mel jacobson on sat 24 oct 09
this has been posted often on clayart, but those
that make big batches.
do this:
grams X .0022 =3D pounds.
i have converted all my standard recipes to
pounds.
i have a good store type scale.
for example.
rhodes 32 mel's
11 pounds of feldspar or/33lbs.
5 1/2 pounds of epk or /16 1/2 lbs.
5 1/3 pounds of dolomite (you get the idea)
3/4 pound of whiting.
add to taste a couple of pounds
of silica depending on gloss wanted.
to that:
quarter pound of rutile/iron mix.
the silica and rutile add stability.
iron and rutile add a touch of brown/tan/oatmeal.
i triple this for a 50 gallon plastic garbage can on
wheels.
i then remove five gallon pails and add cobalt, chrome
or scrap black/brown/taconite. this is always underglaze.
if i make a sample glaze...i use my gram scale. measure
rather carefully, but only one decimal point.
if the recipe comes from a trusted potter that has a track
record, i make five gallons...and fire about 20 pots in the new
glaze. i never make tiles or scrap tests. i have to see the new
glaze on real pots. and, to be quite frank, there is always a customer
that will love that new glaze even if i hate it.
out the door. bill merrill sent me a note to experiment with talc
and zircopax. so, i added it to the mix. it sure won't hurt anything
and the glaze will change a bit. bill knows the score, i have no fear
of trusting him.
if i was to have trouble with a glaze, did not know what to do,
i would hire ron roy to fix it for me. pay him a few bucks and get
it right the first time. how much does it cost to ruin a kiln full of pots=
?
couple thousand bucks.
there have been some fine potters on this list who have gone to
ron and others to fix their clay issues. worth every penny.
if i was doing porcelain, i would ask david buamee. he would know.
call jon at laguna and have a consult.
why not?
my god, think of the gift i have with joe koons being a partner and
best friend. i bet i ask him questions, and he always knows the answer.
mel
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
new book: http://www.21stcenturykilns.com
tony clennell on sat 24 oct 09
Mel: One day America will convert to metric but not for rational
reasons. It will be a very sneaky way of having you believe that gas
is still cheap. I still think in gallons, pounds even after decades of
metric. What they will do is convert to litres and you will drive into
your gas station for the 94 cent litre of gas and think man gas is
still cheap. To get a US gallon you need to multiply by 3.7 and you
will get your $3.50 gallon. Last summer we were up to $1.40 per litre.
A good way to pay for your gas is to use paper money. It gives you a
real sense of how much it costs to drive your car when you hand over 3
$20 bills to fill a Subaru Outback. I would be sick to my stomach if I
had to fill a Dodge Hemi 4 x4.
Slow here today.
Cheers,
Tony
--
http://sourcherrypottery.com
http://smokieclennell.blogspot.com
Lee Love on sat 24 oct 09
I just bought 5 lbs of alumina oxide at Continental for one of my
shinos. It is so expensive, I don't buy more than that at a time.
So, when I mix it up, I have to adjust the rest of the recipe to the
5 lbs.
--
Lee, a Mashiko potter in Minneapolis
http://mashikopots.blogspot.com/
"Ta tIr na n-=3DF3g ar chul an tI=3D97tIr dlainn trina ch=3DE9ile"=3D97tha=
t is, "T=3D
he
land of eternal youth is behind the house, a beautiful land fluent
within itself." -- John O'Donohue
douglas fur on mon 26 oct 09
Mel
Grams to lb.s Uffda
If you multiply 40g:30g:20g:10g by .0022 you'd get
.088lb.s:.066lb.s:.044lb.s:.022 lb.s
I think its easier to stick to the pure math of the ratios
If you're mixing 4:3:2:1 it could be-
4lb spar, 3lb silica, 2lb whiting, 1lb clay or
40oz spar, 30 oz silica, 20 oz whiting, 10oz clay or
4 quarter lb spar, 3quarter lb silica, 2 quarter lb whiting, 1 quarter lb
clay
you could even put your cat on a balance scale and do-
4x your cat's weight of spar, 3x your cat's weight of silica, 2x your cat'=
s
weight of whiting, 1x your cat's weight of clay
As long as the ratios stay the same it doesn't make a difference what the
units are.
It's like the old joke "You can call me anything you want but don't call me
late for lunch"
"grams X .0022 =3D pounds." leaves me hungry.
DRB
Seattle
On Sat, Oct 24, 2009 at 8:14 AM, mel jacobson wrote:
> this has been posted often on clayart, but those
> that make big batches.
> do this:
> grams X .0022 =3D pounds.
>
> i have converted all my standard recipes to
> pounds.
>
> i have a good store type scale.
>
> for example.
>
> rhodes 32 mel's
> 11 pounds of feldspar or/33lbs.
> 5 1/2 pounds of epk or /16 1/2 lbs.
> 5 1/3 pounds of dolomite (you get the idea)
> 3/4 pound of whiting.
> add to taste a couple of pounds
> of silica depending on gloss wanted.
> to that:
> quarter pound of rutile/iron mix.
> the silica and rutile add stability.
> iron and rutile add a touch of brown/tan/oatmeal.
>
> i triple this for a 50 gallon plastic garbage can on
> wheels.
>
> i then remove five gallon pails and add cobalt, chrome
> or scrap black/brown/taconite. this is always underglaze.
>
> if i make a sample glaze...i use my gram scale. measure
> rather carefully, but only one decimal point.
>
> if the recipe comes from a trusted potter that has a track
> record, i make five gallons...and fire about 20 pots in the new
> glaze. i never make tiles or scrap tests. i have to see the new
> glaze on real pots. and, to be quite frank, there is always a customer
> that will love that new glaze even if i hate it.
> out the door. bill merrill sent me a note to experiment with talc
> and zircopax. so, i added it to the mix. it sure won't hurt anything
> and the glaze will change a bit. bill knows the score, i have no fear
> of trusting him.
>
> if i was to have trouble with a glaze, did not know what to do,
> i would hire ron roy to fix it for me. pay him a few bucks and get
> it right the first time. how much does it cost to ruin a kiln full of
> pots?
> couple thousand bucks.
>
> there have been some fine potters on this list who have gone to
> ron and others to fix their clay issues. worth every penny.
> if i was doing porcelain, i would ask david buamee. he would know.
> call jon at laguna and have a consult.
> why not?
> my god, think of the gift i have with joe koons being a partner and
> best friend. i bet i ask him questions, and he always knows the answer.
> mel
> from: minnetonka, mn
> website: http://www.visi.com/~melpots/
> clayart link: http://www.visi.com/~melpots/clayart.html
> new book: http://www.21stcenturykilns.com
>
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