Fred Parker on fri 9 oct 09
Hello:
Genius here.
In my haste to get a bisque load of stoneware and porcelain going I
inadvertently programmed the controller on my electric kiln to fire to co=
=3D
ne
04 then HOLD for 2.5 hours. I intended to PREHEAT for 2.5 hours, then fi=
=3D
re
to cone 04. Can anyone offer an educated guess what cone I actually
reached? What, if any adjustments should I make in glazing?
Many thanks,
Fred Parker
James Freeman on fri 9 oct 09
Fred...
I'd estimate that your 2 1/2 hour soak raised your firing only a cone or so
higher, two at the most, and that with stoneware and porcelain clay it will
make no difference at all in regard to glazing or anything else. If you di=
p
your pots, maybe hold a second longer than usual. If you spray, no
difference. Why not just dip a piece, then see if the glaze coat is to you=
r
liking?
I'll bet you the folks at Orton could tell you for certain, if you really
cared, but you are in any case likely "close enough for hand grenades".
...James
James Freeman
"All I say is by way of discourse, and nothing by way of advice. I should
not speak so boldly if it were my due to be believed."
-Michel de Montaigne
http://www.jamesfreemanstudio.com
http://www.flickr.com/photos/jamesfreemanstudio/
http://www.jamesfreemanstudio.com/clayart/
On Fri, Oct 9, 2009 at 11:32 AM, Fred Parker wrote:
> Hello:
>
> Genius here.
>
> In my haste to get a bisque load of stoneware and porcelain going I
> inadvertently programmed the controller on my electric kiln to fire to co=
ne
> 04 then HOLD for 2.5 hours. I intended to PREHEAT for 2.5 hours, then fi=
re
> to cone 04. Can anyone offer an educated guess what cone I actually
> reached? What, if any adjustments should I make in glazing?
>
> Many thanks,
>
> Fred Parker
>
Dinah Snipes Steveni on fri 9 oct 09
Simple ideas here. Check porosity by putting tongue on bisqued piece. If yo=
=3D
u feel a bit of a draw you should be able to glaze okay. But if you've gone=
=3D
a bit high --if you spray you might have to heat surface with a paint-stri=
=3D
pper gun, for instance, =3DC2=3DA0while=3DC2=3DA0on turning wheel=3DC2=3DA0=
and spraying=3D
evenly. Dipping/pouring: have your glaze pretty creamy in consistency. Wai=
=3D
t overnight and=3DC2=3DA0decant water from glaze bucket. =3DC2=3DA0Have hea=
t gun re=3D
ady to help dry if you want another coat. As I said these are simple ideas =
=3D
I=3DC2=3DA0use if I want to refire/reglaze a piece which has been fired glo=
ss f=3D
ired ^6++. Others will have more to say on what the 2 1/2 hours of heat wor=
=3D
k did, but with a porosity test etc you should be fine.=3D20
=3DC2=3DA0=3D20
Dinah=3D20
http://www.dinahsnipessteveni.com=3D20
http://www.dianthusceramics.blogspot.com=3D20
http://www.skagitartiststogether.com=3D20
John Britt on fri 9 oct 09
Orton has a cone estimating program. You put in the temp reached, rise pe=
=3D
r=3D20
hour and you get an estimate of the cone reached,
John Britt
www.johnbrittpottery.com
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