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perkolator

Member Since 08 Feb 2012
Offline Last Active Mar 02 2017 05:23 PM
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Posts I've Made

In Topic: Will Have To Stop Using Custer

02 March 2017 - 05:03 PM

Has happened before and will happen again with certain mined minerals.  Industry changes, the vein of mineral in the mine changes, etc, we get very little opinion or control if any.  If it weren't for industry mining these minerals for other purposes, we wouldn't even have access to them for ceramics - selling off part of their product inventory to some hobbyist ceramicists is not even a fraction of their income, so why would they change things according to our needs vs that of industry?


In Topic: Cracked Kiln Shelf

02 March 2017 - 04:49 PM

That's pretty much it -- but if you took more advantage of this method, you could likely fit several more plates on that shelf level.


In Topic: Uneven Temperature In Small Gas Updraft Kiln

02 March 2017 - 04:45 PM

I can't really tell from the pics, but it looks like your burner comes in horizontal, not vertical from the floor.  Where is your kiln's flue/exit/damper?  

 

Just like for those who make their own raku kilns from trash cans - many are finding the need to add an extended flue in order to get sufficient velocity/flow inside the kiln.  I can't explain exactly what happens here, but by venting more it somehow allows more efficient use of the heat energy produced.  So like your blacksmithing friend suggested - try extending the flue - perhaps some dry-stacked fire brick will work temporarily for testing purposes.

 

Take a look at this page, it will hopefully help explain: http://www.kilns.com...iringsystem.htm


In Topic: Cracked Kiln Shelf

02 March 2017 - 04:24 PM

What he's doing is "staggering" the height of bowl rims, since they're all the same general height - so he can place them closer together and fit more per shelf - very smart way to load.  People who are good at Tetris and puzzles excel at kiln loading!

 

The other method you got confused with actually used to be common in ceramics.  Example:  saggar fired ceramics used to be common when you had "dirty fuel" sources to fire your kiln.  Inside these saggars it was common to stack/cradle glazed bowls inside one another, to maximize your volume.  Since glaze obviously sticks to anything it touches, they would space the bowls apart with 3 small balls of wadding/clay to separate them - the balls would be under the clean foot ring of the top piece and they would clean a circle of glaze where it touched the inside of the bowl underneath - this way nothing sticks to glaze, its all clay-on-clay.  So if you see old Chinese ceramic bowls with 3 unglazed dots in the center, it was likely fired this way and very old.


In Topic: Cracked Kiln Shelf

01 March 2017 - 06:51 PM

Good idea, thanks. I have a wet tile saw I'll keep this in mind.

careful.  I've cut tons of tile in my life working for my dad, a regular tile wet saw is very underpowered to cut kiln shelves, a "brick saw" would be more appropriate and even then that's not really ideal since you're hand feeding it.  a lot has to do with the thickness of the shelves vs blade diameter and the power of the saw motor.  go VERY slowly and let the blade do its thing, or it will grab and suck it in.  clay kiln shelves are significantly easier to cut vs silicon carbide shelves.