ELAINE CARROLL on wed 3 nov 10
I would like to make a plaster mold from a real shrimp.=3DA0 Can someone te=
ll=3D
me how to go about this.=3DA0 Thanks for the help. Elaine
Philip Poburka on wed 3 nov 10
Might work better to make a Plaster Mold from real Plaster instead.
----- Original Message -----
From: "ELAINE CARROLL"
I would like to make a plaster mold from a real shrimp. Can someone tell me
how to go about this. Thanks for the help. Elaine
Snail Scott on wed 3 nov 10
On Nov 3, 2010, at 11:05 AM, ELAINE CARROLL wrote:
> I would like to make a plaster mold from a real shrimp. Can someone
> tell me how to go about this. Thanks for the help. Elaine
The hard part is going to be the thin bits like the tail.
I suggest painting some wax onto the underside of
the tail to thicken it. You will also need to remove
the legs.
Is this for slip casting or press-molding? If for slip,
decide where to put the sprue. Choose a spot with
minimal detail to reconstruct later, or a spot where
it will be attached to something else or otherwise
unseen in the final project. If this is a press mold,
you won't need a sprue.
Choose the parting line, where the two parts of the
mold will separate: probably right down the sides of
the shrimp. Cover the belly with clay, making sure that
the clay extends out from the sides as perpendicularly
as possible, square to the surface of the shrimp. Build
a clay fence around the clay and shrimp, leaving
maybe an inch or so of the smoothed out clay between
the shrimp (the 'pattern') and the fence (the 'cottle'.)
Make sure that you have no undercuts in the exposed
area of the shrimp's back.
Fill the cottle with plaster, enough to cover the shrimp's
back an inch deep. Let it set.
Peel off the clay blocking out the belly of the shrimp.
Coat the plaster with soap (real soap, not the
detergents which are marketed as 'liquid soap').
Rebuild the cottle around the edge of the mold half,
one inch from the belly of the shrimp, and fill with
plaster. Let it set.
Peel off the cottle clay, then tap the mold halves until
they separate, and remove the shrimp. Let the mold
dry, then put to use.
This is a very rough overview, and not a substitute
for proper instruction on moldmaking in general,
which is a lot to put in to an e-mail. If you haven't
done plaster molds before, read up especially on
plaster mixing, and identifying undercuts.
-Snail
John Rodgers on wed 3 nov 10
Oufff!! That will be a good trick - with all those swimmerets, legs,
pincers, antennae, sharp pointed carapace and round knobby eyes. I'm
facing the same issue. I have a mystery crayfish I want to mold, and I
have yet to conceive of a way to do this. My crayfish is a mystery
because when cleaning out from under my molding table in the middle of
my shop - which is a very dry, dusty place where there are stacked glaze
and clay buckets. - I spotted somehting greay on the floor. From the
shape I first thought it to be mole cricket that may have gotten in the
shop and died. When I was close enough I picked it up - and lo and
behold it was crayfish about 2-1/2 inches long. How in the world it got
there i can only conjecture. That table sits in the middle of the room,
15 feet from the nearest door. Very strange.
But I too would like to make a mold off of this creature.
I would like to know how yours turns out if you pursue it.
Thanks,
John
John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com
On 11/3/2010 11:05 AM, ELAINE CARROLL wrote:
> I would like to make a plaster mold from a real shrimp. Can someone tell=
me how to go about this. Thanks for the help. Elaine
>
>
Jacqueline Miller on wed 3 nov 10
Have you thought about using the 2 part silicone that jewelers use. It
come in 2 jars. One pink and one blue. You mix equal parts by kneading
it until it is a uniform purple. You could put it all around the
shrimp or crayfish and when it is cured, cut it in half and remove
your crustacean. You will have molds of both sides. Of course it would
be a press mold not a casting mold. The advantage of the silicone is
that it is flexible and you don't have to worry as much about small
undercuts. In my experience, clay releases quit nicely without any
release agents. It's not cheap, but for little hard shell critters, it
wouldn't be too bad.
Jackie
On 11/3/10, John Rodgers wrote:
> Oufff!! That will be a good trick - with all those swimmerets, legs,
> pincers, antennae, sharp pointed carapace and round knobby eyes. I'm
> facing the same issue. I have a mystery crayfish I want to mold, and I
> have yet to conceive of a way to do this. My crayfish is a mystery
> because when cleaning out from under my molding table in the middle of
> my shop - which is a very dry, dusty place where there are stacked glaze
> and clay buckets. - I spotted somehting greay on the floor. From the
> shape I first thought it to be mole cricket that may have gotten in the
> shop and died. When I was close enough I picked it up - and lo and
> behold it was crayfish about 2-1/2 inches long. How in the world it got
> there i can only conjecture. That table sits in the middle of the room,
> 15 feet from the nearest door. Very strange.
>
> But I too would like to make a mold off of this creature.
>
> I would like to know how yours turns out if you pursue it.
>
> Thanks,
>
> John
>
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.com
>
>
> On 11/3/2010 11:05 AM, ELAINE CARROLL wrote:
>> I would like to make a plaster mold from a real shrimp. Can someone tel=
l
>> me how to go about this. Thanks for the help. Elaine
>>
>>
>
--
Jackie Miller
JackieAMiller@gmail.com
Jeff Longtin on wed 3 nov 10
Hey Elaine,
My advice: As the legs are probably very skinny I would think it would be
impossible to mold them in their entirety. As an alternative I would create
a form of clay that would slip between the legs and then cast the torso in
two pieces.
In other words, think about the shape you want the legs to have in the
final piece. Create a form which supports the legs in that position, then m=
ake
a mold around that.
The result is that the cast piece will have detail on the outside but on
the inside it will be smooth. (If that makes sense?)
Good luck
Jeff Longtin
Minneapolis
Complex Molds Made Easy
In a message dated 11/3/2010 12:24:49 P.M. Central Standard Time,
jetalbot@BELLSOUTH.NET writes:
I would like to make a plaster mold from a real shrimp. Can someone tell
me how to go about this. Thanks for the help. Elaine
Eleanora Eden on wed 3 nov 10
Was just wondering how much detail Elaine was looking for. Seems I have
seen fake shrimps that have legs and so forth, they might be a whole lot
easier to make a mold from than the real item.
Eleanora
> Oufff!! That will be a good trick - with all those swimmerets, legs,
>pincers, antennae, sharp pointed carapace and round knobby eyes. I'm
>facing the same issue. I have a mystery crayfish I want to mold, and I
>have yet to conceive of a way to do this.
--
Bellows Falls Vermont
www.eleanoraeden.com
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