[modeleng] Re: Casting Questions
- From: Doug Edwards <stueart@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 06 May 2005 08:32:59 -0700
Charles,
I pour bronze on occasion at 1950f, and started doing so on concrete. I
later read
this was not recommended, but I have never had the concrete pop. The
conditions
I was in was on old concrete in the middle of summer in a dry climate,
which may
have had something to do with it.
On the other hand, I have never seen a commercial investment foundry that
didn't pour over cement, and that included ferrous alloys closer to 3000F.
All I can say is draw your own conclusions. By my experiences, I sure
don't
know.
Regards,
Doug
Charles & Dorothy Brumbelow wrote:
>First -
>
>All "the books" say one should not set up to melt and pour aluminum or other
>high melting temperature metals on a concrete floor, because when (not if)
>there is a spill the moisture within the concrete will turn to steam with
>explosive force, sending shrapnel flying.
>
>A sand working area is recommended.
>
>What happens if the sand is damp and molten metal is spilled on it?
>
>Second -
>
>When the mold ready for pouring is being moved from the bench where it was
>rammed up to the place where the metal will be poured, should it be carried
>on and later set on top of a board to keep the rammed sand from falling out
>or getting collapsed by irregularities in the sand floor? This would be a
>board such as is used when the cope or drag is being flipped for pattern
>removal.
>
>Thanks, Charles
>
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--
Doug Edwards
Stueart@xxxxxxxxx
Building a 70 ton Willamette in 1.6"
http://www.rad45.org/Supplies.htm
Building a 80 ton Climax in 1.6"
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