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Member Since 01 Apr 2010
Offline Last Active Aug 27 2013 12:40 PM
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Posts I've Made

In Topic: First Test Pieces - Glaze Not Glossy

24 August 2013 - 06:20 PM

Thanks for weighing in, everyone. :)

 

Looks like I need to try Cone 6. 

 

I'm a little confused regarding the cooling though. One person suggested I cool faster, while others are suggesting ways to cool slower (with the fiber blanket).  :unsure:

 

It always depends on the glaze. The person who suggested cooling faster is probably right if you're trying to get glossy clear. For some glazes, especially mattes, slow cooling is better. For some, super slow cooling is best. Some potters use incredibly complicated holds and ramp downs for cooling saturated iron glazes. The only way to find out what works best is by testing.

 

Jim


In Topic: First Test Pieces - Glaze Not Glossy

24 August 2013 - 09:33 AM

I have a small test kiln that loses heat pretty fast. I bought enough 1 inch Kaowool blanket to put a couple of layers across the top of the kiln. This did slow down the heat loss. It also helped improve the ramp up to cone 6.

 

It seems common sense to assume that more heat is escaping through the top of the kiln, but that is not the case. All else being equal, just as much heat is escaping through the sides and bottom so it would help just as much to put a layer of kaowool under the kiln as on top of it.

 

Jim


In Topic: New Regs On Silica Dust

24 August 2013 - 09:23 AM

There is no reason for potters to get paranoid.

A bit of common sense is all that is necessary regarding dust.

We have dwelled on this topic before.

 

The workers that are affected are primarily those in construction (90%)

"... during work with stone, concrete, brick or mortar. It can occur during sawing, grinding and drilling and is common in glass manufacturing and sand blasting".

 

Furthermore the rules are just a proposal at this stage. In the USA.

 

Now go ahead and stone me for warning against paranoia in the potters studio,

I just hope a bus does not hit you when you cross the road.

 

Thank you for the above post.

 

Jim


In Topic: Cone 5 B-Mix

22 August 2013 - 06:41 PM

Along with other clays, I use B-Mix 5 (which is really a cone 6 clay), B-Mix 10, and B-Mix Woodfire and have not had problems with cracking. It is unlikely, but possible that both of you got a bad batch of B-Mix 5. Laguna sometimes screws up their clays. I got a bad batch of Frost 5 once and had to go to great extremes (adding a little paper) to fix it and warned lots of people away from Frost because of cracking only to discover when someone here pointed out to me that she had just made a complete dinner set out of Frost with no cracking problem, that I had bought a bad batch of Frost.

 

Jim


In Topic: New Home "studio"

22 August 2013 - 06:32 PM

 

Just because it is rated as a cone 10 kiln doesn't mean it will be practical to fire it to cone 10. It may have been able to reach cone 10 when new but not now or not in a reasonable time. Even if the kiln will get to cone 10 in a reasonable time it is still, unless you have some good reason for firing to cone 10, not a good idea to fire that high.

 

Jim

Pfff, nonsense Jim!  Crank that baby up to "11"!

 

Hmmmm....that would be a great idea for a ceramic related poster and/ or t-shirt.

 

 

Fat chance that her kiln will get to cone 11. Somebody who wood fires to cone 13 with us has a t-shirt that says, "Cone 13"... BTW, which do you mean would make a good T-shirt "Crank that baby up to 11!" or "Pfff, Nonsense Jim!"?

 

Jim