X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <ceengland@bellsouth.net>
Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified)
  by logan.com (CommuniGate Pro SMTP 4.3.2)
  with ESMTP id 968243 for flyrotary@lancaironline.net; Mon, 30 May 2005 17:56:40 -0400
Received-SPF: pass
 receiver=logan.com; client-ip=205.152.59.65; envelope-from=ceengland@bellsouth.net
Received: from ibm57aec.bellsouth.net ([209.215.61.226])
          by imf17aec.mail.bellsouth.net with ESMTP
          id <20050530215556.DTDP5832.imf17aec.mail.bellsouth.net@ibm57aec.bellsouth.net>
          for <flyrotary@lancaironline.net>;
          Mon, 30 May 2005 17:55:56 -0400
Received: from [209.215.61.226] by ibm57aec.bellsouth.net with ESMTP
          id <20050530215555.MRSL25470.ibm57aec.bellsouth.net@[209.215.61.226]>
          for <flyrotary@lancaironline.net>;
          Mon, 30 May 2005 17:55:55 -0400
Message-ID: <429B8BF3.5040001@bellsouth.net>
Date: Mon, 30 May 2005 16:56:03 -0500
From: Charlie England <ceengland@bellsouth.net>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: D-sub connectors - Prewired cables
References: <list-965041@logan.com>
In-Reply-To: <list-965041@logan.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Al Gietzen wrote:

>Please tell me that when you said 'acid' you really meant 'acid free 
>flux for electronic wiring '.
>
>What kind of wire won't take solder well?
>
>Charlie
>
>
>No, I actually meant a weak muriatic acid solution.  Chromel-alumel K-type,
>and Iron-constantan J type.  I was using a acid free flux core solder which
>would not do the job.  I rinsed with distilled water after soldering to
>remove any residual.  I think it was the K type that were the worst.
>
>I had considered a crimped joint transitioning to tinned copper before the
>solder joint; but then I'd have TWO dissimilar metal junctions and further
>error.   Seemed best to solder directly to the pins as best I could.  .
>What have others done with EGT thermocouples to the EM2?
>
>When I re-do it when it doesn't work anymore, I'll get the gold plated d-sub
>pins and a new connector.
>
>Al
>

Sorry 'bout that; I realized what 'TC' referred to after hitting <send>. 
If there are electronic newbies here it's worth pointing out that this 
is a very special case & acid flux normally has no place around 
electrical/electronic soldering.

Charlie