Jump to content


Member Since 15 Mar 2013
Offline Last Active Today, 01:26 PM

Topics I've Started

Metal Frame For Sprung Arch Kiln

Yesterday, 12:46 PM

I still have to place the arch on my backyard kiln. But I need more help, please.

1. Do I need to brace the kiln edges with angle iron before I place the arch?

2. When I build the angle iron frame, do I snug it as close to the brick as possible or do I give it "wiggle room?"

3. Some designs use Springs to deal with heat expansion. Do I need this. My kiln outer dimensions are 47" wide x 43" deep with a 36" high stem wall. Does this the angle iron bracing?

4. All suggestion are appreciated.


New Crop Of Flutes. I Need Critiques

23 February 2017 - 04:17 PM

I just finished 10 new flutes. I am experimenting with glazes and clay bodies on the different flutes.  I just tuned these 6.  I would like your thoughts.  The tape ( red and black) is used to tune them. Eventually each with have an ornamental figure to replace the tape.


Can I upload a audio file of the flutes to the forum?




How Much Does A Refractory Castable Shrink On First Firing?

09 January 2017 - 03:09 PM

The sidewalls of my kiln project are built. The outside of the wall is 4" of hard brick and the inner liner is 4.5" of k26 IFB. The chamber is 30.5" wide x 25" deep x 24" high.

I had planned on making the arch as a monolith from a castable. But I worry that the castable will shrink too much during firing and collapse.

So here are my questions....

1. What is the percent shrinkage?

2. Would it be better to cast the arch in sections, like large bricks, fire the sections in another kiln, then assemble thems?

3. Or anybody know where I can get a good price on #1 arch bricks?


Very Cool Ulexite Oil Spot Glaze, Cone 6

30 August 2016 - 11:27 PM

I found a very nice oil spot glaze posted on Facebook by Clara Giorello.   She took a cone 10 oilspot glaze, "Daly's oilspot" and changed it to a cone 6 glaze by adding Ulexite.   I had not even heard of Ulexite before, so a google search taught me that Ulexite is a sodium borate mineral.  It is also known as Sodium Calcium pentaborate octahydrate.  It sounds like very cool stuff.  It forms complex crystals that refract the light.  It is known as "TV Stone."   It is similar to Colmenite without the Silica and alumina.  Gersley borate has a small amount of it.  Clara Giorello ground the mineral herself.


Her recipe is: cone 6


K feldspar           40

quartz                 30

Talc                     10

Kaolin                 10

Ca Carb              10



add:   RIO           10

          Ulexite       10.



I tried to find a supplier for Ulexite.  I found an import company that was willing to sell me a metric ton of the stuff.  Has anyone ever used this and by chance found a distributor?



My Kiln Build

29 July 2016 - 08:47 PM

I am finally getting around to build my kiln.  It will be about 16 cu ft in capacity.   the outer measurements are 43' x 43."

Here are the first pics from the project.   More will follow.