I am cross posting this from another group. I'm sure that answers
will come from orchid. You can send directly to Mike or just post as
usual and I'll send them on to the group,artmetal.
I know there are a few of you who have fairly extensive bronze
casting experience and I hope someone can help us out with
some info. We have been using 2 casters for our product...one
has been handling our gold and silver, the other recently
started casting our pieces in bronze. We have had excellent
service and consistently high quality from our gold/silver
caster. The caster who has picked up our bronze work, however,
has sent us a high percentage of pieces with extensive
porosity and isvery reluctantto consider that the porosity may
be due to something other than the waxes we send and the way
they have been sprued. We have been successfullycasting these
same waxes with the same spruing for over five years with
several different casters so we're fairly confident that we
have things reasonably nailed down on our end.
Anyway, the caster who has been handling our gold/silver is
on us and is going to "lower" himself, risk his hard-earned
as a precious metals caster and take a crack at our bronze. He
has never cast bronze before and asked me if I could help him
do a little homework. We have been casting Everdur (silicon)
bronze. Specific questions:
1) What is the recommended temp. at melt?
2) Recommended flask temp.?
3) What percentage (if any) new casting grain addition when
We are talking about small, jewelry size pieces (mostly flat,
5/8"-13/4" oval/round pieces) and using a vacume casting
system. Any help or pointers would really be appreciated and if
someone with experience casting small bronze items would be
willing to talk to him on the phone even better. He's not a
rookie at this, just wants to know
as much as possible before jumping in with both feet!
Thanks in advance,
Black Horse Design