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From: arf@ddsw1.MCS.COM (Jack Schmidling)
Newsgroups: trial.rec.metalworking
Subject: Foundry Problems
Message-ID: <1991May06.152219.16752@ddsw1.MCS.COM>
Date: 6 May 91 15:22:19 GMT
Distribution: trial
Organization: ddsw1.MCS.COM Contributor, Wheeling, IL
Lines: 29


                     Foundry Problems
 
 This is more of a test then a quest for info.  I don't quite 
 know what trial means nor where this will end up.
 
 ...............
 
 I have a basement foundry and am having problems with switching from
 aluminum to brass or silver.
 
 A pattern that works well in aluminum will have voids when 
 cast in brass or silver.  The current example is a small 
 bell (3 in high).  I get voids when cast in silver or brass 
 but a perfect bell in aluminum.
 
 I have the same problem with a small saucer but none with a 
 similar condiment bowl that is about twice as thick.
 
 It would appear that the metal is not hot enough but my 2200 
 deg pyrometer is pegged when I pour.
 
 Any founders out there?
 
 arf
 

ps  p.s.  If response by email.... please send to arf@gagme.chi.il.us
arf