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jrgpots

Member Since 15 Mar 2013
Offline Last Active Yesterday, 11:30 PM
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Topics I've Started

Frits: Too Many Numbers And Too Little Info

20 July 2014 - 09:52 PM

Does anyone have a brief list of the most commonly used frits and their uses, properties, and effects?

Jed

Would Olivine If Added To A Glaze Produce Green Flakes?

18 July 2014 - 01:51 AM

I have a good supply of olivine, a magnesium iron silicate also known as paridot. The Insight database calls it a refractory that melts around 2800F. Would olivine dust of about 40 mesh when added to a glaze result in green flecks?

Does anyone have any experiance with it? If not, I will post my test tile results.

Jed

Chimney Build

03 July 2014 - 09:41 PM

I am drawing plans for a 15 cubic ft sprung arch downdraft kiln powered by 2 power blowers. The walls will be 9" thick. The power blower inlets will be 4" diameter. The outlet flue and chimney will be 8 x 4 1/2 internal dimensions.

The first of many question:
1. How high does the chimney need to be?
2. Can the bricks above the damper be K20 or less?

Jed

Bon Ami Whiting/feldspar Ratio?

19 June 2014 - 04:53 PM

I have about 10 lbs of Bon Ami cleaner that we don't use anymore. I thought about using it in a glaze. It is made up of limestone (whiting) and feldspar. But I can't find in the public domain the ratio between the two. Before I do a line blend, I wondered if anyone here had done so. I don't want to reinvent the wheel...... Anyone know of the ratio in Bon Ami?

Jed

Clean Up After Reduction Firing

13 June 2014 - 06:57 PM

I have read a number of reduction schedules for downdraft kilns.  Many of the schedules include a "clean up Phase" (to smooth out surface inperfections) at the end of the firing just before the kiln is shut down and closed for cooling.  One schedule for a large kiln had a clean up of 1 hour while a smaller kiln only had a clean up of 30 minutes.

 

SO....I have a 3.5 cubic foot baby downdraft conversion kiln.  How long should my clean up phase last?... 15 minutes?

 

I'm getting excited to try my little kiln in reduction.  It will take me another week before I have enough bisque ware for firing.   Unlike so many of you, I am a "slow poke."

 

Jed