open mold brass casting

[savarin]

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.

 

[vtcnc]

Yes! Casting Brass on Youtube

 

[benmychree]

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]

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]

What happened with the foam?

 

[savarin]

Have a look here
https://www.hobby-machinist.com/threads/80mm-long-focal-length-refractor.26212/page-2 message 43
It could be called a success I suppose but I didnt really like the result although it did clean up sufficiently to use.

 

[Cooter Brown]

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

 

[genec]

an uptodate yellow boy

 

[savarin]

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

 

[savarin]

I have done a lot of brass and bronze casting, brass is easy, bronze not so easy to achieve clean sound castings.

What are the main problems with bronze?