On Sat, 01 Nov 2008 06:44:40 -0700, Larry Jaques wrote:

On Sat, 01 Nov 2008 01:23:16 -0500, the infamous Tim Wescott
scrawled the following:

On Fri, 31 Oct 2008 22:59:53 -0600, F. George McDuffee wrote:

On Fri, 31 Oct 2008 21:38:22 -0700 (PDT), Dar
wrote:

I need to make a bunch of molds in sandcast bronze and would like to
know the kind of sand
to get for finest detail/smoothest finish . They won't be complex , or
even 2 part sand molds, probably just bronze poured onto a flat cope
that has an depression in it and a dam built around the depression .

thanks

DS
I would consider plaster molds for best detail

see
http://www.modernsculpture.com/bronze.htm

I've only ever used plaster molds (a long time ago, molding bullets for
miniature cannon out of solder. It's a wonder I'm still alive).

Were they still wet and exploded on you? There's a very good reason the
molds are seasoned in the furnace, Tim, as you found out.

Some were. Fortunately a 1-inch square bit of plaster doesn't do much
damage.

A quarter-ounce of solder ejecting straight up from the mold can be
exciting, though.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html