mel jacobson on thu 22 oct 09
i hope these notes transfer to clayart ok.
mel
Recipe
Bentonite 16
Bone Ash 62
Frit 3195 60
Lithium Carbonate 25
Red Iron Oxide 41
Silica 82
Talc 18
Unispar 196
Empirical Formula
K2O 0.0595 Al2O3 0.2866 SiO2 2.5773
Na2O 0.1673 B2O3 0.1173 P2O5 0.1096
Li2O 0.2004 Fe2O3 0.1547
CaO 0.4888
MgO 0.0841
Firing Profiles - including downfire
These are the firing profiles as programmed for a kiln controller
The kiln controller does not know about rising and falling
temperature. If the target temperature for a ramp is above its
previous temperature, it heats the kiln, otherwise it allows it to
cool at the specified rate. 9999 is a shorthand way of saying, drop
however fast you can. In fact it doesn't work all that well, and
subsequent firings give a target temperature drop rate of 300 deg F
when free fall is desired.
Firing # 1
1 150 deg F hr to 200 deg F
hold 3 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -9999 deg F hr to 1850 deg F
5 -400 deg F hr to 1600 deg F
hold 1 hr
6 400 deg F hr to 2050 deg F
7 -81 deg F hr to 1900 deg F
Firing # 2
1 150 deg F hr to 200 deg F
hold 1 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -300 deg F hr to 1850 deg F
hold 20 min
5 -300 deg F hr to 1800 deg F
6 -42 deg F hr to 1550 deg F
7 400 deg F hr to 1950 deg F
8 -50 deg F hr to 1750 deg F
Firing # 3
1 150 deg F hr to 200 deg F
hold 1 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -300 deg F hr to 1850 deg F
hold 20 min
5 -300 deg F hr to 1800 deg F
6 -42 deg F hr to 1550 deg F
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
new book: http://www.21stcenturykilns.com
Arnold Howard on thu 22 oct 09
From: "mel jacobson"
If the target temperature for a ramp is above its
> previous temperature, it heats the kiln, otherwise it
> allows it to
> cool at the specified rate. 9999 is a shorthand way of
> saying, drop
> however fast you can.
Several points I'm often asked about regarding controlled
cooling:
Heating the kiln at a rate of 9999 leaves the elements
turned on, just like turning a switch to High. Cooling at a
rate of 9999 turns the elements off. You will not hear the
relays clicking during a 9999 rate.
Learn your kiln's natural cooling rate. Programming a
cooling rate that is faster than that will result in an
error message.
Program a cooling segment the same way you program a heating
segment. Only instead of entering a higher temperature,
enter a lower one.
Sincerely,
Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
ahoward@paragonweb.com / www.paragonweb.com
Loren JOnes on thu 22 oct 09
16% bentonite? That seems a little high. One would need a putty knife to ap=
ply it.
________________________________
From: mel jacobson
To: Clayart@LSV.CERAMICS.ORG
Sent: Thu, October 22, 2009 5:01:12 AM
Subject: notes on downfiring from carol
i hope these notes transfer to clayart ok.
mel
Recipe
Bentonite 16
Bone Ash 62
Frit 3195 60
Lithium Carbonate 25
Red Iron Oxide 41
Silica 82
Talc 18
Unispar 196
Empirical Formula
K2O 0.0595 Al2O3 0.2866 SiO2 2.5773
Na2O 0.1673 B2O3 0.1173 P2O5 0.1096
Li2O 0.2004 Fe2O3 0.1547
CaO 0.4888
MgO 0.0841
Firing Profiles - including downfire
These are the firing profiles as programmed for a kiln controller
The kiln controller does not know about rising and falling
temperature. If the target temperature for a ramp is above its
previous temperature, it heats the kiln, otherwise it allows it to
cool at the specified rate. 9999 is a shorthand way of saying, drop
however fast you can. In fact it doesn't work all that well, and
subsequent firings give a target temperature drop rate of 300 deg F
when free fall is desired.
Firing # 1
1 150 deg F hr to 200 deg F
hold 3 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -9999 deg F hr to 1850 deg F
5 -400 deg F hr to 1600 deg F
hold 1 hr
6 400 deg F hr to 2050 deg F
7 -81 deg F hr to 1900 deg F
Firing # 2
1 150 deg F hr to 200 deg F
hold 1 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -300 deg F hr to 1850 deg F
hold 20 min
5 -300 deg F hr to 1800 deg F
6 -42 deg F hr to 1550 deg F
7 400 deg F hr to 1950 deg F
8 -50 deg F hr to 1750 deg F
Firing # 3
1 150 deg F hr to 200 deg F
hold 1 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -300 deg F hr to 1850 deg F
hold 20 min
5 -300 deg F hr to 1800 deg F
6 -42 deg F hr to 1550 deg F
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
new book: http://www.21stcenturykilns.com
James Freeman on thu 22 oct 09
On Thu, Oct 22, 2009 at 9:37 AM, Arnold Howard wrot=
e:
>
>
> Learn your kiln's natural cooling rate. Programming a
> cooling rate that is faster than that will result in an
> error message.
>
Arnold...
Is this true with all brands of controllers? I've been programming 9999 fo=
r
"as fast as you can" for both heating and cooling rates on three different
kilns with Bartlett controllers, and have never gotten an error message.
Never tried it with an Orton controller nor with the new cheap Chinese
ones. Have I just been lucky?
Take care.
...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/
Karin Givon on thu 22 oct 09
Hey Mel-fascinating to see the variations in a glaze--but in my
computer one of those three was black-as in the photo didn't show up
altho you could ( barely) see something was there. The other two were
enough to convince just about anybody, tho. I'm wondering WHICH was
#2 and which was #3, and guessing the slower cool was the one with
the most evident "spottiness" or texture? Carol's site was also fun,
but I would have loved to see more of her work.
Thanks for this effort.
Karin
Nevada City, cA
On Oct 22, 2009, at 4:01 AM, mel jacobson wrote:
i hope these notes transfer to clayart ok.
mel
Recipe
Bentonite 16
Bone Ash 62
Frit 3195 60
Lithium Carbonate 25
Red Iron Oxide 41
Silica 82
Talc 18
Unispar 196
Empirical Formula
K2O 0.0595 Al2O3 0.2866 SiO2 2.5773
Na2O 0.1673 B2O3 0.1173 P2O5 0.1096
Li2O 0.2004 Fe2O3 0.1547
CaO 0.4888
MgO 0.0841
Firing Profiles - including downfire
These are the firing profiles as programmed for a kiln controller
The kiln controller does not know about rising and falling
temperature. If the target temperature for a ramp is above its
previous temperature, it heats the kiln, otherwise it allows it to
cool at the specified rate. 9999 is a shorthand way of saying, drop
however fast you can. In fact it doesn't work all that well, and
subsequent firings give a target temperature drop rate of 300 deg F
when free fall is desired.
Firing # 1
1 150 deg F hr to 200 deg F
hold 3 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -9999 deg F hr to 1850 deg F
5 -400 deg F hr to 1600 deg F
hold 1 hr
6 400 deg F hr to 2050 deg F
7 -81 deg F hr to 1900 deg F
Firing # 2
1 150 deg F hr to 200 deg F
hold 1 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -300 deg F hr to 1850 deg F
hold 20 min
5 -300 deg F hr to 1800 deg F
6 -42 deg F hr to 1550 deg F
7 400 deg F hr to 1950 deg F
8 -50 deg F hr to 1750 deg F
Firing # 3
1 150 deg F hr to 200 deg F
hold 1 hr
2 400 deg F hr to 1949 deg F
3 120 deg F hr to 2170 deg F
hold 20 min
4 -300 deg F hr to 1850 deg F
hold 20 min
5 -300 deg F hr to 1800 deg F
6 -42 deg F hr to 1550 deg F
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
new book: http://www.21stcenturykilns.com
Snail Scott on thu 22 oct 09
On Oct 22, 2009, at 10:42 AM, James Freeman wrote:
> Is this true with all brands of controllers? I've been programming
> 9999 for
> "as fast as you can" for both heating and cooling rates on three
> different
> kilns with Bartlett controllers, and have never gotten an error
> message...
That's what Arnold meant - that 9999 will act as a
direct 'on' or 'off' command, whereas programming
(for instance) a 800F per hour cooling won't work if
the natural cooling rate is only 400F/hr. That's what
will bring forth the error message.
-Snail
Steve Slatin on thu 22 oct 09
Loren -- look at the recipe -- it's not in=3D20
percent. It's for a 500 g batch; it's just
about 3% bentonite.=3D20
Steve Slatin --=3D20
--- On Thu, 10/22/09, Loren JOnes wrote:
> 16% bentonite? That seems a little
> high. One would need a putty knife to apply it.
>=3D20
>=3D20
>=3D20
>=3D20
>=3D20
> Recipe
> Bentonite=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 16
> Bone Ash=3DA0 =3DA0 =3DA0 =3DA0 =3DA0
> =3DA0=3DA0=3DA062
> Frit 3195=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 60
> Lithium Carbonate=3DA0 =3DA0 25
> Red Iron Oxide=3DA0 =3DA0 =3DA0=3DA0=3DA041
> Silica=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0
> =3DA0=3DA0=3DA082
> Talc=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0
> =3DA0=3DA0=3DA018
> Unispar=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0
> 196
>=3D20
> Empirical Formula
> K2O=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 0.0595=3DA0 =3DA0
> =3DA0=3DA0=3DA0Al2O3=3DA0 =3DA0 =3DA0 =3DA0
> 0.2866=3DA0 =3DA0 =3DA0=3DA0=3DA0SiO2=3DA0 =3DA0
> =3DA0 =3DA0=3DA0=3DA02.5773
> Na2O=3DA0 =3DA0 =3DA0 =3DA0=3DA0=3DA00.1673=3DA0
> =3DA0 =3DA0=3DA0=3DA0B2O3=3DA0 =3DA0 =3DA0
> =3DA0=3DA0=3DA00.1173=3DA0 =3DA0
> =3DA0=3DA0=3DA0P2O5=3DA0 =3DA0 =3DA0
> =3DA0=3DA0=3DA00.1096
> Li2O=3DA0 =3DA0 =3DA0 =3DA0=3DA0=3DA00.2004=3DA0
> =3DA0 =3DA0=3DA0=3DA0Fe2O3=3DA0 =3DA0 =3DA0 =3DA0
> 0.1547
> CaO=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 0.4888
> MgO=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 0.0841
>=3D20
>=3D20
> Firing Profiles - including downfire
>=3D20
>=3D20
>=3D20
>=3D20
> These are the firing profiles as programmed for a kiln
> controller
>=3D20
> The kiln controller does not know about rising and falling
> temperature. If the target temperature for a ramp is above
> its
> previous temperature, it heats the kiln, otherwise it
> allows it to
> cool at the specified rate. 9999 is a shorthand way of
> saying, drop
> however fast you can. In fact it doesn't work all that
> well, and
> subsequent firings give a target temperature drop rate of
> 300 deg F
> when free fall is desired.
>=3D20
> Firing # 1
> 1=3DA0=3DA0=3DA0150 deg F hr to 200 deg F
> =3DA0 =3DA0 hold 3 hr
> 2=3DA0=3DA0=3DA0400 deg F hr to 1949 deg F
> 3=3DA0=3DA0=3DA0120 deg F hr to 2170 deg F
> =3DA0 =3DA0 hold 20 min
> 4=3DA0=3DA0=3DA0-9999 deg F hr to 1850 deg F
> 5=3DA0=3DA0=3DA0-400 deg F hr to 1600 deg F
> =3DA0 =3DA0 hold 1 hr
> 6=3DA0=3DA0=3DA0400 deg F hr to 2050 deg F
> 7=3DA0=3DA0=3DA0-81 deg F hr to 1900 deg F
>=3D20
> Firing # 2
> 1=3DA0=3DA0=3DA0150 deg F hr to 200 deg F
> =3DA0 =3DA0 hold 1 hr
> 2=3DA0=3DA0=3DA0400 deg F hr to 1949 deg F
> 3=3DA0=3DA0=3DA0120 deg F hr to 2170 deg F
> =3DA0 =3DA0 hold 20 min
> 4=3DA0=3DA0=3DA0-300 deg F hr to 1850 deg F
> =3DA0 =3DA0 hold 20 min
> 5=3DA0=3DA0=3DA0-300 deg F hr to 1800 deg F
> 6=3DA0=3DA0=3DA0-42 deg F hr to 1550 deg F
> 7=3DA0=3DA0=3DA0400 deg F hr to 1950 deg F
> 8=3DA0=3DA0=3DA0-50 deg F hr to 1750 deg F
>=3D20
> Firing # 3
> 1=3DA0=3DA0=3DA0150 deg F hr to 200 deg F
> =3DA0 =3DA0 hold 1 hr
> 2=3DA0=3DA0=3DA0400 deg F hr to 1949 deg F
> 3=3DA0=3DA0=3DA0120 deg F hr to 2170 deg F
> =3DA0 =3DA0 hold 20 min
> 4=3DA0=3DA0=3DA0-300 deg F hr to 1850 deg F
> =3DA0 =3DA0 hold 20 min
> 5=3DA0=3DA0=3DA0-300 deg F hr to 1800 deg F
> 6=3DA0=3DA0=3DA0-42 deg F hr to 1550 deg F
>=3D20
> from: minnetonka, mn
> website: http://www.visi.com/~melpots/
> clayart link:=3DA0 http://www.visi.com/~melpots/clayart.html
> new book: http://www.21stcenturykilns.com
> =3D0A=3D0A=3D0A
Michael Wendt on thu 22 oct 09
Loren wrote:
16% bentonite? That seems a little high. One would need a
putty knife to apply it.
Loren,
The values given total to 500 grams making the 16 about 3%
of the total weight. Too bad it was posted that way...
very confusing if the recipe is not totaled at the bottom of
the materials list.
Regards,
Michael; Wendt
Dinah Snipes Steveni on fri 23 oct 09
RE the recipe with 16 bentonite etc. All you had to do was to divide by 5. =
=3D
Making up to 100 for a test is next to useless unless your doing some line =
=3D
blends. Should always X 5 for a decent amount. That's my take.=3D20
Dinah=3DC2=3DA0=3D20
Des & Jan Howard on fri 23 oct 09
Loren
Mel is just being messy.
Recipes by accepted convention* add to 100,
additions extra.
bentonite 3.2
bone ash 12.4
Frit 3195 12
lithium carbonate 5
red iron oxide 8.2
silica 16.4
talc 3.6
Unispar 39.2
Des
* if you don't accept it, tough!
Loren JOnes wrote:
> 16% bentonite? That seems a little high. One would need a putty knife to =
apply it.
> Recipe
> Bentonite 16
> Bone Ash 62
> Frit 3195 60
> Lithium Carbonate 25
> Red Iron Oxide 41
> Silica 82
> Talc 18
> Unispar 196
--
Des & Jan Howard
Lue Pottery
Lue NSW
Australia
2850
02 6373 6419
www.luepottery.hwy.com.au
-32.656072 149.840624
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