Return-Path: <lancair.list-request@olsusa.com>
Received: from pop3.olsusa.com ([63.150.212.2] verified)
  by logan.com (CommuniGate Pro SMTP 3.4.7)
  with ESMTP id 799342 for rob@logan.com; Thu, 14 Jun 2001 10:41:22 -0400
Received: from pimout2-int.prodigy.net ([207.115.63.101])
          by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223
          ID# 0-71175U5500L550S0V35) with ESMTP id com
          for <lancair.list@olsusa.com>; Thu, 14 Jun 2001 09:45:26 -0400
Received: from bill (A010-0047.PANG.splitrock.net [64.199.226.47])
	by pimout2-int.prodigy.net (8.11.0/8.11.0) with SMTP id f5EDrLV140832
	for <lancair.list@olsusa.com>; Thu, 14 Jun 2001 09:53:22 -0400
Message-ID: <000801c0f4d9$8c9f3ae0$2fe2c740@bill>
From: "William T Bartlett" <WTBARTLETT@prodigy.net>
To: <lancair.list@olsusa.com>
References: <20010614055407.AAA4936@pop3.olsusa.com>
Subject: Re: Powder Coating Aluminum
Date: Thu, 14 Jun 2001 06:53:51 -0700
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Mailing-List: lancair.list@olsusa.com
Reply-To: lancair.list@olsusa.com

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
The heat treatment of steel and aluminum is almost the opposite. Steel is
heated to a high and some temp. then rapidly cooled, which makes it very
hard. Steel is then heat soaked at a relatively high temperature (tempered)
which softens it to the desired temperature. Aluminum alloys are heated
to a high, but much lower temperature and cooled rapidly, which makes them
soft and the heat treateable ones are heat soaked at a relatively low temp.
(100 - 160 c) which hardens them. There is a somewhat abreviated explanation
in the AS catalog.

That gear leg is probably made of 7075 whith a bunch of letters after it. I
wouldn't heat the gear legs to 400 F for 20 min. without asking the
manufactuer, who did the original heat treatment.

Bill N7WB


[Bill, the gear legs are made of 4130 steel, not 7075 AL.     <Marv>   ]

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>