[Clayart] bisque firing (story)my kiln

Kathy Schultz K1claylady at aol.com
Sun Jul 28 09:56:26 EDT 2019

Jenken tells me that if it is a short it would blow the breaker instantly after starting the kiln, which did not happen. At least it didn’t blow the breaker out totally like what happened to Snail! I think what I will do while waiting for my electrician to
Return from vacation is take a couple of the smaller 08 bisque pieces and glaze 
Them for a firing in my small kiln along with pieces from a previous 05 firing and see what happens. I’m more afraid of pin holes in the glaze as some of the pieces
Are mini fountains which must hold water and are fired to cone 6.
Thank you all for your input!
Kathy Schultz🌴

Sent from my iPad

> On Jul 26, 2019, at 4:39 PM, Paul Gerhold <gerholdclay at gmail.com> wrote:
> Not an electrician but it is very hard to think of how an element could cause excess amperage. Usually this kind of problem is a short in the kiln wiring. Putting in new elements jiggles a lot of wires and connections. If it is a short causing the problem you should be able to smell it just by sniffing around the electrical boxes on the kiln when the breaker pops. 
> Personally I doubt you will have a problem. That said the bisque will be more absorbent so depending on how you glaze you may have to adjust dipping time. And depending on your clay you may be more prone to pinholes   
> Paul
>> On Jul 26, 2019, at 3:24 PM, Kathy Schultz <K1claylady at aol.com> wrote:
>> I have a question related to a bisque firing. I had put new elements in my Jenken kiln. I was firing a bisque to Cone 05 manually.The 45 amp kiln blew my 80 amp circuit breaker at 950 C. Which is about 08. The day before I was trying to fire the bisque using my Sentry Controller which blew my 50 amp Circuit breaker at 444C.
>> I thought maybe the 50 amp circuit breaker might be old and that is why it blew. The 80 amp is much newer so I tried to do the firing manually.
>> My kiln electrician will test the elements with his amp meter when he comes back from vacation as it seems to be a problem with the kiln.
>> What I would like to know is what you all think about going ahead with glazing and firing these pots to cone 5 since they did not reach cone 05? I have another smaller kiln I can use for this. 
>> Thanks,
>> Kathy Schultz 🌴
>> Sent from my iPad
>>> On Jul 22, 2019, at 1:17 PM, mel jacobson <melpots at visi.com> wrote:
>>> the process of bisque firing is not simple, or easy.
>>> it is complex....and ron and others have given us
>>> a good education on how to do it the right way.
>>> there are many considerations for the potter to make
>>> as to bisque firing your own special work. 
>>> when you consider the many clay bodies, glazes, types
>>> of kilns plus years of total bs that has been stuck in the
>>> brains of many clay making folks, it goes without saying
>>> that people can get very confused.
>>> so much when you glaze pots is the condition of the
>>> bisque fired pieces.  for example, i layer glazes and tend
>>> to put a lot of glaze on my pots.  i need for the bisque ware
>>> to be a bit more open, or sponge like.  when ron is doing very
>>> dense porcelain work...he does not want the spongy bisque.
>>> so,it is simple to see two very different attitudes as to what
>>> cone to bisque fire your pots.  when doing cone 12 gas fired
>>> medium reduction i fire my bisque to cone 08.  ron may fire
>>> to cone 04 or higher.  the entire theory is what kind of glaze
>>> are you firing, what is your final cone, and what do you want
>>> the bisque pot to do for you?.
>>> there is no one size fits all. 
>>> i always try to get all the non'clay material to burn out of
>>> my bisque.  i have been experimenting with my new mel6 to
>>> be fired a bit faster...i do however try to hold the firing at
>>> about 1500F for an hour or so.  it seems to work just fine,
>>> but i have no scientific proof....it works, and i don't have
>>> pinholes.  that is good enough for me.
>>> for folks that are a bit newer to clay than me, i suggest you
>>> follow ron's instructions to the T.   as you gain experience
>>> and really know what you want your pots to do, then you
>>> can adjust to your own work...
>>> as i age, i more and more come to the conclusion that
>>> there are thousands of ways to do things with clay.
>>> what works for one, does not work for others.
>>> being dogmatic just gets us in trouble.  but as they
>>> say...`we can a not change the laws of physics scotty`
>>> but, i keep on trying...that is just me.
>>> mel
>>> -- 
>>> Mel's Website:  www.melpots.com
>>> http://www.melpots.com/CLAYART.HTML
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