X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 965040 for flyrotary@lancaironline.net; Fri, 27 May 2005 02:26:25 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao10.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050527062536.NLVM20235.fed1rmmtao10.cox.net@BigAl> for ; Fri, 27 May 2005 02:25:36 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: D-sub connectors - Prewired cables Date: Thu, 26 May 2005 23:25:39 -0700 Message-ID: <000001c56284$e68a5e00$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Please tell me that when you said 'acid' you really meant 'acid free=20 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