X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 10 Jul 2010 21:01:12 -0400 Message-ID: X-Original-Return-Path: Received: from web36902.mail.mud.yahoo.com ([209.191.85.70] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with SMTP id 4386045 for lml@lancaironline.net; Thu, 08 Jul 2010 21:37:56 -0400 Received-SPF: none receiver=logan.com; client-ip=209.191.85.70; envelope-from=chris_zavatson@yahoo.com Received: (qmail 47644 invoked by uid 60001); 9 Jul 2010 01:37:20 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=ju99VxpXplFNy3x6O9qkjWcZ20x2GUWMNJgOXZdG00M6dmUUjcsamxJm1TKrnJWvIzJJDXxDCctEUp4ET6ZBDDzYuEZqc6T6S1B4LcWYaUoW7RVP3eXxynRiOIn3zzcou5cryARWdEl8gtZjP0NBqZsvO7e3rwvJbf9qwIqkJW8=; X-Original-Message-ID: <132731.47638.qm@web36902.mail.mud.yahoo.com> X-YMail-OSG: xfQ2VZYVM1mrkwGKxXWL33Q4CzDODzFPY87BKVz.6PtFkrD d_7UTImYGC3M9vy6dacg8.9SyVPRRRY46H17v97M5p5rlCG59OCMnQVBz3vs a6NFXxQxlmOG5BAwwVlbFWZ3L0rJZuZhOEhQLb5IGyq1iEI0xWQ99ODy7t4R 9VaVUChcZSKOtWV5bGpn3IhTowVIAl6mVFHgBiEIqQAUvXSAVQoTRN.8SEA_ 9SB7rKpzZeI.bsLxtD.B1LNa3J2SrbU9YqG16zm5zvm49.yaONWKUB4J69Wx RM9jxf1vYzXsVLsEHucikhOdxafKnfT.9r04MafkuXdlWJUo5p3AdamTGBWZ dd6iIlixsWdOfdEUpgwGf80ese3jm8xp9eP2B8Q-- Received: from [149.32.224.33] by web36902.mail.mud.yahoo.com via HTTP; Thu, 08 Jul 2010 18:37:19 PDT X-Mailer: YahooMailRC/420.4 YahooMailWebService/0.8.104.274457 References: X-Original-Date: Thu, 8 Jul 2010 18:37:19 -0700 (PDT) From: Chris Zavatson Subject: Re: [LML] Re: Close Tolerance Bolts X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-73995926-1278639439=:47638" --0-73995926-1278639439=:47638 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Scott, Bill, et al,=0ASome numbers.=0A=A0The tolerance difference between s= tandard AN bolts and close tolerance bolts is =0Adramatic.=A0 For AN4 bolts= , the diameter range is .246-.249" or up to .004" play =0Ain a nominal 1/4"= hole.=A0 For=A0the close tolerance version the diameter=A0range =0Ais=A0.2= 487-.2492", the maximum play is .0013" in a nominal 1/4" hole.=A0=A0Slop = =0Areduced by 70%.=A0 =0A=0AReduced play translates into better load distri= bution and reduced wear in all =0Athe pivot joints.=A0 I switched to close = tolerance bolts for all over center link =0Ajoints=A0in the first year of f= lying.=A0 =A01,100 hours later the only signs of wear =0Ais on the anodizin= g of the parts.=0AI highly recommend the switch.=0A=0A=0AChris Zavatson=0AN= 91CZ=0Aclose tolerance 360std=0Awww.N91CZ.com=0A=0A=0A=0A__________________= ______________=0AFrom: "Sky2high@aol.com" =0ATo: lml@lanc= aironline.net=0ASent: Thu, July 8, 2010 3:47:13 PM=0ASubject: [LML] Re: Clo= se Tolerance Bolts=0A=0ABill,=0A=0AGreat information.=A0 Considering the nu= mber of linkages in the elevator and =0Aaileron push rod systems, perhaps s= uch bolts would reduce the lash there also.=0A=0AGrayhawk=0A=0AIn a message= dated 7/8/2010 5:25:48 A.M. Central Daylight Time, =0Alancair403@verizon.n= et writes:=0ASince building my 320, I'd noticed the free-play in=A0the main= gear=A0while on the =0Ajackstand. Not an excessive amount, but=A0enough to= =A0bother me. Most of=A0it =0Aoriginated at the lower gear leg attachment, = but=A0there was also some at the =0Aovercenter link attachment to the gear = leg.=A0I decided to see if=A0that free-play =0Awould be appreciably reduced= by=A0the use of close tolerance bolts - it was. =0AThey=A0eliminated about= 80% of the free-play=A0at each lower gear leg attachment =0Aand=A0almost 1= 00% at the overcenter link attachment (there was also a slight =0Aamount in= the rod end bearing itself. I wasn't impressed with the quality of the =0A= one supplied with the kit and replaced it with a Heim HME-6 which had virtu= ally =0Ano free-play). I=A0also installed close tolerance bolts at the uppe= r and lower =0Ashock attachments and at the=A0overcenter link pivot.=0A>I h= ad almost no free play at the nose gear overcenter link attachment, but =0A= >installed a close tolerance bolt there also and it only improved the condi= tion.=0A>Aircraft Spruce does not stock many close tolerance bolts, I purch= ased mine=A0from =0A>Genuine Aircraft Hardware, which has all sizes and len= gths. I think they are a =0A>great thing and might install them throughout = the airframe in the future.=0A>=A0=0A>Bill Rumburg=0A>N403WR (Sonic bOOm)= =0A>=A0=0A=0A=0A --0-73995926-1278639439=:47638 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Scott, Bill, et al,
=0A
Some numbers.
=0A
 = ;The tolerance difference between standard AN bolts and close tolerance bol= ts is dramatic.  For AN4 bolts, the diameter range is .246-.249" or up= to .004" play in a nominal 1/4" hole.  For the close tolerance v= ersion the diameter range is .2487-.2492", the maximum play is .0= 013" in a nominal 1/4" hole.  Slop reduced by 70%. 
= =0A
Reduced play translates into better load distribution and reduced w= ear in all the pivot joints.  I switched to close tolerance bolts for = all over center link joints in the first year of flying.   1= ,100 hours later the only signs of wear is on the anodizing of the parts.=0A
I highly recommend the switch.
=0A
 
=0A 
=0A
Chris Zavatson
=0A
N91CZ
=0A
close t= olerance 360std
www.N91CZ.com=0A

=0A
=0A
=0AFrom: "Sky2high@aol.com" <Sky2h= igh@aol.com>
To: lml@= lancaironline.net
Sent: = Thu, July 8, 2010 3:47:13 PM
Subjec= t: [LML] Re: Close Tolerance Bolts

=0A
Bill,
=0A
=  
=0A
Great information.  Considering the number of link= ages in the elevator and aileron push rod systems, perhaps such bolts would= reduce the lash there also.
=0A
 
=0A
Grayhawk=0A
 
=0A
=0A
In a message dated 7/8/2010 5:25:48 A.= M. Central Daylight Time, lancair403@verizon.net writes:
=0A=0A
Since building m= y 320, I'd noticed the free-play in the main gear while on the ja= ckstand. Not an excessive amount, but enough to bother me. Most o= f it originated at the lower gear leg attachment, but there was a= lso 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. TheyI also installed close tolerance bolts at the up= per and lower shock attachments and at the overcenter link pivot.
=0A
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.
=0A
Aircraft Spruce does not stock many close tolera= nce bolts, I purchased mine from Genuine Aircraft Hardware, which has = all sizes and lengths. I think they are a great thing and might install the= m throughout the airframe in the future.
=0A
 
=0A
Bill Rumburg
=0A
N403WR (Sonic bOOm)
=0A
 

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