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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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 Posted: Wed Sep 08, 2010 8:14 pm Post subject: AN 115 Cable Shackle |
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WHen using an an 115 cable shackle, and torquing to the specified value for an AN 3, it is clamping to my aileron bellcrank and causing a bit of binding. Is it ok not to torque to full value if using a castellated nut? Should a bushing be used?
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tigerrick(at)mindspring.c
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| Posted: Wed Sep 08, 2010 8:53 pm Post subject: AN 115 Cable Shackle |
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Hi, Mike!
I don't think that standard torque values apply when using bolts as pivots, so I'd torque it down until you achieve the desired clearance, and then use a castellated nut cotter pinned in place through the hole in the bolt. (You DO have a hole in the bolt, right?)
A bushing? Only if more than normal wear is anticipated.
Just my opinion(s).
Rick
ZenVair N42KP
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psm(at)att.net
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| Posted: Thu Sep 09, 2010 2:48 am Post subject: AN 115 Cable Shackle |
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I agree with Rick. Torque doesn't matter here - only getting the right finished length on the "Pin".
One little trick I learned on this assembly. You have to connect this through the inspection hole and you can't see what you are doing very well. After much frustration I figured out the two ends of the hole drilled in the bolt are at different "Heights" on the thread. You need to tighten the nut so the "Higher" end is clear of the nut so you can insert the cotter pin. This can be easier if you mark the "Higher" side of the bolt with a felt tip marker so you can insert the cotter pin without being able to see your work.
Paul
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jaybannist(at)cs.com
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| Posted: Thu Sep 09, 2010 4:04 am Post subject: AN 115 Cable Shackle |
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One little trick I learned on this assembly - make all the aileron bellcrank connections BEFORE you close the wing.
Jay Bannister
[quote][b]
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psm(at)att.net
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| Posted: Thu Sep 09, 2010 4:25 am Post subject: AN 115 Cable Shackle |
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Hi Jay,
That is a great trick I figured out too. Unfortunately, it only works the first time you put your plane together.
With the NTSB pronouncement and my decision to ground my XL I wound up taking the wings off for storage in the corners of my hangar. Once you connect up the balance cable you are stuck connecting and disconnecting the cables through the tiny access holes in the wing skin. The most memorable feature of this task is you can't see what you are doing because your hand and arm are in the way. It gets worse when the cotter pin just refuses to go all the way through the bolt hole and out the other side.
The good news is after you have done this miserable job a few times it gets easier and quicker.
Paul
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of jaybannist(at)cs.com
Sent: Thursday, September 09, 2010 4:56 AM
To: zenith-list(at)matronics.com
Subject: Re: AN 115 Cable Shackle
One little trick I learned on this assembly - make all the aileron bellcrank connections BEFORE you close the wing.
Jay Bannister
[quote][b]
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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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| Posted: Thu Sep 09, 2010 5:44 am Post subject: Re: AN 115 Cable Shackle |
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Thanks all, by the way I'm also using castellated nyloc nuts just as an added safety measure in case a cotter pin is ever forgotten. I wouldn't want to rely on it without the cotter pin but it's better than nothing. They area available from spruce for about 1.20 each for an AN-3. I've decided to use them on all control cable bolts as a belts/suspenders approach. Just wanted to let ya'll know that they exist.
See below.
Manufactured to standard castle or shear nut specifications with a nylon insert added for positive safety. Use it throughout the control system. Should the cotter pin used with castle nuts be overlooked, the nut cannot work loose. The nylon insert will act as a stop nut.
Part No. Thread Size Price Each Buy
MS17825-3 10.32 $1.24
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steve.freeman(at)syntaxds
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| Posted: Thu Sep 09, 2010 7:36 am Post subject: AN 115 Cable Shackle |
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What NTSB pronouncement are you referring to? I lost track of the “wing flutter” issue for reasons to long and boring to go in to here. Is that what this is about? I never did hear the final resolution on that.
Thank you,
Steve Freeman
Building Again (semi-scratch – I can’t make a canopy and I don’t know how to weld) 650
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Paul Mulwitz
Sent: Thursday, September 09, 2010 5:21 AM
To: zenith-list(at)matronics.com
Subject: RE: AN 115 Cable Shackle
Hi Jay,
That is a great trick I figured out too. Unfortunately, it only works the first time you put your plane together.
With the NTSB pronouncement and my decision to ground my XL I wound up taking the wings off for storage in the corners of my hangar. Once you connect up the balance cable you are stuck connecting and disconnecting the cables through the tiny access holes in the wing skin. The most memorable feature of this task is you can't see what you are doing because your hand and arm are in the way. It gets worse when the cotter pin just refuses to go all the way through the bolt hole and out the other side.
The good news is after you have done this miserable job a few times it gets easier and quicker.
Paul
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of jaybannist(at)cs.com
Sent: Thursday, September 09, 2010 4:56 AM
To: zenith-list(at)matronics.com
Subject: Re: AN 115 Cable Shackle
One little trick I learned on this assembly - make all the aileron bellcrank connections BEFORE you close the wing.
Jay Bannister
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Thu Sep 09, 2010 2:33 pm Post subject: AN 115 Cable Shackle |
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You don't torque a fastener used in a cable shackle, you turn it down to a point that gives you enough clearance to prevent binding and allows the cotter pin to be inserted through the castle nut so it can't back off. Use one or two washers if necessary. You should always use a drilled shank bolt and castle nut when the bolt is used as a pivot point, never a nylock or similar lock nut alone.
On Sep 9, 2010, at 12:14 AM, MHerder wrote:
| Quote: |
WHen using an an 115 cable shackle, and torquing to the specified value for an AN 3, it is clamping to my aileron bellcrank and causing a bit of binding. Is it ok not to torque to full value if using a castellated nut? Should a bushing be used?
--------
One Rivet at a Time!
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Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
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