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Min

Member Since 31 Mar 2010
Offline Last Active Jul 25 2015 06:03 PM
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Topics I've Started

Glaze And Slip Casting

19 June 2015 - 09:23 PM

I came across a technique I haven't seen before where glaze is poured and swirled around inside a mould then slip is poured in after it. Anybody know anything more about this or is doing this? 

 

It's from this site: http://thedesignfile...-serene-series/

 

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Brand Identification

19 June 2015 - 03:32 PM

This is an offshoot from GEP's potterscast interview. 

 

Fairly simple and short pdf on branding from Paul Blais of The Potters Business Workshop.

 

http://thepotterscas...ntification.pdf

 

 


New Elements

19 May 2015 - 09:24 PM

I was doing some reading on Kanthal and came across the blurb below. After replacing elements I have always run the kiln empty up to around ^04 then shut it off but am wondering how significantly element life is improved if held for the 7 to 10 hours as recommended by Kanthal. Does anybody do this and have you found an increase in element life?

 

From the Kanthal Handbook, referring to their FeCrAl alloys (i.e. A-1 alloy):

 

"The durability of resistance alloys in air at high temperatures is greatly increased by an oxide surface layer formed by a reaction with the oxygen of the air. The protective nature of this oxide layer is proportional to its area and depth. Foreign matter usually interferes with the formation of the oxide layer, and this causes a reduced life. ... At high temperatures the protective layer of Kanthal materials consists almost entirely of aluminum oxide. This has a light grey colour and good chemical resistance. At temperatures below 1000oC (1832oF) the oxide layer has a dark colour since the aluminum oxide is impure."

In order to protect elements from the effects of harsh environments, it is very desirable to condition the elements, by pre-oxidizing them. This is accomplished by firing them to a temperature of 1050oC/1922oF and soaking for several hors, 7-10 if possible. The process is enhanced by allowing good air flow into the kiln - leave the peepholes open, or the KilnVent on. If you are doing reduction firings in an electric kiln it is desirable to periodically re-oxidize the elements, for best life expectancy. The results of element conditioning can be quite dramatic. It may not have much affect for normal, low temperature firings, but can be significant for harsh operating conditions."

 

 

 

 


Rolling Pins

12 May 2015 - 02:40 PM

Came across this site on Etsy for laser carved rolling pins. The larger ones are approx 2 1/2" diameter X 10" rolling surface. Nice to see some alternatives to the ones at potters supply stores. (there are 3 pages of designs, sets of small rollers plus the larger ones)

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Old Orton Controller

09 May 2015 - 03:40 PM

I just picked up a spare kiln. It's from Pottery Supply House (Euclids) and  has never been used. It came with an Orton Autofire controller. Very basic touchpad, the manual that came with it is dated 1993. Anybody use one of these controllers? I'm thinking of switching the touchpad to a Skutt or Bartlett one. Any thoughts? 

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