Must-have PDP-11 ... GOLD PLATING AND SWITCH HANDLES

[Heinz Wolter]

From: "vrs" <vrs at msn.com> wrote
To: "Heinz Wolter"
Subject: Re: Must-have PDP-11 ... GOLD PLATING AND SWITCH HANDLES

> No, but the strength of the poured ones is adequate, once they have cured.
> (When they first come out of the molds, they are still too flexible.)
>
> The silicone rubber molds give a pretty good result.  The hard problems
are
> getting the color right and the air bubbles out.

I've done some 2-part rubber silicone resin moulding for military
encapsulation-
pretty well the only well we could get the bubbles out was to cycle vacuum
in a bell jar and purge ..took half a dozen cycles to get a reasonable
smooth finish..

you using an anginate mould? I was thinking perhaps wax or plaster might
be more tolerance accurate... the mould is the issue  - it's hard to get
the 'axle' bits without make two half moulds and filling them, unless one
goes with a one piece mold and metal pin axle.
>