Twas I.
In fact I also suggested that a UV curing resin might work and did some
research with materials science people.
Follow this.
One of the problems in UV curing resins is shrinkage. More light = more
shrinkage. Ther trick is not to make it shrink. Shrinkage is what we want.
As for casting I tried it and the resins melt the gelatin. At least the
ones I tried. Your best bet to try is that seaweed white stuff used to make
face casts etc. It does not heat up when it cures. Tri-Ess in Burbank Ca.
carries it. It's soft and rubber so you'd need to make a harder second
generation cast from it from some other material. Dental castings are
within a micron.
--Dick Sullivan
t 08:46 AM 12/7/99 -0700, you wrote:
>On Mon, 6 Dec 1999, Pollmeier Klaus wrote:
>
> > harden and dry. You will then need lead plates ca. 3/4 to 1 cm thick. With
> > a press, that provides a pressure of ca. 500 kg per square centimeter, you
> > now press the relief into the lead.
>
>This is true if you restrict yourself to 19th century equipment and
>materials. However, someone on this list mentioned replacing the lead
>plates with a plastic casting resin. I don't remember who said that, but
>I thought is was a very clever idea. I don't suppose that the person who
>offered that idea is still here and would like to comment further?
>
>- Wayde
> (wallen@boulder.nist.gov)
505-474-0890 FAX 505-474-2857
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