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Cable Rigging

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aletherington(at)rogers.c
Guest

Posted: Sun Mar 01, 2009 6:46 am Post subject: Cable Rigging

Can anyone direct me to something like "Cable Rigging for Dummies" ?   I 

thought this task would be straightforward, but I am baffled by 

AC43.13-1B page 7-333 which seems to suggest that if I start with 4 

threads in the turnbuckle barrel, and end with no more than three 

threads showing,  by some miracle the tension will be correct, and there 

will still be some way to adjust tension when the cables become slack. 

Whatever I am missing is probably obvious, but not to me.



Al Etherington



Scratch building 601XL

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sun Mar 01, 2009 8:05 am Post subject: Cable Rigging

You've got that backwards. In paragraph 7-166 it says you should start  

with three threads showing and you should end with no more than four  

threads inside the barrel. The threads will turn into the barrel as  

you tighten. Basically, you have a tolerance of seven turns on the  

turnbuckle to achieve correct tension. If you get correct tension with  

more than three threads showing, your cables are too short. If you  

have to turn the threads more than four turns into the barrel, your  

cables are too long. Remember, you have at least two cables and two  

turnbuckles for each control surface and both cables will have the  

same tension so you actually have a combined tolerance of fourteen  

turns to get it right.



The way I installed the cables was to first clamp the control surfaces  

in their neutral positions. Then install the thimble on one end of the  

cable and assemble the turnbuckles with several threads showing. Then  

install all the parts in their proper positions and pass the cable  

over the thimble in the unfinished end of the cable and pull it snug  

by hand and then clamp it. Then you disconnect that end of the cable  

and crimp the fitting.



 	  Quote: 	
		  

 

 >



 Can anyone direct me to something like "Cable Rigging for  

 Dummies" ?   I thought this task would be straightforward, but I am  

 baffled by AC43.13-1B page 7-333 which seems to suggest that if I  

 start with 4 threads in the turnbuckle barrel, and end with no more  

 than three threads showing,  by some miracle the tension will be  

 correct, and there will still be some way to adjust tension when the  

 cables become slack. Whatever I am missing is probably obvious, but  

 not to me.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

dgardea(at)gmail.com

Joined: 26 Mar 2007
Posts: 50
Location: Indianapolis, IN

Posted: Sun Mar 01, 2009 9:19 am Post subject: Re: Cable Rigging

Please archive Bryan's post .. this is excellent advice



 	  Quote: 	
		  "You've got that backwards. In paragraph 7-166 it says you should start 

with three threads showing and you should end with no more than four 

threads inside the barrel. The threads will turn into the barrel as 

you tighten. Basically, you have a tolerance of seven turns on the 

turnbuckle to achieve correct tension. If you get correct tension with 

more than three threads showing, your cables are too short. If you 

have to turn the threads more than four turns into the barrel, your 

cables are too long. Remember, you have at least two cables and two 

turnbuckles for each control surface and both cables will have the 

same tension so you actually have a combined tolerance of fourteen 

turns to get it right. 



The way I installed the cables was to first clamp the control surfaces 

in their neutral positions. Then install the thimble on one end of the 

cable and assemble the turnbuckles with several threads showing. Then 

install all the parts in their proper positions and pass the cable 

over the thimble in the unfinished end of the cable and pull it snug 

by hand and then clamp it. Then you disconnect that end of the cable 

and crimp the fitting."

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_________________
Dave Gardea
CH650 - Corvair - flying!
http://n631dg.t15.org/home.html

aletherington(at)rogers.c
Guest

Posted: Mon Mar 02, 2009 5:19 am Post subject: Cable Rigging

Bryan Martin wrote:

 	  Quote: 	

 <bryanmmartin(at)comcast.net>

 You've got that backwards. In paragraph 7-166 it says you should start 

 with three threads showing and you should end with no more than four 

 threads inside the barrel. The threads will turn into the barrel as 

 you tighten. Basically, you have a tolerance of seven turns on the 

 turnbuckle to achieve correct tension. If you get correct tension with 

 more than three threads showing, your cables are too short. If you 

 have to turn the threads more than four turns into the barrel, your 

 cables are too long. Remember, you have at least two cables and two 

 turnbuckles for each control surface and both cables will have the 

 same tension so you actually have a combined tolerance of fourteen 

 turns to get it right.

 The way I installed the cables was to first clamp the control surfaces 

 in their neutral positions. Then install the thimble on one end of the 

 cable and assemble the turnbuckles with several threads showing. Then 

 install all the parts in their proper positions and pass the cable 

 over the thimble in the unfinished end of the cable and pull it snug 

 by hand and then clamp it. Then you disconnect that end of the cable 

 and crimp the fitting.

>

> 

> <aletherington(at)rogers.com>

>

> Can anyone direct me to something like "Cable Rigging for Dummies" 

> ?   I thought this task would be straightforward, but I am baffled by 

> AC43.13-1B page 7-333 which seems to suggest that if I start with 4 

> threads in the turnbuckle barrel, and end with no more than three 

> threads showing,  by some miracle the tension will be correct, and 

> there will still be some way to adjust tension when the cables become 

> slack. Whatever I am missing is probably obvious, but not to me.

>

Thanks for the reply, Bryan:

That's not the first thing I've got backwards.  It still seems like a 

very narrow window, but I guess you get more tension per turn than I 

would have thought.

Al Etherington

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