Donald G. Goldsobel on mon 16 aug 99
I recently did a bisque firing in a gas downdraft 12 cu ft kiln with cones
08, 07 and 06. Only one set. The 08 started to flatten, the o6 was nose to
toes and the crazy 07 was standing soldier tall. The 06 were older than the
other cones. They were all stored together and I checked the numbers on
the cones. What causes such a situation?
Another question. About 20 years ago I received 30 boxes of cones from a
fellow who was landlord to a potter who left them behind. I used the 9, 10
and 11 for quite a while, but recently I question their accuracy based on
known glazes firing differently than usual. Has Orton changed standards?
Do the cones change with age?
Donald in the SanFernando Valley
Josh Lynch on tue 17 aug 99
Something like this happened to me once too, except it was with 5 , 6
and 7. Five went down, and then seven went down onto 6. No mistake of
mine. I called Orton and they said if a cold draft hits a cone as its
just beginning to melt it will "freeze". And that was that.
That just doesn't sound right. They make em they should know?
--- "Donald G. Goldsobel" wrote:
> ----------------------------Original
> message----------------------------
> I recently did a bisque firing in a gas downdraft 12
> cu ft kiln with cones
> 08, 07 and 06. Only one set. The 08 started to
> flatten, the o6 was nose to
> toes and the crazy 07 was standing soldier tall. The
> 06 were older than the
> other cones. They were all stored together and I
> checked the numbers on
> the cones. What causes such a situation?
>
> Another question. About 20 years ago I received 30
> boxes of cones from a
> fellow who was landlord to a potter who left them
> behind. I used the 9, 10
> and 11 for quite a while, but recently I question
> their accuracy based on
> known glazes firing differently than usual. Has
> Orton changed standards?
> Do the cones change with age?
>
> Donald in the SanFernando Valley
>
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=?iso-8859-1?Q?Fran=E7oise?= Melville on tue 17 aug 99
------------------
I fire to cone 6 in a natural gas updraft and use conepacks with cones 5
and 6. Recently I ran out of sixes and decided to use some 10 year old
sevens (well-stored )which bent (according to my pyrometer) at the same
temperature as the sixes.
When I received more modern cone 6s, and experimented using both the 6s
and 7s in my conepacks, I was not surprised to see that they bent
simultaneously. Is this because of age or has Orton changed their cones'
melting temperature?
Fran=E7oise
Indalo Pottery
http://members.tripod.com/=7Eindalopottery
Mike Bailey on tue 17 aug 99
In message , Donald G. Goldsobel writes
Dear Donald,
Yes, one certainly see variations like this in which a supposedly lower
cone is behind in its bending in relation to the rest of the set.
There's obviously variation - both between manufacturers and batches
from the same manufacturer.
The advice is to test your new box of cones against the existing present
ones in use - just to see if they bend the same. Of course, very few of
us do!
They shouldn't change with age.
Cheers,
Mike Bailey.
>----------------------------Original message----------------------------
>I recently did a bisque firing in a gas downdraft 12 cu ft kiln with cones
>08, 07 and 06. Only one set. The 08 started to flatten, the o6 was nose to
>toes and the crazy 07 was standing soldier tall. The 06 were older than the
>other cones. They were all stored together and I checked the numbers on
>the cones. What causes such a situation?
>
>Another question. About 20 years ago I received 30 boxes of cones from a
>fellow who was landlord to a potter who left them behind. I used the 9, 10
>and 11 for quite a while, but recently I question their accuracy based on
>known glazes firing differently than usual. Has Orton changed standards?
>Do the cones change with age?
>
>Donald in the SanFernando Valley
>
--
Mike Bailey
Murray & Bacia Edelman on wed 18 aug 99
Hi, Francoise. Sometime in the past, I reported a conversation I had with
Dale Fronk or some such expert at Orton ( name and 800 no. are downstairs.)
He told me to heave the white cone 7's. Old. They now come in color.
The old ones are definitely not reliable. But the 5's and 6's are.
Have company from abroad as well as from Cal. and a bit rushed. Let me
know if you need the 800 no. And do buy new cone 7's.
Best, Bacia Edelman
At 12:22 PM 8/17/99 EDT, you wrote:
>----------------------------Original message----------------------------
>------------------
>I fire to cone 6 in a natural gas updraft and use conepacks with cones 5
>and 6. Recently I ran out of sixes and decided to use some 10 year old
>sevens (well-stored )which bent (according to my pyrometer) at the same
>temperature as the sixes.
>When I received more modern cone 6s, and experimented using both the 6s
>and 7s in my conepacks, I was not surprised to see that they bent
>simultaneously. Is this because of age or has Orton changed their cones'
>melting temperature?
>
>Fran=E7oise
>Indalo Pottery
>http://members.tripod.com/=7Eindalopottery
>
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