches on the larger dewars.
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Old 01-31-2016, 02:47 PM
jmccustomknives jmccustomknives is offline
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They aren't cheap, for sure. You probably don't need more than a 20ltr unless you are planning on doing a lot of blades.
Be careful when purchasing a used one. they are insulated in part by a vacuum like a thermos. They can loose the vacuum by being moved around in a truck or just being generally abused. They are repairable, but it isn't cheap to have them sent of and the vacuum redone.
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Old 01-31-2016, 03:51 PM
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Cool. 2 1/4" will work for pretty much everything in my current design portfolio.

I will probably choose new based on that vacuum info (which I did not know). Thanks.


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Old 02-01-2016, 05:30 AM
jmccustomknives jmccustomknives is offline
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Also keep in mind the lid has a foam piece that extends down into the dewar. It's usually 6" long.
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