[modeleng] Re: Casting Questions

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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