Jeff Lawrence on sat 1 feb 97
Hi,
We are frustrated at our clay body in using it on our jolly jigger (Yo Ho!).
Too wet and it shrinks so much off the mold that it cracks. Too dry and it
freezes up the spindle or tears off.
Any advice on how to get clay just right? I think Kenny says jiggering clay
should be a little shorter than throwing clay. Chappell seems to think the
same clay body works fine for both. It occurred to me that deflocculation
would give me a softer body without increasing the water content, but others
wiser than I am say deflocculated bodies are a flabby pestilence, to be
avoided at all costs.
Thanks in advance for any help or direction to reference works that describe
the process in detail (all my books give it a minute and call it a day).
Jeff Lawrence
Sun Dagger Design
Rt 1 Box 394L
Espanola NM 87532
ph/fax 505-753-5913
Denis Whitfield on mon 3 feb 97
>----------------------------Original message----------------------------
>Hi,
>
>We are frustrated at our clay body in using it on our jolly jigger (Yo Ho!).
>Too wet and it shrinks so much off the mold that it cracks. Too dry and it
>freezes up the spindle or tears off.
>
>Any advice on how to get clay just right? I think Kenny says jiggering clay
>should be a little shorter than throwing clay. Chappell seems to think the
>same clay body works fine for both. It occurred to me that deflocculation
>would give me a softer body without increasing the water content, but others
>wiser than I am say deflocculated bodies are a flabby pestilence, to be
>avoided at all costs.
>
>Thanks in advance for any help or direction to reference works that describe
>the process in detail (all my books give it a minute and call it a day).
>
>
>
>
>
>Jeff Lawrence
>Sun Dagger Design
>Rt 1 Box 394L
>Espanola NM 87532
>ph/fax 505-753-5913
>
>
Jeff,
We make jigger/jolly platters up to about 600mm diameter using a fine
earthenware clay. We use the same clay for throwing.
I don't think clay for jigger/jolly work needs to be specially formulated.
What I think is VERY important is the design of the plaster mould and I
recommend that you look at this area to solve your cracking problems. In
particular, the design needs to allow you to remove the work early - we use
compressed air to assist in removal.
Regards
Denis
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DR DENIS WHITFIELD
Senior Lecturer
Co Director, Centre for Ceramic Research, Design and Production
Department of Visual and Peforming Arts
University of Western Sydney, Macarthur
PO Box 555
CAMPBELLTOWN NSW 2560
AUSTRALIA
email: d.whitfield@uws.edu.au
phone: 02 97729345
fax: 02 97723244
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