Cathy Elliot on thu 14 dec 06
I have just bought several Slump/Hump molds. I haven't worked with this type of mold before. I am
planning to make some plates and platters, and was wondering which type of mold I should make
from the plastic forms I received. The form will make either a Slump OR a Hump mold. I do have a
small slab roller, so I will be using that after I have made the mold. Any of you who have had
experience with this type of mold please give me advice. Thank you.
Marcia Selsor on thu 14 dec 06
Cathy,
I have used /made large hump molds witha systen of bats for lifting
off without warping the lips. Linda
Blossom uses this idea for her sink hump molds. I adapted it to
birdbaths and large oval and round forms.
See my article on Bird baths in PMI for photo explanation of the bat
system.
Slump molds can be flipped over with a board to remove the clay form
without distortion.
It is a matter of choice.
Marcia Selsor
http://marciaselsor.com
On Dec 14, 2006, at 1:55 AM, Cathy Elliot wrote:
> I have just bought several Slump/Hump molds. I haven't worked with
> this type of mold before. I am
> planning to make some plates and platters, and was wondering which
> type of mold I should make
> from the plastic forms I received. The form will make either a
> Slump OR a Hump mold. I do have a
> small slab roller, so I will be using that after I have made the
> mold. Any of you who have had
> experience with this type of mold please give me advice. Thank you.
William & Susan Schran User on thu 14 dec 06
On 12/14/06 2:55 AM, "Cathy Elliot" wrote:
> I have just bought several Slump/Hump molds. I haven't worked with this type
> of mold before. I am
> planning to make some plates and platters, and was wondering which type of
> mold I should make
> from the plastic forms I received. The form will make either a Slump OR a Hump
> mold.
You can make both the hump & lump molds, which you use will depend on the
form created and how you want to work on it.
Hump mold if you are more interested in the exterior of the form, adding
foot ring/appendages, etc.
Some forms will require removal from the plaster mold before the clay begins
to dry & shrink.
Or slump mold if you're more concerned with the interior, doing some slip
decoration techniques, etc.
The clay can dry in the mold, unless added foot treatments are needed
But, as far as I'm concerned, it's often a matter of preference.
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
Kathy McDonald on thu 14 dec 06
Cathy,
If you have enough plaster and time I would encourage you
to make one of each. I am not sure whether you have
purchased
the Pure and Simple forms or not, but if you did I know they
have options to do both from each plastic container.
http://www.pspottery.com/
I find the hump molds somewhat easier to work with because
the platters I like to make are quite rustic with free form
edges,
and I carve designs into the plaster that appear as a raised
surface
when lifted from the mold. People always ask,,,how did you
do that
when they see the raised decoration on the inside. Also
makes
wonderful natural "glaze walls" when you decorate if you use
multiple glaze layers.
Also customers tend to like this type of platter for serving
roasts
because the raised areas keep the meat from sitting in extra
fat
or juice.
The slump molds make a really clean crisp form on the
outside but do
require taking a lot of care to ensure the top of the form
is level and
even, and, you need some practice to get the slab thickness
right.
Drying the pieces slowly is also important to prevent
warping, but
this seems to be more critical with the slump molded forms.
Others will have ideas about what tools to use to work with
the clay
when you are making a slumped form, everyone has their
favorites but
I prefer a sponge and the "Mudtools"
,http://www.mudtools.com/ .
I sound like a walking advertisement for these companies
but these tools are
really useful (usual disclaimers).
Others will likely chime in with their favorites as well.
.
Takes a while to learn to use them but well worth the
effort.
Kathy
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG]On Behalf Of
Cathy Elliot
Sent: Thursday, December 14, 2006 1:55 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Slump or Hump Mold?
I have just bought several Slump/Hump molds. I haven't
worked with this type of mold before. I am
planning to make some plates and platters, and was wondering
which type of mold I should make
from the plastic forms I received. The form will make either
a Slump OR a Hump mold. I do have a
small slab roller, so I will be using that after I have made
the mold. Any of you who have had
experience with this type of mold please give me advice.
Thank you.
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