X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Sep 2005 14:09:03 -0400 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 726591 for lml@lancaironline.net; Mon, 19 Sep 2005 13:20:49 -0400 Received-SPF: none receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@baesystems.com Received: from mnexch01.MSGDOMAIN.MPLS.UDLP.COM ([10.1.62.20]) by mta-out-1.udlp.com (8.12.10/8.12.10) with ESMTP id j8JHD0bk022934 for ; Mon, 19 Sep 2005 12:13:00 -0500 Received: from asdmngwia.udlp.com ([10.1.62.22] RDNS failed) by mnexch01.MSGDOMAIN.MPLS.UDLP.COM with Microsoft SMTPSVC(6.0.3790.211); Mon, 19 Sep 2005 12:16:39 -0500 Received: from DM-MN-06-MTA by asdmngwia.udlp.com with Novell_GroupWise; Mon, 19 Sep 2005 12:19:53 -0500 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.5.4 X-Original-Date: Mon, 19 Sep 2005 12:20:44 -0500 From: "Christopher Zavatson" X-Original-To: Subject: LNC2 elevator hinges Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-OriginalArrivalTime: 19 Sep 2005 17:16:39.0254 (UTC) FILETIME=[E5983760:01C5BD3D] This topic has had a fairly short cycle time on the LML, re-emerging = relatively often. I follow these threads with interest since I tinkered = with the hinge issue a couple of years ago. The result is an all metal = solution that eliminates play far better than anything I have seen thus = far. Wear has not been measurable yet, but I only have a few years and = couple hundred hours on the parts. The details are online at: http://www.= n91cz.com/HingePlay/hinges.htm =20 In short, a standard MS hinge is reamed (hand reamer from McMaster) and = then a larger diameter pin is used (SS welding rod). General conclusions: 1.The standard MS hinge extrusion has a huge allowable tolerance for the = hole diameter (.005"). Without modification, there is no single pin or = insert that will both fit all hinges and not have play. http://www.n91cz.com/HingePlay/hinge_spec_1.jpg http://www.n91cz.com/HingePlay/hinge_spec_2.jpg 2.The MS pin is undersized which adds to the tolerance in 1.=20 http://www.n91cz.com/HingePlay/pin_spec.jpg=20 2.Wear can be controlled by contolling the pin/hinge tolerance and = clearance. 3.Plastics such as Teflon and Nylon are very soft and will flow and deform = if subjected to high loads. =20 http://www.n91cz.com/HingePlay/sleeve-web.JPG=20 How much play is acceptable is very difficult to quantitfy. Certainly = less is better, in particular for non-mass balanced surfaces such as large = trim tabs. The following video clip compares the play of various hinge options. http://www.n91cz.com/HingePlay/Hinge_Play_Test-low_res.WMV Chris Zavatson N91CZ 360std www.N91CZ.com