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Member Since 10 Nov 2010
Offline Last Active Aug 19 2015 12:18 PM

Posts I've Made

In Topic: Clay Contamination Or Something Else? (Long)

13 August 2015 - 01:29 PM

Make a thin thin slip out of the clay and sieve it through as many grades of sieve as you have.

Sounds like a porcelain grog is in the clay.

In Topic: Varying The Thickness On Test Tiles To Produce A Slow Cool.

28 July 2015 - 07:30 AM

It might also be possible to make a box on your kiln shelf out of hard fire brick. Place the thicker slow cool tiles inside this box and the thermal mass of the hard brick box should cool much slower than the rest of the kiln.

Just be sure to put cones in the box too.

In Topic: Need A Cheap Simple Clay Body Recipe

22 May 2015 - 11:29 AM

Look up an article called" body building for potters".

I see BOTH sides of this issue. I love using local resources and Harry Davis is A hero of mine But you have also been given some great advice and info about the pros and cons of making your own clay.
Ask this. "How much clay can i make in an hour vs how many dollars worth of pots in the same time?" I'm not trying to discourage you but the advice given against is valud and the cons stated are too. Worth considering.

That being said i agree with the idea that we should add to your stated goal of mixing a good clay and with that in mind...

The granite" dust" you have access to sounds like it is really granite sand and while chemically it is FAR superior and less variable than the other sand i think the particle size may be a bit large.

Have you done a sieve analysis on the granite to check the particle distribution?

I can't imagine throwing clay with grains that large.

Sounds like you also need to find a copy of Harry Davis book. "A Potters Alternative" an maybe start with the vibrating sieve project.

Good luck, keep testing the absorption, glaze fit, and shrinkage, and please keep us informed. Sounds like an interesting project to me. Im jealous. I live a long, long way from suitable fluxes for clay bodies.

In Topic: Your Variations On Leach Clear

22 May 2015 - 10:23 AM

You might not want to remove the kaolin. This gaze can settle out pretty hard due to the amount and type of clay content. I usually add some white firing bentonite and epsom salt to help keep it from hard panning.

In addition, the clay content is keeping the glaze from being too runny at temp. Without the clay it might run off the pot onto the kiln shelves.

The ochre might act as a flux making the glaze more fluid on top of that.

Try a line blend adding the ochre.

Another couple of oxides i have enjoyed playing with are combinations of rutile or titanium and iron.

I did a whole series of tests with each in varying amounts from 0%-8%.

My favorites were the 2-4% range.

Mix a big batch with no colorants Split this into three containers.
Add 8% iron to one and 8% rutile to the other and do volume measured blends.

In Topic: Asian Style Teapot Strainers

13 March 2015 - 07:36 PM

Hmm, I see a golf ball and a trip to the hobby store in my future.

Thank you!