Justin Smith on mon 7 jul 08
Whats the best way to calculate the cost of glaze per batch. I teach for
Clovis Adult School, and am in the process of writing a proposal for
charging lab fees on top of the $98 class fee. Currently that gives the
students one bag of clay. They by their tools and the school has had old
duncon glazes given to them (heavy roll of eyes)
So I need to estimate cost of buy tools, clay and glaze materials for the
school to figure the Lab Fees in the proposal. The school is afraid
charging more money will lose students, but at the same time they spends
$125 per class for clay for students and I can spend whats left, which is
nothing. I know some Glaze programs will do this for me, any suggestions
and what do they cost? Any good online glaze programs that are cheap or
free?
Many thanks for any input. Desperate Teacher for more money.
--
Justin M. Smith
Clovis Adult School, Ceramics
Clovis/Fresno, CA, USA
Potter, Teacher, and always Student....
John Post on mon 7 jul 08
Glazchem is a windows program that is 35 dollars. It will also run on
a Mac if you purchase Parallel's software for $80 or another brand
like it. You can try Glazchem for a month free I think.
To calculate glaze costs, you simply enter in the cost you pay per
pound in the materials list. When you create a recipe you specify the
batch size. You can print the recipe out and it will tell you the
cost per pound of the glaze and the cost per batch that you are
making. Do a google search for glazchem or dinoclay.
Or you could just ballpark it and assume that many of your 5 gallon
batches of clay are going to cost somewhere between $20-30 if there is
nothing unusual in the composition of them.
John Post
Sterling Heights, Michigan
:: cone 6 glaze website :: http://www.johnpost.us
:: elementary art website :: http://www.wemakeart.org
On Jul 7, 2008, at 6:00 PM, Justin Smith wrote:
> Whats the best way to calculate the cost of glaze per batch. I teach
> for
> Clovis Adult School, and am in the process of writing a proposal for
> charging lab fees on top of the $98 class fee. Currently that gives
> the
> students one bag of clay. They by their tools and the school has had
> old
> duncon glazes given to them (heavy roll of eyes)
> So I need to estimate cost of buy tools, clay and glaze materials
> for the
> school to figure the Lab Fees in the proposal. The school is afraid
> charging more money will lose students, but at the same time they
> spends
> $125 per class for clay for students and I can spend whats left,
> which is
> nothing. I know some Glaze programs will do this for me, any
> suggestions
> and what do they cost? Any good online glaze programs that are cheap
> or
> free?
>
> Many thanks for any input. Desperate Teacher for more money.
> --
> Justin M. Smith
> Clovis Adult School, Ceramics
> Clovis/Fresno, CA, USA
>
> Potter, Teacher, and always Student....
>
Timothy Joko-Veltman on mon 7 jul 08
Some programs do have these, but though it is a bit time consuming, it
is not hard to calculate (and the program probably doesn't include
shipping costs). But if you get tired of doing math, then you could
consider making a spreadsheet in Excel or OpenOffice.org Calc to do it
for you.
Here's how you do it:
$/wt = M1+ M2 + M3 + ... + S
Where wt is 1 arbitrary weight unit; M1, etc is cost/wt of Material 1
etc, multiplied by the percentage (in decimal) needed by the glaze
(OR: cost/wt x %); and S is the sum of shipping costs/wt of the
materials.
For example, take the Leach 4-3-2-1 glaze with 0.5% CoO :
40 Potash Feldspar
30 Quartz
20 Whiting
10 Kaolin
0.5 CoO
Suppose Potash Feldspar is $1.80/kg, Quartz $1.50/kg, Whiting $1.60/kg
and Kaolin $1.25/kg. You buy 10kg each of all these from the same
supplier, and shipping is $50, or $50/4kg = $1.25/kg. You buy 0.5kg
of Cobalt Oxide from a different supplier and it costs you $90, or
$180/kg. The shipping for it is $5, or $10/kg. The cost for shipping
of each 1kg batch of this glaze (S) is $1.25/kg + (0.005 x $10/kg) =
$1.30/kg.
The cost of the materials for 1kg of glaze materials is:
M1 = 1.80 x 0.4 = 0.72
M2 = 1.50 x 0.3 = 0.45
M3 = 1.6 x 0.2 = 0.32
M4 = 1.25 x 0.1 = 0.125
M5 = 180 x 0.005 = 0.90
S = 1.30
= 0.72 + 0.45 + 0.32 + 0.125 + 0.90 + 1.30
= $3.815/kg
Cheers,
Tim
On Mon, Jul 7, 2008 at 7:00 PM, Justin Smith wrote:
> Whats the best way to calculate the cost of glaze per batch. I teach for
> Clovis Adult School, and am in the process of writing a proposal for
> charging lab fees on top of the $98 class fee. Currently that gives the
> students one bag of clay. They by their tools and the school has had old
> duncon glazes given to them (heavy roll of eyes)
> So I need to estimate cost of buy tools, clay and glaze materials for the
> school to figure the Lab Fees in the proposal. The school is afraid
> charging more money will lose students, but at the same time they spends
> $125 per class for clay for students and I can spend whats left, which is
> nothing. I know some Glaze programs will do this for me, any suggestions
> and what do they cost? Any good online glaze programs that are cheap or
> free?
>
> Many thanks for any input. Desperate Teacher for more money.
> --
> Justin M. Smith
> Clovis Adult School, Ceramics
> Clovis/Fresno, CA, USA
>
> Potter, Teacher, and always Student....
>
Ben Shelton on tue 8 jul 08
I use Glazemaster and I am very pleased with it.
Same as most other programs there is a fully
functional 60 day trial version. Input your glazes
and the costs of your materials along with your batch
size and presto, it'll tell you the cost per batch.
http://www.masteringglazes.com/Pages/Downloadframe.html
Ben
iglasgo on tue 8 jul 08
Have you all had trouble getting Glazechem to run on Windows Vista or
is it just me? For me it does not run on Vista at all.
-Ivy G-
--- In clayart@yahoogroups.com, John Post wrote:
>
> Glazchem is a windows program that is 35 dollars. It will also run on
> a Mac if you purchase Parallel's software for $80 or another brand
> like it. You can try Glazchem for a month free I think.
>
> To calculate glaze costs, you simply enter in the cost you pay per
> pound in the materials list. When you create a recipe you specify the
> batch size. You can print the recipe out and it will tell you the
> cost per pound of the glaze and the cost per batch that you are
> making. Do a google search for glazchem or dinoclay.
>
> Or you could just ballpark it and assume that many of your 5 gallon
> batches of clay are going to cost somewhere between $20-30 if there is
> nothing unusual in the composition of them.
>
> John Post
> Sterling Heights, Michigan
>
> :: cone 6 glaze website :: http://www.johnpost.us
> :: elementary art website :: http://www.wemakeart.org
>
>
>
>
>
>
> On Jul 7, 2008, at 6:00 PM, Justin Smith wrote:
>
> > Whats the best way to calculate the cost of glaze per batch. I teach
> > for
> > Clovis Adult School, and am in the process of writing a proposal for
> > charging lab fees on top of the $98 class fee. Currently that gives
> > the
> > students one bag of clay. They by their tools and the school has had
> > old
> > duncon glazes given to them (heavy roll of eyes)
> > So I need to estimate cost of buy tools, clay and glaze materials
> > for the
> > school to figure the Lab Fees in the proposal. The school is afraid
> > charging more money will lose students, but at the same time they
> > spends
> > $125 per class for clay for students and I can spend whats left,
> > which is
> > nothing. I know some Glaze programs will do this for me, any
> > suggestions
> > and what do they cost? Any good online glaze programs that are cheap
> > or
> > free?
> >
> > Many thanks for any input. Desperate Teacher for more money.
> > --
> > Justin M. Smith
> > Clovis Adult School, Ceramics
> > Clovis/Fresno, CA, USA
> >
> > Potter, Teacher, and always Student....
> >
>
John on tue 8 jul 08
Getting a Glaze Program just to determine the cost of a batch is =
probably overkill. Just assume that 1000 grams is 2 pounds of material. =
(454 grams in a pound)
So if you make 10000 grams you are using 20 pounds of material.
Then figure the cost of of each material in relation to the total. This =
varies because if you buy 5 pounds of material it usually costs a lot =
more than if you buy 2000 pounds. E.g. at Highwater Dolomite can run =
from $1 a pound to 0.11 cents depending on how much you buy. I try to =
bundle my purchase with a clay purchase and then you can get it at the =
cheapest price.
And if you are making a cone 6 glaze, it may cost more because you use =
more expensive fluxes, like Zinc Oxide and frits while most cone 10 =
glazes are fluxed with feldspar and whiting.
Then the cost of the colorants varies.
As John Post said, it is probably safe to estimate about $10 to $20 a =
bucket. =20
John Britt
www.johnbrittpottery.com/wks.htm
http://ncclayclub.blogspot.com/
Lee Love on wed 9 jul 08
I could send you NCC's materials list. It includes cost per gram.
I highly recommend Glazechem. You can test it for 45 days
before you buy it, fully functioning.
--
Lee Love in Minneapolis
http://mashikopots.blogspot.com/
http://claycraft.blogspot.com/
"Let the beauty we love be what we do.
There are hundreds of ways to kneel and kiss the ground." --Rumi
Des & Jan Howard on wed 9 jul 08
Ivy
Go to:
to see Bob's explanation. Contact Bob Wilt directly,
I found him prompt & friendly.
I ran GlazeChem on Win 98 flawlessly then switched to XP still no hiccups.
As for glaze costing. We take the kilogram price of the dearest bulk
material we get from our local reseller, in our case 400# silica
A$42.20/25 kg, & use this as the kg cost of all glazes. Cost of oxides &
other colourants are ignored.
Des
iglasgo wrote:
> Have you all had trouble getting Glazechem to run on Windows Vista or
> is it just me? For me it does not run on Vista at all.
> -Ivy G-
--
Des & Jan Howard
Lue Pottery
Lue NSW
Australia
2850
02 6373 6419
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