Can’t see a problem with that. The only issue would be with surface
tension, and only if you’re using an open mould.
What do you mean by surface tension?..and what problems do you
foresee with an open mold?
Metal in a molten state is a liquid, and liquids are subject to
surface tension. If you fill a glass to the brim with water, you can
go a little further due to surface tension, and the water will form a
Metal is no different, when you melt a metal it will form a rounded
shape, until there is more volume to overcome surface tension,then
it flows to a point where surface tension comes back into effect. You
can demonstrate this by pouring pewter onto a firebrick, a small
amount will form balls, the more metal you add the ball will flatten
until it becomes an irregular shape with rounded edges.
When you are casting any metal it is still subject to surface
tension, and with an open mould (a one piece flat mould for example)
the back edges will rounded.
If you want sharp edges all around, then you make a two piece mould
that has a button, or a feeder. This button/feeder applies head
pressure to the casting, forcing the liquid metal into the corners of
your mould, and you will have quite sharp corners.
Of course if you do use a two part mould you will need vents (maybe
risers also) to allow the escape of air within the mould.
This may at first seem complicated, but I can assure you that it’s
not. I can either direct you to places on the web that outline these
processes and techniques, contact a friend in your local area to
help out (we are global… have mad scientist will travel;-) ), or
give you a book list.
Regards Charles A.