[modeleng] Re: Another one bites the dust

Harry,

I saw some photos of the baked moulds that Stuart used somewhere and they
were quite thin.  They depended on the linseed oil (or whatever they used as
a binder) to hold the thin walls together until the metal had cooled.  If
they performed anything like the Thermite rail welding moulds Terry and I
used, they would pretty well disintegrate soon after the metal was cool
enough to hold its shape.  (That was steel and not cast iron so it was
prolly hotter) I am sure that vapours could pass easily through the moulds
just as it does with baked cores, some of which have through holes in them
for venting.  All I have to say is that the process made the most beautimus
castings I have ever worked with.

Jesse in Ten-o-see (same colony that Harry lives in)

>        I understood the molds (old) Stuart used were porous and allowed
> gasses to escape from almost anywhere in the mold and eliminatedventing,
> blowholes, and sand inclusions.  But for decades Stuarts was THE place for
> model engineers to send one-off patterns for castings, which they would
> have done in green-sand molds, and I never read a report that mentioned a
> bad casting, only superb ones that cut like cheese.
>

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