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Wyndham

Member Since 07 Apr 2013
Offline Last Active May 21 2015 06:14 PM
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Posts I've Made

In Topic: Manual Sitter Vs Digital Controller; Your Preference?

20 May 2015 - 01:06 PM

I think the key to a controlled firing in a digital controlled firing is to have each zone(as Neil touched on) controlled by it's own thermocouple. One T/C in the middle can not give the control that 3, each in it's own zone can do.The other factor is to make sure the T/C is in good working shape and change it out as it begins to show problems. Have witness cones in each zone to know what the heat work is doing.

Kiln sitter will age out and sometimes fail to shut off, I've had at lest 3 go out over 20 years on different kilns, causing over firing

Stuff happens manual or digital

Wyndham


In Topic: What Is Wrong With This Recipe?

05 May 2015 - 08:13 AM

I hope you did not misinterpret, calcine the EPK not the colemanite 

Wyndham


In Topic: What Is Wrong With This Recipe?

04 May 2015 - 05:45 PM

You might try calcining some EPK which means in your next bisque firing put a bowl full of EPK in the bisque. clay and gertsley borate sometimes bond together and fall off the pot.Calcining the epk and using 5% epk and 5% calcined epk will help, maybe enough to solve the issue. I'd also cut the gertsley down and add back a frit like 3134. There are several glaze calc online free programs that will help you balance it out.

Just a guess but cut the gerstley to 10% add 11% 3134 and decrease the silica by about 3%.

I don't have a program in front of me so this is just a wild guess.

Hope this helps

Wyndham


In Topic: Burner Placement In Kiln Design

28 April 2015 - 07:48 AM

Thanks to all for the info, I get to work on it bit by bit as time allows.One of the reason for not putting the burners under the kiln is not being able to easily get down to light them.

Thanks, Wyndham


In Topic: Insulating Kiln Wall/floor Interface

26 April 2015 - 11:20 AM

It might be possible to get some scrap kaowool and wedge in in with a putty knife or some thing like that. The kaowool won't harm the elements.

Wyndham