5496Re: Cast Iron
- Aug 7, 2001Hi,
for shrinkage on cast iron you have to allow 1%, for cast steel you
need 2%, for aluminum 1,25% and for bronce 1,5%.
for example: for a part 10,00 inches long in cast iron you need to
make a pattern 10,01 inches long.
Greetings from the southern but not so hot part of germany
--- In hobbicast@y..., "Marvin" <mz1773@h...> wrote:
> How much should I allow for shrinkage on cast iron parts? I have
> cast some aluminum but nothing important so I never worry about
> But now I am designing patterns for all the cast parts for a 3/8"
> scale Waterloo Boy tractor and shrinkage is important.
> I have been trying to build a home hobby machine shop but the
> is just too hot to work outside for long so I have been playing
> a QuickCad program trying to learn how to do drafting on my puter
> and design some patterns. Draft is no problem if I scale the parts
> down correctically as they already have plenty of draft.
> If it ever cools down and I get the shop finished I will build my
> fired foundry and try some cast iorn casting.
> I am finding that having fun and trying to keep busy now that I am
> retired is a lot of work, but it's fun, no Boss watching over my
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