Clay Times Back Issues Vol. 2 Issue 4 • May/June 1996 | Page 14
Mixing Your Own Clay
to formulate your own clay can be
rewarding in many ways.
When you stock your raw
materials on-site, mixing your own
clay affords a steady supply of
moist clay for production. You can
mix as little or as much clay as necessary for a specific project. Several
different clay body formulas can be
mixed and stored until they are
needed. Also, a wide variety of clay
body formulas can be mixed and
tested in a relatively short time.
Yet mixing your own clay is
labor intensive. The most expensive part of making ceramic objects
is the labor involved in producing
the work. And every hour spent
ordering, stacking and mixing clay
is an hour not spent making pots.
Think of mixing your own clay as
starting a clay mixing business
(with yourself as the customer) to
supply your other business (the
production of ceramic objects).
B LU E B I R D
Manufacturing, Inc.
Post Office Box 2307
Fort Collins, CO 80522-2307
Powerstar I
Vacuum Pugmill
Optional
Stand
Tel.: (970) 484-3243
Fax: (970) 493-1408
Internet e-mail: [email protected]
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continued from page 11
Once the decision is made to mix
clay, there will be two businesses to
finance, manage, and maintain. At
some point, it will be counter-productive to keep moving backward
in the production cycle, considering the additional expense that
must be added to the original cost
of producing ceramic objects.
Purchasing clay mixing
machinery is expensive, and one
should also consider the cost of
equipment maintenance and repair.
Buying and maintaining a pug mill
and clay mixing machine can use
up money that could be appropriated to other business expenses
which might return a greater profit.
Then again, recycling and re-use of
your clay can save you money,
too...and the purchase of dry ingredients in bulk also offers considerable savings.
If you choose to buy clay mixing equipment, note that the purchase of a smaller machine than
necessary will result in slower clay
production and possibly higher
maintenance costs due to inadequate power. If you buy a machine
that’s too large, it will consume
space and greater amounts of capital, and result in unused production capacity. Before you buy, it’s
wise to research as many different
clay mixers and pug mills as possible, and try to speak with persons
who actively use the equipment to
determine the best machine for
your individual production needs.
Do you have adequate space
for mixing equipment and for storing dry clay ingredients? Ordering
of dry clays should be done in a
way that ensures a steady supply
to avoid delays in clay mixing
operations. The greater the quantity of dry materials purchased, the
lower the cost per pound. Clay
mixing areas need to be located
away from your regular workspace, as the dust generated is
extremely harmful to inhale. Yet
the closer you locate the mixing
area to your workspace, the more
time and trouble you’ll save by
moving clay as little as possible.
Buying Pre-mixed Clay
When you pick up the phone
to order conveniently packaged,
moist clay, you let the professionals
take charge of what they do best:
the blending of clays under accurate, quality control conditions.
Many suppliers will give free samples of stock clay to help you settle
on a formulation that’s right for
your individual needs. The clay
manufacturer should be knowledgeable about the current “track
record” of every type of clay, and
take care to identify irregular shipments from the mines. If pre-mixed
clay is an option, select a clay supplier with a good reputation for
quality and customer service.
Once you’ve received your premixed clay, keep a record of the
batch code number listed on each
box you use, in case you experience
trouble with the clay during forming or firing. If possible, mark each
of your pots with a code that corresponds to the supplier’s code. In
this way, a bad batch of clay can be
isolated and traced back to the
ceramics supplier’s coded batch of
clay. If other potters had problems
with that particular batch of clay,
the supplier should have a record
and you’ll have a better chance of
isolating the problem and obtaining a replacement batch of clay. ■
Author Jeff Zamek operates a
ceramics consulting service. He may be
reached at: 6 Glendale Woods Drive;
Southampton, MA 01073, (413) 5277337.
Tune in to future issues of
Clay Times for features on purchasing pug mills and clay mixers,
and how to perform the clay mixing process. —Ed.