iandol on wed 21 aug 02
It just occurred to me that there may be some confusion in peoples =
mind's.
I have been talking about throwing a pot in its normal orientation, base =
at the wheel head, rim in the air. by locating my hands at the rim of =
the preformed cylinder, pinching to thin the clay as it rotates and =
indexing my hands down to the wheel head, the opposite of "Throwing Up". =
This takes advantage of the mechanical strength of the clay below the =
active point of deformation, where fingers do their work.
To me, throwing "Upside down" means that the clay in contact with the =
wheel head will become the rim while that which rotates in free air will =
be collared in until it coalesces to be shaped into a foot ring. This is =
the ideal way to make tall rotund pots which have very narrow bases =
which could not be achieved because the compressive strength of the =
small volume of clay would be insufficient to support the mass of clay =
which sits on the footring.
You are working with a bottomless cylinder of clay when you throw upside =
down.
Hope that clears up any misunderstanding.
Want Demonstrations?
Best regards,
Ivor Lewis. Redhill, South Australia.
Deborah Pratt on thu 22 aug 02
Clayarters,
Does anyone know of a video of this process?
Deb
iandol wrote:It just occurred to me that there may be some confusion in peoples mind's.
I have been talking about throwing a pot in its normal orientation, base at the wheel head, rim in the air. by locating my hands at the rim of the preformed cylinder, pinching to thin the clay as it rotates and indexing my hands down to the wheel head, the opposite of "Throwing Up". This takes advantage of the mechanical strength of the clay below the active point of deformation, where fingers do their work.
To me, throwing "Upside down" means that the clay in contact with the wheel head will become the rim while that which rotates in free air will be collared in until it coalesces to be shaped into a foot ring. This is the ideal way to make tall rotund pots which have very narrow bases which could not be achieved because the compressive strength of the small volume of clay would be insufficient to support the mass of clay which sits on the footring.
You are working with a bottomless cylinder of clay when you throw upside down.
Hope that clears up any misunderstanding.
Want Demonstrations?
Best regards,
Ivor Lewis. Redhill, South Australia.
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iandol on fri 23 aug 02
Dear Deborah Pratt,=20
It may be that one of the people who produce video throwing programs has =
done the "Throwing Upside Down" thing since this is a commonly used =
process for making large pots from one piece of clay. Jepson or Hopper =
may have done it and I think it is described in the usual books
But "Throwing Down", I doubt this very much. You would be hard pressed =
to find a description of it in sufficient detail to reproduce the =
effect, unless you had a lot of experience to fall back on and were =
willing to have colossal failure to begin with. It is a process which =
demands an act of faith and a certain degree of recklessness, as well as =
the ability to centre and cone up to the limits of the yield point of =
your clay and a high degree of muscular control. It is one of the =
processes many people would believe to be impossible.
But it was a good idea to ask.
Best regards,
Ivor.
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