John Jensen on fri 22 feb 02
Why does the first inch or so of an extrusion curl up as it comes out?
John Jensen, Mudbug Pottery, Annapolis
mudbug@toad.net, Toadhouse.com=20
Janet Kaiser on sat 23 feb 02
It is just behaving like any mass of a substance which has been
squeezed through a small orifice... From clay to riced potatoes,
frosting/icing to spaghetti. Even that technique of pushing clay
though a sieve to create "hair" or other decoration, will curl at
first... There probably is some complicated physical law governing
and/or explaining the phenomena, but like those other "useless"
research projects which take years and mega-money to finance, who will
understand the scientific answer? Like the Belgian professor who has
been researching dripping teapots for 20+ years and the Cambridge
University team who came up with why if you drop a slice of bread on
the floor, it will _usually_ land on the buttered side.
Janet Kaiser
The Chapel of Art / Capel Celfyddyd
Home of The International Potters' Path
8 Marine Crescent : Criccieth : GB-Wales
URL: http://www.the-coa.org.uk
postbox@the-coa.org.uk
----- Original Message -----
Why does the first inch or so of an extrusion curl up as it comes out?
Ingeborg Foco on sun 24 feb 02
The French have a saying for things that are difficult to explain or things
they simply don't wish to explain....... With a shrug of the shoulders and
a roll of the eyes "Parceque ce comme ca" - translation....because, that's
the way it is!!
Ingeborg
> ----- Original Message -----
>
> Why does the first inch or so of an extrusion curl up as it comes out?
>
>
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Jim V Brooks on mon 25 feb 02
the extrusion that comes out "curled" is due to uneven pressure forcing the
clay thru the dies... If you have a large extruder.. then you need to make
sure that the die is centered so equal pressure is exerted to all the surface
of the clay. and the clay extruded will be straight...
This can be a pain... and i finally decided i didn't really care.. i use the
curved pieces also.. and have fun making strange shapes.. Do you have any
idea how many shapes a teapot can be? Have fun.. Jim in Dallas
Susan Cline on mon 25 feb 02
Sounds so much nicer, and more reasonable, in French.....
-----Original Message-----
From: Ingeborg Foco
Date: Sun, 24 Feb 2002 18:03:21 -0500
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: extruder mystery
> The French have a saying for things that are difficult to explain or things
> they simply don't wish to explain....... With a shrug of the shoulders and
> a roll of the eyes "Parceque ce comme ca" - translation....because, that's
> the way it is!!
>
> Ingeborg
>
>
>
> > ----- Original Message -----
> >
> > Why does the first inch or so of an extrusion curl up as it comes out?
> >
> >
> ____________________________________________________________________________
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--
Steve Mills on mon 25 feb 02
Pressure distortion, if you hand guide it, it helps.
Steve
Bath
UK
In message , John Jensen writes
>Why does the first inch or so of an extrusion curl up as it comes out?
>
>John Jensen, Mudbug Pottery, Annapolis
>mudbug@toad.net, Toadhouse.com=3D20
--
Steve Mills
Bath
UK
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