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Back around 2002, Dan Hartman masterfully updated the 1984 electric furnace designed by David Gingery. In 2008, I stood on Dan's shoulders and attempted to improve on his design. Here is the result which has served me well.
If you are interested, please see
https://rick.sparber.org/modified%20...%20furnace.pdf
Your comments are welcome. All of us are smarter than any one of us.
Thanks,
Rick
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Thanks rgsparber! We've added your Electric Furnace to our Heating and Cooling category,
as well as to your builder page: rgsparber's Homemade Tools. Your receipt:
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Thanks Rick,
I love your PDFs. Have you ever looked a foamed cement? One day if people ever stop bothering me I need to build a furnace and I have seen a few people using foamed cement sealed with Waterglass as the insulator with very good results. I like the fact that it is easy to work with and castable.
Here is a link to a foam generator that works well: http://pelagic.wavyhill.xsmail.com/
I don't have any background in cement but the paper is certainly interesting. I couldn't find a date so wonder when it was written and how have samples fared over time.Quote:
Originally Posted by NortonDommi
I know that mixing high temperature cement and perlite is a common procedure when making furnaces. It would have a similar outcome.
Thanks,
Rick
I have looked at foamed cement for use in raised bed planters. It my research says it is not very durable. I also know that Portland cement is not very heat resistant at the temperatures you may want in a furnace. At 1500˚F portland begins dehydrate. Hydration is the process that causes the cement solidify and to bind to the materials in concrete. Any prolonged temperatures about 1500˚ will destroy the cement.Quote:
Originally Posted by NortonDommi
I have this link bookmarked for when I get around to building a foundry furnace.
I ask have an old ceramic kiln, that I recovered from the trash, stored alone with my other "will get to it someday" stuff. It has lots of that soft fire brick heating elements and a nice stainless steel exterior that will be easy to reconfigure to a crucible furnace.
John
This sounds a lot like the RAAC concrete (currently starring in a huge scandal in Britain) https://en.wikipedia.org/wiki/Reinfo...rated_concreteQuote:
Originally Posted by NortonDommi