Bryan Hannis on mon 2 may 11
Hi
I have a thread die and have used it on fresh thrown soap pump bottles. T=
=3D
he
pump fits nicely when the bottle is dry, but I don't think the fit will b=
=3D
e
very good after bisque and glaze firings. How is one suppose to use the d=
=3D
ie,
when the clay is leather hard??
Bryan Hannis
David Hendley on tue 3 may 11
----- Original Message -----
>I have a thread die and have used it on fresh thrown soap pump bottles. Th=
e
>pump fits nicely when the bottle is dry, but I don't think the fit will be
>very good after bisque and glaze firings. How is one suppose to use the
>die,
>when the clay is leather hard??
>
The dies I own are aluminum, bought from Salt Spring Pottery in Canada
about 15 years ago. I use them as you did, immediately after throwing.
These are not really "dies", which implies a tool that cuts the material it
is
threading. They are simply rings of aluminum that are threaded. In use,
the die is set around a clay neck and the clay is then expanded to push
the clay into the threads. The dies are soaked in mineral oil, for easy
removal once the clay has dried a little.
My claybody shrinks about 13%, and the dies are perfectly sized so a
lotion pump will fit after firing. If your pump fits when the clay is dried
but
unfired, it will probably not fit after firing. I leave the threaded clay
necks
unglazed. Perhaps if you glazed the threads it would increase the size
enough to make a pump fit after firing?
David Hendley
david@farmpots.com
http://www.farmpots.com
http://www.thewahooligans.com
Eric Ciup on thu 5 may 11
On 2:59 PM, Bryan Hannis wrote:
>
> Hi
>
> I have a thread die and have used it on fresh thrown soap pump
> bottles. The
> pump fits nicely when the bottle is dry, but I don't think the fit will b=
e
> very good after bisque and glaze firings. How is one suppose to use
> the die,
> when the clay is leather hard??
>
> Bryan Hannis
>
If your threads are shrinking too much you can make them as press molds
separately from the pot. That allows you to use stiffer clay which
should give you less shrinkage.I f it is still too much you can use a
clay with less drying and firing shrinkage. To make the hole in the
middle I use a piece of 3/4" copper pipe. I always use wd40 oil for a
mold release. I find this method much quicker than molding the threads
on top of a soft freshly thrown pots and I can use one die to make a
whole whack of threads at once. I use the aluminum die sold by
Saltspring Pottery.
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