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Joined: Feb 2009
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I thought it was an interesting quenching strategy also. I'd guess if the technique is worked out, the only down side would be the crucible get eaten up by turning into scale relatively quickly.

I wonder if there's a difference between the Kingsford (or?) we might pick up here and BBQ charcoal available in England.

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I do not think scale is increased during the quench. Any scale forming on the crucible happens inside the kiln. I think the crucible being dunked as well will not hurt it.


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Originally Posted By: Demonwolf444
The crucible with the lid sealed on with the clay is submitted whole into the quench and swirled around. The pressure usually blows the lid off.


What happens when the internal pressure does not blow the lid off? Failure to get proper colors?

SRH


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the first result ( RTO tool ) the lid was only partially lifted by a few mm, the crucible cooled very quickly; as in by the time i had grabbed a screwdriver from 4 feet away it was cool enough to pry off. - The lid is never violently blown off and i introduce the crucible to the quench quickly and the box entering at something shy of 90 degrees the pressure seems to do the rest.

True the crucible does create a lot of scale and has a limited lifespan; my crucible is a steel tray made from bending some ~2mm sheet steel, its about 4 inches high by about 5.5inch square, its drawn onto the steel like a box packed flat, the lid is just a square piece of the same steel that sits inside the tray and is sealed in place by clay.

The biggest issue with the process is the BBQ charcoal, its of the "light in the bag" variety and im sure it has some parafin or something on it to help get it going, this finds its way out of the crucible - it would be an interesting experiment to see weather using special charcoal VS this BBQ stuff would yeild different results. I don't have the time or funds at the moment to conduct this as an experiment but may do in the future.

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Originally Posted By: SKB
I do not think scale is increased during the quench....

I think you're correct Steve. My thought was some of the scale is probably blown off in the quench. What I have noticed is when I dump my cover in with the rest of the quench material, it gets consumed relatively quicker than the crucible. Then again, I can't say I'm perceiving it correctly.

Thanks Demonwolf for your write up, follow up comments, and pictures.

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I have tried this exactly once - much the same as demonwolf - but more crude. My "crucible" was a bean can with the lid laid on top and not sealed. The kingsford was pulverized, the butt plate wrapped in wire and suspended in the can. My furnace was a Weber kettle grill and the quench was rainwater circulated with the garden hose. I had a helluva lotta fun and was pleasantly surprised. Hopefully the link will show a short video clip............
https://www.dropbox.com/s/tgl4101cc6y6yan/Backyard%20CCH.wmv?dl=0

Regards, Joe

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Joe, Looks pretty darn good, better than many. Must be some magic in that Kingsford charcoal.
Chuck

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Air got to the part

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I was permitted to run my first color case project last week at class. The candidate was a early Lefever G grade. 3:1 ratio of charcoal to bone is what they use, and a temp of 1400 for an hour and half. The drop is short, and into ice water. I addition to learning this process, I was required to mill some braces for the tang and side plate screw.

The pictures could be better; more vibrant in person with stronger blues.

https://drive.google.com/open?id=1bWHLOrLeks7yfCNsqOysR1vxnG1M2_eW

https://drive.google.com/open?id=1WGX8AxAZw5IU557BAxYePL-ciljPNQK_

https://drive.google.com/open?id=1vM3tBQDNjH3Rm8gQtU2nXO74l10y3-Cl

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WELL DONE!!!

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