X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 15 Oct 2012 07:57:46 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma06.mx.aol.com ([64.12.78.142] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTP id 5811250 for lml@lancaironline.net; Sun, 14 Oct 2012 18:39:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.78.142; envelope-from=Sky2high@aol.com Received: from mtaomg-db06.r1000.mx.aol.com (mtaomg-db06.r1000.mx.aol.com [172.29.51.204]) by imr-ma06.mx.aol.com (8.14.1/8.14.1) with ESMTP id q9EMdHGl015631 for ; Sun, 14 Oct 2012 18:39:17 -0400 Received: from core-mta005a.r1000.mail.aol.com (core-mta005.r1000.mail.aol.com [172.29.234.145]) by mtaomg-db06.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id A9B61E000086 for ; Sun, 14 Oct 2012 18:39:17 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sun, 14 Oct 2012 18:39:17 -0400 (EDT) Subject: Re: [LML] Re: Torque X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_b714.25a2649b.3dac9915_boundary" X-Mailer: AOL 9.7 sub 19 X-Originating-IP: [207.200.122.33] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:449117536:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33cc507b3f157dbc --part1_b714.25a2649b.3dac9915_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Interesting...... The wing bolts are sized for their shear value. See below for a start. Search the internet for more info. _http://www.coastfab.com/images/pdf/torquefastener.pdf_ (http://www.coastfab.com/images/pdf/torquefastener.pdf) Grayhawk In a message dated 10/14/2012 4:47:57 P.M. Central Daylight Time, paulhershorin@bellsouth.net writes: Thanks--I will look into the tork for that bolt, pull the bolts and repla ce them with new one's. Paul --- On Sat, 10/13/12, Dan Schaefer wrote: > From: Dan Schaefer > Subject: [LML] Re: Torque > To: lml@lancaironline.net > Date: Saturday, October 13, 2012, 8:32 AM > Paul, over-torquing even the high > quality (125,000 - 160,000 psi) AN bolts can be as bad as > under-torquing. With enough torque, the bolt shank can be > stretched to failure. If you don't know how much force with > which your main spar bolts were installed, you could - > repeat "could" - be set up for a real problem. Over-torquing > the spar bolts has an additional problem you probably > haven't considered (aside from a catastrophic failure under > load i.e. failure in flight) - should an outboard bolt fail > while it's being installed, I doubt that getting the broken > remainder out of the spar without cutting into the wing-skin > is possible. At least on the LNC2's. > > Use the published dry-thread torque values for which these > fasteners are designed. A good (calibrated) torque wrench is > a small but invaluable investment for an airplane builder if > you really intend to commit aviation in it. > > Regards, > > Dan Schaefer > > > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html > -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --part1_b714.25a2649b.3dac9915_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Interesting......
 
The wing bolts are sized for their shear value.  See below for a= =20 start.  Search the internet for more info.
 
http://www.c= oastfab.com/images/pdf/torquefastener.pdf
 
Grayhawk
 
 
In a message dated 10/14/2012 4:47:57 P.M. Central Daylight Time,=20 paulhershorin@bellsouth.net writes:
= Thanks--I will look into the tork for that bolt, pull the bo= lts and=20 replace them with new one's.
Paul

--- On Sat, 10/13/12, Dan Sch= aefer=20 <dfs155@roadrunner.com> wrote:

> From: Dan Schaefer=20 <dfs155@roadrunner.com>
> Subject: [LML] Re: Torque
> T= o:=20 lml@lancaironline.net
> Date: Saturday, October 13, 2012, 8:32=20 AM
> Paul, over-torquing even the high
> quality (125,000 -= =20 160,000 psi) AN bolts can be as bad as
> under-torquing. With enoug= h=20 torque, the bolt shank can be
> stretched to failure. If you don't = know=20 how much force with
> which your main spar bolts were installed, yo= u=20 could -
> repeat "could" - be set up for a real problem.=20 Over-torquing
> the spar bolts has an additional problem you=20 probably
> haven't considered (aside from a catastrophic failure=20 under
> load i.e. failure in flight) - should an outboard bolt=20 fail
> while it's being installed, I doubt that getting the=20 broken
> remainder out of the spar without cutting into the=20 wing-skin
> is possible. At least on the LNC2's.
>
> U= se=20 the published dry-thread torque values for which these
> fasteners = are=20 designed. A good (calibrated) torque wrench is
> a small but invalu= able=20 investment for an airplane builder if
> you really intend to commit= =20 aviation in it.
>
> Regards,
>
> Dan=20 Schaefer
>
>
> --
> For archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html
>

--For=20 archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html
--part1_b714.25a2649b.3dac9915_boundary--