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 Post subject: grog size in your clay body
PostPosted: 15 Dec 2014, 17:51 

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I should like to know the percentage and number (extra fine/fine/med/etc), if any, the grog used in your clay bodies. And if you've time, information on the clay body used, its shrinkage and absorption would be appreciated


The love for our local shale is still present, but I not enamored with the difficulties necessary to process out of doors in the winter weather.


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 Post subject: Re: grog size in your clay body
PostPosted: 16 Dec 2014, 06:20 

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This is what I use. No grog

http://www.highwaterclays.com/index.cfm ... -c-5-6.cfm


Please visit by Facebook page so that you can stay updated on my progress.
http://www.facebook.com/spiritwind.ocarinas

My website http://spiritwindocarina.com/


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 Post subject: Re: grog size in your clay body
PostPosted: 16 Dec 2014, 13:06 

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wow, a stoneware clay body....you really have an underfired body if I remember your saying that you were beginning to fire at c/05. Havbe youi found this bisque state is strong enough? I must make more test.

Just ordered a HW red earthenware body and a bag of Cedar Heights red Art clay to mix 25% with local clay. This mix should tighten the body. The excess silica in the local stuff will not affect the firing at that temp.


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 Post subject: Re: grog size in your clay body
PostPosted: 17 Dec 2014, 23:19 

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It ends up being the same strength as my takashi ocarina and no one has ever had any problems with his being brittle. We both are limited by the melting temperature of aluminum foil and I know he uses a stoneware body as well. Also from what I can tell, as long as the body is not in a brittle state, it really wont matter if it is fired to its normal temperature or not. If my ocarina is dropped on a hard surface, it will break, if an ocarina fired at its normal clay temperate is dropped on a hard surface, it will also break. In terms of safety of transporting mine and Mr. Kuolong's ocarinas, they don't seem to have any problems.


Please visit by Facebook page so that you can stay updated on my progress.
http://www.facebook.com/spiritwind.ocarinas

My website http://spiritwindocarina.com/


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 Post subject: Re: grog size in your clay body
PostPosted: 18 Dec 2014, 00:28 

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Hey Jordon,
don't know what tinfoil temp has to do with firing of the the clay, but you sound as tho what you are using is working for you...this is good and is all that matters!

I've used raku clay as well as stoneware with a certain degree of luck. I haven't tried large Egyptian paste whistles yet; now that would be a trip. Red clay mixed with what South Carolinians call "black dirt" makes a good color. Clay which works with my process is very short, open (duh, physical), and absorptive but tight (chemical), BUT having strength. Not quite sure about "brittleness of clay", but possibly we are speaking about the same thing. Stoneware probably doesn't shrink as much as an underfired earthenware, but with all the different clay bodies around, I don't know it that can be said with any certainty

I started knitting little carrying bags for the ocarina. The ladies at the local Senior Center helped me with the knitting loom. One story of interest is of while a table was being cleaned, an ocarina in a knitted bag was brushed aside and fell to the cement floor. The ocarina was not damaged in anyway. A fluke for sure, but a true story.

thanks for your input....my shipment of a "purchased" clay is to arrive tomorrow. Maybe nothing I've said will be meaningful after I test that clay---I am worried about the shrinkage.

Andy


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 Post subject: Re: grog size in your clay body
PostPosted: 18 Dec 2014, 18:28 

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The aluminum foil is what we use to get the carbon burns onto the clay for patterns. We wrap combustibles around the ocarina in foil and the heat the kiln to right before the melting point of the foil.

And I can't remember if you said you were planning on making ocarinas out of your new clay or something else. Whatever it is, make sure to post pics!


Please visit by Facebook page so that you can stay updated on my progress.
http://www.facebook.com/spiritwind.ocarinas

My website http://spiritwindocarina.com/


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 Post subject: Re: grog size in your clay body
PostPosted: 11 Feb 2015, 20:28 

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Traditional ocarina makers from Budrio didn't use any grog in the clay. Donati, Mezzetti and Vicinelli ocarinas were made from a very smooth clay.


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