X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 10 Jul 2010 21:01:11 -0400 Message-ID: X-Original-Return-Path: Received: from vms173015pub.verizon.net ([206.46.173.15] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4386819 for lml@lancaironline.net; Fri, 09 Jul 2010 13:11:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.15; envelope-from=lancair403@verizon.net Received: from personalab15f4 ([unknown] [72.84.67.83]) by vms173015.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0L5A004F6VP3SJ10@vms173015.mailsrvcs.net> for lml@lancaironline.net; Fri, 09 Jul 2010 12:10:16 -0500 (CDT) X-Original-Message-id: From: "William Rumburg" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Close Tolerance Bolts X-Original-Date: Fri, 09 Jul 2010 13:10:15 -0400 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_0045_01CB1F68.12699400" X-Priority: 3 X-MSMail-priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 This is a multi-part message in MIME format. ------=_NextPart_000_0045_01CB1F68.12699400 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Scott- While close tolerance bolts are not really justified for most = applications, they are for the landing gear. It's nice to slip one in = place and feel the difference! There's almost no free-play in my = ailerons and elevator, but I intend to try them in the flap system.=20 The current spec is NAS 6203 thru 6220, where the last two digits = represent the bolt diameter in 1/16 th's. I purchased mine from Genuine = Aircraft Hardware about five years ago and don't believe I spent more = than $100. to replace the bolts listed below; however, I just checked = current prices and they're about double what I recall, so carefully = determine your required length before ordering (the NAS 6205-42 for the = lower gear leg's are currently $ 22.27 each). The larger diameter ones = are available individually, but smaller ones are only available in = packages of 5, 10 or 25.=20 Bill Rumburg N403WR (Sonic bOOm) Bill, Great information. Considering the number of linkages in the elevator = and aileron push rod systems, perhaps such bolts would reduce the lash = there also. Grayhawk In a message dated 7/8/2010 5:25:48 A.M. Central Daylight Time, = lancair403@verizon.net writes: Since building my 320, I'd noticed the free-play in the main gear = while on the jackstand. Not an excessive amount, but enough to bother = me. Most of it originated at the lower gear leg attachment, but there = was also some at the overcenter link attachment to the gear leg. I = decided to see if that free-play would be appreciably reduced by the use = of close tolerance bolts - it was. They eliminated about 80% of the = free-play at each lower gear leg attachment and almost 100% at the = overcenter link attachment (there was also a slight amount in the rod = end bearing itself. I wasn't impressed with the quality of the one = supplied with the kit and replaced it with a Heim HME-6 which had = virtually no free-play). I also installed close tolerance bolts at the = upper and lower shock attachments and at the overcenter link pivot. I had almost no free play at the nose gear overcenter link = attachment, but installed a close tolerance bolt there also and it only = improved the condition. Aircraft Spruce does not stock many close tolerance bolts, I = purchased mine from Genuine Aircraft Hardware, which has all sizes and = lengths. I think they are a great thing and might install them = throughout the airframe in the future. Bill Rumburg N403WR (Sonic bOOm) ------=_NextPart_000_0045_01CB1F68.12699400 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Scott-
 
While close tolerance bolts = are not really justified for most applications, they are for = the=20 landing gear. It's nice to slip one in place and feel the = difference!=20 There's almost no = free-play in my=20 ailerons and elevator, but I intend to try them in the=20 flap system. 
The current spec is NAS = 6203 thru 6220,=20 where the last two digits represent the bolt diameter in 1/16 th's. I = purchased=20 mine  from Genuine Aircraft Hardware about five years ago and don't = believe=20 I spent more than $100. to replace the bolts listed below; however, = I just=20 checked current prices and they're about double what I recall, = so=20 carefully determine your required length before ordering (the NAS = 6205-42 for=20 the lower gear leg's are currently $ 22.27 each). The larger diameter ones are=20 available individually, but smaller ones are only available in = packages of 5, 10 or 25. 
 
Bill Rumburg
N403WR (Sonic = bOOm)
Bill,
 
Great information.  Considering the number of linkages in = the=20 elevator and aileron push rod systems, perhaps such bolts would reduce = the=20 lash there also.
 
Grayhawk
 
In a message dated 7/8/2010 5:25:48 A.M. Central Daylight Time, = lancair403@verizon.net = writes:
Since building my 320, = I'd noticed=20 the free-play in the main gear while on the jackstand. Not = an=20 excessive amount, but enough to bother me. Most of it = originated at the lower gear leg attachment, but there was also = some at=20 the overcenter link attachment to the gear leg. I decided to = see=20 if that free-play would be appreciably reduced by the use = of close=20 tolerance bolts - it was. They eliminated about 80% of the = free-play at=20 each lower gear leg attachment and almost 100% at the = overcenter link=20 attachment (there was also a slight amount in the rod end bearing = itself. I=20 wasn't impressed with the quality of the one supplied with the kit = and=20 replaced it with a Heim HME-6 which had virtually no free-play).=20 I also installed = close=20 tolerance bolts at the upper and lower shock attachments and at=20 the overcenter link pivot.
I had almost no free = play at the=20 nose gear overcenter link attachment, but installed a close = tolerance bolt=20 there also and it only improved the condition.
Aircraft Spruce does = not stock many=20 close tolerance bolts, I purchased mine from Genuine Aircraft = Hardware,=20 which has all sizes and lengths. I think they are a great thing and = might=20 install them throughout the airframe in the future.
 
Bill = Rumburg
N403WR (Sonic = bOOm)
 

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