sgoldate@melbpc.org.au on mon 3 jun 02
I didn't see the original posting re. plaster problems, but it appears you
had a 'blow out'. This has happened to me a co=
uple of times too. In one or two instances they involved very large molds,
taking about 20-25 liters of slip... You can c=
ast in a large tub to catch the slip, if this happens, but better to prevent
it in the first place.
I got so fed up with the problem I devised a no-fail system which might be
of interest to other potters. what you do is w=
hen you make the mold, make it with flanges along the sides. After the mold
has dried, drill holes through these flanges,=
into which you insert bolts long enough for the purpose. Nuts on the other
side will hold the pieces together firmly - n=
o more blow outs, ever! To protect the plaster (if this is an isssue), you
can use rubber rings, all of which is availabl=
e in hardware stores.
Steven
Original Message:
-----------------
From: Sarah House shouse@MCDOWELL.MAIN.NC.US
Date: Sun, 2 Jun 2002 15:10:29 -0400
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: plaster results
Thanks everyone for the advice on pouring plaster. I did have a seam blow,
but didn't lose too much plaster. Next time I will use plastic all the way
around to keep everything in it's place.
Sarah
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Snail Scott on tue 4 jun 02
At 07:53 PM 6/3/02 -0400, you wrote:
>...when you make the mold, make it with flanges along the sides. After the
mold has dried, drill holes through these flanges, into which you insert
bolts long enough for the purpose.
This is standard practice for the wax-casting molds
used for bronze sculpture. These molds can be quite
large and when filled with hot wax, the last thing
you want is a leak. Mold straps are OK for smaller
things, but the outward pressure of gallons of any
fluid may require a more substantial fastening.
Bolting a mold together also helps prevent shifting
of sections, which can be an issue with older molds
whose keys have worn down.
By the way, if you use threaded rod cut to length,
you need not be limited by the available sizes of
bolts.
-Snail
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