Message-ID: <001301c1117b$9a4446e0$a0ca0041@mshome.net>
From: "Robert Smiley" <robsmiley@home.com>
To: <lancair.list@olsusa.com>
References: <000d01c11136$ebe5d9e0$c9aab2d1@walter>
Subject: Re: Hydraulics
Date: Fri, 20 Jul 2001 18:25:10 -0600
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>>
Concerning flaring and failing hydraulic lines.  I read in the Mil Specs
that all tubing should be annealed after working.  I did such an exercise on
all my aluminum lines, both fuel and hydraulic.  The method is to use an
acetyline torch.  Adjust the torch for a sooty smoke flame, cover the tubing
with soot.  This sets the stage for annealing.  Then adjust the torch for a
mild low temperature flame and smoothly work the flame over the tubing with
just enough heat and time to clear up the soot on the tubing.  You must be
careful not to stay too long in a single spot else half your tubing will
suddenly drop to the floor and splatter. It is not necessary to get every
last bit of soot burned off.  The objective here is to relieve stress.  You
only need to work the areas that were bent and/or flaired.  It will take
practice and you may melt a couple lines.  I did but I can truthfully say
that all internal stresses and work hardened related problems have been
eliminated.

Bob Smiley
N94RJ

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