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Message-ID: <1ab24f410809121654i1f9b6f23pc8ff72d512f4216b@mail.gmail.com>
Date: Fri, 12 Sep 2008 16:54:07 -0700
From: "Lynn Hanover" <lehanover@gmail.com>
To: flyrotary@lancaironline.net
Subject: Cracks
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Gents,

This is the first time I have looked at the inside of a front cover.  Are
these "cracks" normal?  Or did my part get stressed somewhere along the line
and now I need a new cover?

Chris


Those are called foldovers and oclutions, and are typical of permanent mold
aluminum injection molding. The mold temperature may have been a bit low for
this shot, and subsequent shots would have had fewer such imperfections.
Ultrasound inspection would reveal any actual discontinuities.

Lynn E. Hanover

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<div dir="ltr"><div>Gents,<br><br>This is the first time I have looked at the inside of a front cover.&nbsp; Are<br>these &quot;cracks&quot; normal?&nbsp; Or did my part get stressed somewhere along the line<br>and now I need a new cover?<br>
<br>Chris<br>&nbsp;</div>
<div>&nbsp;</div>
<div>Those are called foldovers and oclutions, and are typical of permanent mold aluminum injection molding. The mold temperature may have been a bit low for this shot, and subsequent shots would have had fewer such imperfections. Ultrasound inspection would reveal any actual discontinuities.</div>

<div>&nbsp;</div>
<div>Lynn E. Hanover</div></div>

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