Homebrew PCBs

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