On Thu, 20 Jan 2005 10:55:18 -0800, James Washer <
washer@...> wrote:
>
> Ron,
> thanks for providing this... but can you provide a bit more info?
> Any "name brand" silicon I should buy?
> I have a vacuum pump... but I cannot figure out how I would attach it to
> a rubber mold.. would that just collapse the
> mold?
> Do you have any pictures?
> - jim
you don't vacuum the mold, you need a small vacuum chamber in which you
put the container of silicone or whatever you want to use to cast. the
vacuum makes the bubbles HUGH and causes them to rise to the surface,
effectively de-gassing the liquid. then you take the liquid out and cast
with it.
Of course you can also vacuum the un-cured mold and pattern just after
casting if it fits into the chamber.
You can join <
http://groups.yahoo.com/group/casting/> for more information.
I was looking into it a short while back, but decided it is too expensive
and i have enough stuff to do right now. But it opens a lot of
possibilities...
ST