If you have a piece that is uniformly chunky, a casting should
theoretically be fine. If you have a piece that is chunky here, thin
there, then you will come up against possible casting issues.
If you are sending your work out to a reliable casting house, then
it’s their problem. You shouldn’t fear though, good casting houses
know what they’re doing, and will cast jobs with uneven metal
distribution with other jobs to reduce or eliminate casting defects.
The problem with an uneven chunky casting is that the thinner
sections of the piece will cool faster than the thicker sections, and
this is where casting defects happen easily in the home shop.
There’s a couple of tricks to avoid this in the home shop. Make
multiple items and invest them in opposite directions. This evens
out the heat on the piece.
Another way is to incorporate thick vents and risers where the
pieces are thin, however you are left with thick vents and risers
that just as easily could have been jewellery.
Regards Charles A.