Judith Musicant on thu 4 jun 98
I am curious about all you cone 6er's experiences since the reformulation
of Orton's cones (at least the cone 6's) a few years ago. Using the old
cones, my cone 6 glazes were mature when the cone 6 was1/2 to 3/4 down.
With the new cones, these same glazes are mature when the cone 5's are
flat and the cone 6 has barely started to go down. I learned this the hard
way when I bought a new box of cones just after the reformulation, and
didn't realize it. In my first firing with those cones, I waited until the
cone 6 was pointing down, and the glazes ran off the pots. Anyway, are all
your cone 6 glazes now more like cone 5's, as is the case with mine? I've
found that every new cone 6 glaze I've tried seems to mature with the cone
6 just barely beginning to drop--floating blue being a notable example.
Thanks for any input.
Judy Musicant
Anne Chambers on fri 5 jun 98
Judith,
You are not alone.
All of my glazes use to mature when ^6 was at three o'clock similar to yours.
Now they mature when ^5 is flat and ^6 is barely starting to bend. I no longer
use ^7 as guard cone sometimes it was starting to bend before the ^6 on several
firings. It was quite a surprise to me when I used that first box of
reformulated cones. I was more fortunate and was able to turn off the kiln when
I noticed it was taking too long for the cone to go over when the usual
temperature had been reached. It is never pleasant to lose a kiln load for any
reason.
I think some potters have glazes which have a wider firing range so the
difference between the new and old Orton cones is not as noticeable. Those
potters with glazes which mature within a shorter temperature range see the
effects more dramatically. I know within our guild some potters have seen no
difference with the new cones.
I treat all ^6 glazes now like ^5 glazes (coincidentally I have a load of tests
in the kiln right now for ^6 glazes, my annual spring glaze search which I'm
firing to ^5) I also use that 'floating blue' occasionally and it does indeed
look best at ^5.
Anne Chambers
Ottawa, Ontario
Canada
amy parker on fri 5 jun 98
Hmm. This could be part of MY problems!!! I just got a new kiln with a
controller & am taking the K.I.S.S. route with commercial glazes. I bought
cones 5-6-7 & set packs on all 3 shelves, not being the kind of person
who trusts anything with a computer in it (worked with them too long).
My controller said it hit 6, the temp matched the cone chart, BUT the cone
6 was flat & 7 was going down...and the glazes are a lot pinholed...
and runny! Overfired??? Is there a source for old and new cone charts
for comparison? The controller does have a display for the final come temp,
but perhaps it is programmed using a different scheme?
At 10:46 AM 6/4/98 EDT, you wrote:
>----------------------------Original message----------------------------
>
> I am curious about all you cone 6er's experiences since the reformulation
>of Orton's cones (at least the cone 6's) a few years ago. Using the old
>cones, my cone 6 glazes were mature when the cone 6 was1/2 to 3/4 down.
>With the new cones, these same glazes are mature when the cone 5's are
>flat and the cone 6 has barely started to go down. I learned this the hard
>way when I bought a new box of cones just after the reformulation, and
>didn't realize it. In my first firing with those cones, I waited until the
>cone 6 was pointing down, and the glazes ran off the pots. Anyway, are all
>your cone 6 glazes now more like cone 5's, as is the case with mine? I've
>found that every new cone 6 glaze I've tried seems to mature with the cone
>6 just barely beginning to drop--floating blue being a notable example.
>Thanks for any input.
>
>Judy Musicant
>
>
amy parker Lithonia, GA
amyp@sd-software.com
David Woodin Set Clayart Digest on fri 5 jun 98
The 1966 Orton cone tables at 108 deg F per hour list cone 5 @2167, 5 1/2
@2197, and 6 @2232. The old table at 108 deg F per hr listed cone 5@2151,
cone 6@2194. So perhaps you should use the new cone 5 1/2.
David
Laura Conley on fri 5 jun 98
The Oakland Community College ceramics studio in Royal Oak, Michigan went
through this. They got NO info from the company. It was very frustrating.
All their electric firing (all they do) is now done to CONE 5. The glazes are
still the same - cone 6.
Laura Conley
Boulder, CO (formerly of MI)
Judith Musicant wrote:
> ----------------------------Original message----------------------------
>
> I am curious about all you cone 6er's experiences since the reformulation
> of Orton's cones (at least the cone 6's) a few years ago. Using the old
> cones, my cone 6 glazes were mature when the cone 6 was1/2 to 3/4 down.
> With the new cones, these same glazes are mature when the cone 5's are
> flat and the cone 6 has barely started to go down. I learned this the hard
> way when I bought a new box of cones just after the reformulation, and
> didn't realize it. In my first firing with those cones, I waited until the
> cone 6 was pointing down, and the glazes ran off the pots. Anyway, are all
> your cone 6 glazes now more like cone 5's, as is the case with mine? I've
> found that every new cone 6 glaze I've tried seems to mature with the cone
> 6 just barely beginning to drop--floating blue being a notable example.
> Thanks for any input.
>
> Judy Musicant
Al Pfeiffer on sat 6 jun 98
As far as using a controller and trusting it to read the temp. accurately -
don't - repeatedly maybe. I have a Paragon controller and it typically is
about 70 F low at C6. I use a pyrometer to periodically check what the actual
temp is vs what the controller thinks it is. For a C7 firing I set the
controller to 2190 (not 2264) and the orton cones agree with my pyrometer.
Richard Arsenault on thu 23 jul 98
----------------------------Original message----------------------------
>
> I am curious about all you cone 6er's experiences since the reformulation
> of Orton's cones (at least the cone 6's) a few years ago. Using the old
> cones, my cone 6 glazes were mature when the cone 6 was1/2 to 3/4 down.
> With the new cones, these same glazes are mature when the cone 5's are
> flat and the cone 6 has barely started to go down. I learned this the hard
> way when I bought a new box of cones just after the reformulation, and
> didn't realize it. In my first firing with those cones, I waited until the
> cone 6 was pointing down, and the glazes ran off the pots. Anyway, are all
> your cone 6 glazes now more like cone 5's, as is the case with mine? I've
> found that every new cone 6 glaze I've tried seems to mature with the cone
> 6 just barely beginning to drop--floating blue being a notable example.
> Thanks for any input.
>
> Judy Musicant
>
> Hello. I was checking to see what kind of presence Orton has on the www and I ran across your story. I have a similar interest in the differences between "old" and "new" Orton cones. I am the Burning Supervisor at a large brick manufacturer (the factory is large, the bricks are normal size). When I purchase cones through our local supplier, I specify Orton "Series B" cones, which have to be drop shipped from Orton. I have been told that "Series B" cones are made using the older formulation, and the newer cones available through retail outlets are referred to as "Series A". We purchase in large quantities and I do not know if this purchase option is available to smaller volume users. Our purchase of "Series B" cones has allowed us to maintain continuity with our older methods and firing documentation, which of course is important to any user of cones.Anyway, that's the folklore around here, and a lot of the people who were here when the cones were changed feel that Orton could have done a lot more to help
users recalibrate without costly trial and error.
-----
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David Woodin Set Clayart Digest on fri 24 jul 98
The new cone 5 1/2 is the same as the old cone 6. Orton had to change there
cones for several reasons and did document this change. The Orton foundation
will answer any questions about the changes. 614-895-2663
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