Jeff Tsai on wed 10 apr 02
A rather interesting question. essentially you asked is sanding the greenware
pots would somehow benefit them since you won't be burnishing.
Well, burnishing would give you a smooth, satin to glossy surface. However,
sanding has a more or less opposite effect. The surface will not shine and
will not be smooth like a functional glazed surface.
However, if your ware is very bumpy, perhaps it is coil and pinched rather
than thrown, or thicker in some areas, sanding can help. YOu can sand down
thick areas so that the pot is more uniform. You can sand in one direction so
that all the marks on the surface move in one direction. Most Native potters
sand their pieces in one way or another, whether it is with green scrub pads,
sand paper or corn cobs. IF your work is well thrown wheel pottery, I don't
see much reason for sanding, but bumpy coil pieces might be given a more
uniform sense if sanded well. It will not change the glossiness or feel of
the surface too much, it will still feel like dry clay. In any event,
remember to wear a good dust mask while sanding.
-jeff
BVCuma on thu 11 apr 02
>>after they are fired,
are sanded, polished with a 3M pad and then rubbed with a soft cotton =
cloth.
They end up with a satin finish.<<
_____________________________
=20
Hi Lee,
I imagine you are getting into higher cones
and are producing vitrified wares...
Sanding, polishing etc.
would be akin to doing the same to stone
with much the same effect.
I wonder with the lower temp of a pit firing
you could produce the satin sheen.
I think of a bisqued pot
and doubt it...
at least not without a wax finish or something.
Particularly in relation to achieving a waterproof seal.
Alignment of the clay platelets etc.=20
As is or was one of the main reasons for this technical development.
=20
Bruce =20
Longtin, Jeff on mon 15 apr 02
Bruce,
The doll making world regularly uses the sanding technique to give doll
heads a nice smooth appearance. They are most often using a porcelain
casting slip of course and it is a much finer clay than most stoneware
throwing bodies but still it makes a big difference.
They do the first bisque at cone 018. They use wet/dry sandpaper with a
little water.
Jeff Longtin
-----Original Message-----
From: BVCuma [mailto:bvcuma@PACIFIC.NET.IN]
Sent: Thursday, April 11, 2002 12:26 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Burnishing vs. Sanding
>>after they are fired,
are sanded, polished with a 3M pad and then rubbed with a soft cotton cloth.
They end up with a satin finish.<<
_____________________________
Hi Lee,
I imagine you are getting into higher cones
and are producing vitrified wares...
Sanding, polishing etc.
would be akin to doing the same to stone
with much the same effect.
I wonder with the lower temp of a pit firing
you could produce the satin sheen.
I think of a bisqued pot
and doubt it...
at least not without a wax finish or something.
Particularly in relation to achieving a waterproof seal.
Alignment of the clay platelets etc.
As is or was one of the main reasons for this technical development.
Bruce
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