Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5b3) with ESMTP id 840057 for rob@logan.com; Thu, 26 Jul 2001 08:11:58 -0400 Received: from falcon.mail.pas.earthlink.net ([207.217.120.74]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Wed, 25 Jul 2001 21:54:50 -0400 Received: from walter (pool0387.cvx38-bradley.dialup.earthlink.net [216.244.31.132]) by falcon.mail.pas.earthlink.net (EL-8_9_3_3/8.9.3) with SMTP id TAA25699 for ; Wed, 25 Jul 2001 19:04:16 -0700 (PDT) Message-ID: <001301c11578$1cfa2960$841ff4d8@walter> From: "Walter Dodson" To: "LancairList" Subject: Aluminum heat treat w/o oven & specs Date: Wed, 25 Jul 2001 18:35:16 -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 >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Chris, Please don't try to heat treat your tubes at home. Firstly, you don't have the proper procedural specs and secondly, your oven isn't quite up to the 900 degree task. Do you have a quenching tank? What will you use for the cool down cycle... your wrist watch and a good guess? I was the back shop inspector at Santa Barbara Aerospace in the years '97-'98 and I found the aluminum heat treat process complex, to say the least. As a newbie, I defered to the more experienced inspectors when a judgement call was required. We had printed tape readouts of all our ovens' temps/times and that let us double check the process. Those records are part of any repair done on a transport airplane. 5052-0 Al is only one of many types of Al you might encounter. Be sure to find the proper spec. The flame/smoke/oxyclean method isn't up to today's technology. Furthermore, a properly made flare should need no annealing. The work hardening done in the process is expected and is not detrimental to the final piece. If it were, AC 43.13 would have a follow up instruction. Good tube making is an art and homebuilders need to practise in order to become proficent. Nice workmanship will pay back the builder down the road with fewer leaks and problems; the worst of which might be a stuck gear! Thanks, Walter Dodson IV-P 60% >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>