Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 05 Jan 2005 01:05:54 -0500 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 591871 for lml@lancaironline.net; Tue, 04 Jan 2005 23:17:58 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@udlp.com Received: from asdmngwia.mpls.udlp.com (asdmngwia.mpls.udlp.com [10.1.62.22]) by mta-out-1.udlp.com (8.12.10/8.12.10) with ESMTP id j052Gsu2030665 for ; Tue, 4 Jan 2005 20:16:54 -0600 Received: from DM-MN-06-MTA by asdmngwia.mpls.udlp.com with Novell_GroupWise; Tue, 04 Jan 2005 22:17:22 -0600 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.0.2 X-Original-Date: Tue, 04 Jan 2005 22:17:17 -0600 From: "Christopher Zavatson" X-Original-To: Subject: [LML] Re: 235 Near miss Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline Scott, I got the reamer from McMaster. They are available in increments of 0.0005 ". Being that small of a diameter, it is very short. I ground down the end so I could press/pinch on a long piece of SS tubing (I didn't buy the one I had - I would check McMaster for tubing). Reaming is done slowly and by hand. Most of what the reamer takes off is a lip or burr formed at the ends of each hinge segment. Tolerances of the MS hinge will vary, but most fall on the large side. Unfortunately this diminishes the benefit. I would love to find one on small side to ream even more of the hinge surface, ideally all of it. The welding wire is held to a very close tolerance . I don't know why but I'm glad it is. (-can be purchased in 1 and 5 lb packs of about 36" long pieces at your local welding supply store) In your hands, the hinge will feel stiffer than the original. Most new hinge material tends to have some curl to it. It frees up nicely once screwed down to a flat surface. Note that if your hinge surfaces are not flat, you will add friction to the system. I have not experimented with other tolerance combinations/reamer sizes. If one could find a source for slightly larger wire, just above the maximum range of MS hinge (0.098"), a uniform ID over the full length could be guaranteed. Even with luck-of-the-draw MS hinge material the results have been excellent. If you go tug on my aileron, for example, you will not see any relative movement between the hinge halves -in the air, no more bouncing ailerons. That bouncing was the primary source of wear on the original MS hinge. As measurement showed, all the wear was vertical. I lube them with LPS2 once a year. Marv's potential source for a super long reamer is worth investigating. My longest hinge is in the elevator trim tab (MKII). I had to attack it from both ends. Good luck! Chris