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Tim Allen

Member Since 04 Dec 2014
Offline Last Active Today, 04:40 AM

Posts I've Made

In Topic: Community Studio - Classes Vs Membership Structures/business Models

20 April 2017 - 06:28 PM

John, It is apparently organized as a corporation: http://www.fireartsa...m/about-us.html

In Topic: Firing The Anagama This Weekend... Will Be Away

17 April 2017 - 11:52 AM

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In Topic: What Glue Should I Use?

10 April 2017 - 07:53 PM

re: roughing up the surface -- epoxies like WEST system create a mechanical bond and need some way to get a grip on the surface, thus rough sanding or scratching an otherwise smooth surface -- to give it "tooth"

In Topic: Old Kiln - Unknown Max Temp

07 April 2017 - 08:50 AM

Yeah, my comparative analysis doesn't address what the max temperature is that the kiln materials can withstand (the "do not exceed" threshold), only whether you've got enough heating power to get there....

In Topic: Old Kiln - Unknown Max Temp

06 April 2017 - 06:36 PM

OK, here's a quick calculation.... heat is lost from the kiln essentially as a function of the surface area of the chamber, at a rate that is determined by the insulation (e.g. thickness of the brick as well as what kind of brick).  Your kiln (assuming a rectangular volume 17.5"wide  x 17.5" deep x 13.5" high) has a surface area of 1557.5 square inches.  At 4800 watts heating power (20 amps at 240 volts), that works out to just over 3.08 watts per square inch. (if your kiln is round, 17.5 diameter by 13.5 high, then your surface area is 1222.6 square inches, which means you've got 3.93 watts of heating power per square inch).


Our Gare 2318 (round kiln 23" in diameter, 18 inches deep) has a surface area of 2130.5 square inches. It is rated at 7200 watts heating power (30 amps at 240 volts), so that works out to 3.38 watts per square inch. Our kiln is made of standard 2.5 inch brick. We understand ours is supposed to be able to achieve cone 6, but we only use it for bisque so don't know how high it can actually go (we got it 2nd or 3rd hand).


So if your brick is similar (2.5 inches), I would guess that the "should be capable of cone 6" advice is probably close....