John, this is not a good thing to do. First of all, propane doesn’t
burn as hot as acetylene; when jewelers use propane, it’s an
oxy/propane torch not propane/air. Second, you will need a new hose -
once committed to one fuel gas, you can’t switch to a different one
without damage to the hose. Third is the issue of the tip, and I’ll
bet if it’s done wrong it becomes an usafe situation.
When you say you ‘have’ propane, do you mean the studio has propane
piped into it, or you just have a propane tank? Is it a barbeque
grill tank, or one specifically made for indoor use by jewelers?
There is a huge difference, and it’s a safety issue.
If the propane you already have is an oxy/propane setup, then use
that for melting your ingots, it gives much more heat than just the
propane/air. Maybe you just need a rosebud tip for your Little
I would recommend that you avoid the safety compromise and
frustration involved in converting an acetylene torch to a propane
torch, and just get an acetylene tank. It’s not such a large expense,
and the system will serve you well for a long time.