<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 5.50.4134.600" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#000080></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=tune4@earthlink.net = href="mailto:tune4@earthlink.net">Paul Chick (EarthLink)</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> August 27, 2002 7:14 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Foundry = Castings</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Alan</FONT></DIV> <DIV><FONT face=Arial size=2>Brittle cast was for low stress, low = cost castings.  I'm sorry I can't relate any specific formulas.    Some cast machined very well, while other = parts were a head ache.  </FONT></DIV></BLOCKQUOTE> <DIV dir=ltr><FONT color=#000080>The brittle cast was probably gray = iron--lots of carbon. That is why gray iron machines easily. It is also why it = breaks so readily.</FONT></DIV> <DIV dir=ltr><FONT color=#000080></FONT> </DIV> <DIV dir=ltr>Del</DIV></BODY></HTML>