5497Re: Cast Iron
- Aug 7, 2001Wouldn't 101% of 10.00 inches be 10.10 inches? and not 10.01 (10,01)?
--- In hobbicast@y..., Stefan_Pfaff@w... wrote:
> for shrinkage on cast iron you have to allow 1%, for cast steel
> 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
> > shrinkage.
> > 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
> > and design some patterns. Draft is no problem if I scale the
> > 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
> > retired is a lot of work, but it's fun, no Boss watching over my
> > sholder.
> > Marvin
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