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 Post subject: Chaang Ocarina
PostPosted: 27 Mar 2014, 18:42 

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Hi, my name is Makoto Kageyama. I'm the maker of Chaang Ocarina. Our workshop
is located in Bangkok, Thailand. I've worked as a potter for many years, and out of
my love for clay and music, I started making ocarinas in 2008. You can see our ocarinas
on: http://chaangocarina.weebly.com/

Our 12 hole ocarinas are made from local red clay, burnished and smoke-fired at cone 06.
At present, Alto C and Soprano F,G,C are available. We would like to expand our
product range in the future and update them on our facebook page: https://www.facebook.com/ChaangOcarina?ref=hl
We welcome any inquiries, suggestions and feedbacks on our ocarinas. Aloha!


You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 29 Mar 2014, 06:17 

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Nice to see you here. I'll be following you on facebook!


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: Chaang Ocarina
PostPosted: 29 Mar 2014, 13:01 

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very nice work! theres an impressive amount of ocarinas in those photos :D


please visit my website and see what Im making! http://facebook.com/oberonocarinas


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 Post subject: Re: Chaang Ocarina
PostPosted: 31 Mar 2014, 04:03 

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Thanks, Spirit. I really like the color of your glazed ocarinas! It's something that I'm trying to develop right now, glazed ocarinas.


You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 31 Mar 2014, 04:15 

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Thanks Ross for your comment. I like how you give names to your ocarinas and the smoke firing variations too! I feel the sense of originality in each piece.


You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 31 Mar 2014, 16:09 

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Thank you for the compliment. I actually think I am gonna move away from glazes for ocarinas at least for the time being. I will probably come back to them, but instead of using high fire stoneware glazes, I will opt for lower fire glazes. From what Iv'e found, there seems to be many more options for high fire stoneware glazes then the lower fire glazes. While there are many beautiful glazes in both high fire and low fire, the high fire glazes seem to be a bit more bountiful and more appealing most of the time. The problem that Iv'e had with using them for ocarinas is that they need to be fired really high (cone 5/ cone 6) in order to properly melt. This creates a high shrink rate because of how the firing process works and the high shrink rate causes the voicing of the ocarina to shrink which causes squeaking. :/ Firing at lower temperatures really makes making ocarinas much easier because they don't shrink that much which causes less problems. So I'm gonna leave the high fire and beautiful glaze jobs to the glazing master on this forum. You should really check out some of Jade's work. It's stunning.


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: Chaang Ocarina
PostPosted: 02 Apr 2014, 15:15 

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Deart Spirit, yep, glazing an ocarina is a challenging work when you think about the shrinkage of the body and how it affect the sound of ocarina and having to make fine adjustments here and there.
My gosh, hradaches! It seems like its a trade off between visual and sound factors.The customers I work with seem to like the glossy finish of glazed ocarina. So I will try to develop glazed versions to just as to offer more choice for my clients. I hope they will sound as good as my terra-cotta ocarinas!

Chaang Ocarina http://chaangocarina.weebly.com/


You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 02 Apr 2014, 16:14 

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Good luck with it! If you find that your having difficulties with glazing on the high end temperatures, you may want to look into some lower fire glazes. There are not as many but some are still quite beautiful. It may be easier for other people whose clay has less of a shrink rate but higher fire clays tend to shrink a lot so if you can get the stoneware glazes working for you, more power to you :D


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: Chaang Ocarina
PostPosted: 07 May 2014, 14:04 

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Here is an update on my glazed ocarinas. The glaze firing went well and color seems OK.
I got the shrinkage and the pitch relativity alright. But I'm having a second thought about
glazing my ocarinas for the following reasons. 1) The clear glaze makes ocarina slippery and easy
to drop. 2) The hardened body makes the player's saliva to settle inside ocarina and eventually clog
the wind way. 3) The clear glaze seems to create squeaky sound due to its micro-size crazing.
To get the most benefit out of glazing, I will just use matt glazes because matt glaze is less slippery
and less squeaky sound. I'll keep using Cone 6 glazes since I'm familiar working with them.
I will have another update after my next glaze firing. Aloha!

http://chaangocarina.weebly.com


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You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 08 May 2014, 15:35 

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I can't really offer a solution to the first problem of the glaze making the surface slippery, but I do have experience with the second problem. Many glazes are not only cone 6. They may have a range between 5-6 or something like that. This may not be true for your glazes however. Anyways, if you want to fix your condensation problem within the windway, then you will have to lower the temperature that you fire at to at least cone 5. (I found there was a big difference between cone 5 and cone 6) At some point, the clay loses it porous state and later vitrifies. This causes condensation issues as the clay cannot adsorb the moisture of breath. The clay is just too refractory at this point. Anyways, if you can, i would say to lower your fire temp to the lower end of your glaze requirements.

As to the squeaking, I have never had any problems with squeaking due to crazing of a glaze. I did have a lot of trouble with how the voicing and windway shrunk which caused squeaking problems. Of course smoke firing or lower glaze firing fixes this issue because the clay won't shrink near as much at lower temperatures rather then around cone 5 and 6. I think that after experimenting, I found that the majority of the shrinking or at least the extra shrinking occurred right at cone 3. Almost like that was a stage the clay went through, and because of it shrunk drastically. I think anything below cone 3 was much less problematic in regards to shrinking and squeaking.


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: Chaang Ocarina
PostPosted: 09 May 2014, 19:28 

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Spirit Wind, thanks for sharing your thoghts and experience. Yes, I'm fully aware of stoneware body's sintering action after cone 08 and losing porosity as the clay nears its maturation. As a potter, I've been firing my works with a caution in mind that the body and glaze must be fired to their maturation. Otherwise, the result will be uneven glaze finish or water leakage in worst cases :P The water absorption rate can be adjusted by changing the chemical composition of the clay(by increasing Al2O3 component in the body mix.) But it can only increase the water absorption rate up to 5 to 10% in my experience. So, lowering the firing temp. and leaving the body porous and under-fired is the easiest way, as you suggest. My matt glaze can work at much lower range than cone 6. I may try to lower my firing temp. if I want to solve the moisture problem for glazed ocarinas. But I'm not sure at this point if it's worth a time and effort to find glazes in new temp. range. In Thailand, ready-made glazes are limited and I'm also hesitant to use Frits as a base glaze because of its poor workability. I did a lot of production with frit based glazes before, but disliked how they settle so quickly at the bottom. Anyway, glazed ocarina is still new and an option for me since I've been making non-glazed terra cotta ocarinas. I will do some more glaze firing and update the result here. Thanks for your time. Aloha!


You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 10 May 2014, 01:02 

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Good luck man, I have respect for those who make ocarinas with stoneware glazes, I find it quite difficult :D


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: Chaang Ocarina
PostPosted: 02 May 2015, 15:34 

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Here's the latest update on our ocarina making: I got hold of some stable transparent frits (cone 04) here in Thailand and I've been making glazed ocarinas in three different colors. The finish is consistent and the glaze is easy to work with (no settling at the bottom of bucket). As far as the glazed version, I think I will go with this style for awhile. As Spirit wind suggests, working with stoneware glaze and firing at high temperature is so much difficult considering the contraction and hardening of the clay body. The final tuning process will be a long battle between diamond drill head and the stoneware body. I've been making transverse AC, SG, SF, SC and 6-holes AC in this style and my clients seem to enjoy the finish. I've started adding a strap hole for all ocarinas because transparent glaze makes the surface really slippery. The squeaking doe not really occur at this point because at cone 04, the body has not yet reached the vitrification stage. The contraction of body is not any bigger than ordinary bisque firing. However, I do notice a little difference in the tone of sounds between glazed ocarinas and terra cotta ocarinas. The glazed ocarinas sound a bit "glassy" or "metallic" while terra cotta ocarinas sound "earthy". I think this is due to the glaze coating on the surface affecting how the ocarina resonate. Anyway, as far as the glazed ocarina goes, I will try to develop more glaze and shape variations at cone 04. I will also continue my terra cotta ocarinas and try to upgrade them. Will update again. Aloha.


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You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 03 May 2015, 14:36 

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The water absorption rate can be adjusted by changing the chemical composition of the clay(by increasing Al2O3 component in the body mix.) But it can only increase the water absorption rate up to 5 to 10% in my experience. So, lowering the firing temp. and leaving the body porous and under-fired is the easiest way, as you suggest. My matt glaze can work at much lower range than cone 6. I may try to lower my firing temp. if I want to solve the moisture problem for glazed ocarinas. But I'm not sure at this point if it's worth a time and effort to find glazes in new temp. range. In Thailand, ready-made glazes are limited and I'm also hesitant to use Frits as a base glaze because of its poor workability. I did a lot of production with frit based glazes before, but disliked how they settle so quickly at the bottom. Anyway, glazed ocarina is still new and an option for me since I've been making non-glazed terra cotta ocarinas. I will do some more glaze firing and update the result here. Thanks for your time. Aloha![/quote]


Chaang, this discussion is interesting. I noticed your saying that you increased the Al203 in the body. Have you tried increasing the silica content--that is if you do fire over cone 4.

I certainly can say that my aesthetics has changed since school (Stoneware clay and glaze bodies only)-- and low fire is cheaper and satisfactory for ocarina making. Yes I've made cone 6 examples and dislike everything about them, the tactile quality, the lack of absorption of moisture in the wind channel, etc. And I have not used glazes for 15 years---health problems with mixing the raw chemicals, problems you mentioned with frit and other glazes settling. The present concern was one you mentioned whether earthenware or immature stoneware is used--it is the final tuning of any fired state of clay; the dust is simply dangerous. I would be interested in knowing how you try to avoid this problem. Giorgio Cataldi has developed working procedures, including working only on humid days, that are interesting.

I use local shale clays; it's fun to dig in your own yard and making things from it. It is certainly short. Shrinkage is low at c/05 with only a 2% increase at c/5!!!. I really underfire this stuff, but I do like the sound....Hope to continue this discussion when time allows.

andy


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 Post subject: Re: Chaang Ocarina
PostPosted: 04 May 2015, 21:54 

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I would strongly reccomend using a 'designed for earthenware' clay over stoneware at lower tempriture. In my experiance earthenwaee glazes craze very badly when used on stoneware clays. Howeaver for ergonomocs i still prefer unglazed erthenware as it absorbs any moisture from your hands, which in combination with the rougher surface makes sliding to subholes easier.


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 Post subject: Re: Chaang Ocarina
PostPosted: 04 May 2015, 22:47 

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Glaze fit is certainly a problem when one does not take into account what you mentioned as well as eutectics. I've seen so many folk using "store-bought" earthenware glazes to apply on under fired stoneware. Results are quite often, "Time always tells". Using that combination the "other way around" can often end in shivering; neither is what I ever wanted, so now life is more pleasant using bamboo for ocarinas and shellac to paint on the earthenware ocarinas I make. Low=fire surfaces can be very handsome, but my time is too short for starting all of that again. I bet if I still had access to a lab, I'd try Egyptian Paste, or other self-glazing earthware bodies.....hummmm haven't done that in years and there is a simple way to accomplish this.....Thanks Robert...you awakened the old mind. Andy


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 Post subject: Re: Chaang Ocarina
PostPosted: 31 May 2015, 01:48 

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Hi Andy, it's good to hear from you. I actually did not perform any experiment on the body mixture yet knowing it would take too long to finish. I was just assuming the options on what I could do to increase the water absorption rate of high temp. body. And I just remembered my past testing of tri-axial body mixing of feldspar, Kaolin and silica. From this testing, increased kaolin did show an increase in water absorption. So I just I assumed that would be the right direction if I want to adjust the water absorption rate in white stoneware body. I also remembered that mixing calcinated Kaolin in the body would also help to reduce the shrinkage, thus, increasing water absorption rate. As you say, it only makes sense to add SiO2, when Al2O3 is increased in the body, in order to achieve well-balanced ceramic body. It would also reduce the risk of shivering or crawling.
For the dust problem, I'm not a really good example of a safe craftsman. Luckily, I haven't developed any lung disease yet. My pottery teacher was a diehard craftsman who did not give a hell. He used to buff and sand bone dry sculptures with all kinds of oxides in the clay. His dust protection was quite minimum. I do wear dust protection mask while tuning each hole and I use a small vacuum cleaner to suck all the dust in the chamber before I blow into ocarinas. I'm also thinking about installing a ventilation fan on the window as they do at porcelain production studio. Working only on humid days...it's an interesting idea since Bangkok, where I live, is humid all through the year.


You can see our ocarinas at: http://chaangocarina.weebly.com


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 Post subject: Re: Chaang Ocarina
PostPosted: 31 May 2015, 02:13 

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Oh, Now I believe I understand your question; ie, "...to increase water absorption". You are referring to making in immature stoneware body by adding more clay. As you have said adding clay adds more than just al203, but many other elements. When you were speaking of stoneware, I was assuming you were firing higher than c/06. Please tell me the temp you are trying for your "white" stoneware. All these adjustments were fun at one time, not now!!!! I work with local shale, a very grainy, coarse, short claylike mix found in my wife's flower beds. I've had fun and because one can't mature fire (fuse) this particles, even at c/6, the ocarina have plenty of water absorption.

As for the dust. Well I'm old now and I do have lung problems which has been traced to the ceramic lab. So as of late I m working with bamboo for ocarinas....and by the way, one of our best friends was Pat Parthenrok (sp) from Bangkok. I still have one of her drawings. What a wonderful young lady.


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 Post subject: Re: Chaang Ocarina
PostPosted: 20 Jul 2015, 20:08 

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Hi Robert, thanks for your suggestion. In fact, my earlier ocarina production was mainly using terra cotta clay, which I would usually varnish and smoke fire in sagger. During my research years, I made some terra cotta ocarinas wherever I traveled using locally available red clay, the countries like Sri Lanka and Nepal. Those we're burnished and smoke fired ocarinas. There are certain type of clay that are suitable for burnishing and smoke firing. The earthenware clay of Kathmandu was very sweet for burnishing and smoke firing. Since I setup a pottery studio last year in Bangkok, I've had many requests from my clients for glazed ocarinas. So I started producing glazed ocarinas to meet my clients' demand and offer alternatives. I've obtained some samples of low-temp. frit from Ferro Thailand and the frit I use as a base glaze is much less crazing. (I wish I could tell you the product code, but they have different code system here). Stoneware clay is certainly under fired at cone 04, but I never had any breakage or chips resulting from ordinary handling of my ocarinas or even quite rough handling. Anyway, the production of glazed ocarinas is now consistent in my studio, although there's still room to improve. I'm getting back to earthenware ocarina production soon. Cheers!


You can see our ocarinas at: http://chaangocarina.weebly.com


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