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open mold brass casting

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savarin

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#1
Can I pour brass into an open mold?
I need 2 brass blocks approximately 1.25 x 3 x 4 inches.
They will be machined square after.
 

benmychree

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#3
All too many people use the term "brass" entirely too loosely; if it is an alloy of copper and zinc, probably yes; if it has tin in it, the answer is likely no. Tin oxidises in the presence of air and makes a nasty casting, a two part mold reduces the tendency to a very minimal effect; I have not looked at you tube posts, but generally, they do not know their a-- from a bucket of hot rocks. I have done a lot of brass and bronze casting, brass is easy, bronze not so easy to achieve clean sound castings.
 

savarin

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#4
I am assuming its brass scrap not bronze due to its colour.
I hoped an open mold would work but was unsure.
I think I will gate them as usual.
My lost foam cast was horrendous.
 

benmychree

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#5
What happened with the foam?
 

Cooter Brown

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#7
this guy does an open pour with Brass.....
 

genec

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#8
an uptodate yellow boy
 

savarin

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#9
thanks, excellent video.
A few defects that I'm hoping to avoid.
 
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