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vibration effects on bolts

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grahamsingleton(at)btinte
Guest

Posted: Sat Jul 05, 2014 3:15 am Post subject: vibration effects on bolts

All

this is a very interesting article explaing how bolts loosen due to vibration.

Very interesting.



http://www.boltscience.com/pages/junkertestvideo.htm



Graham

 [quote][b]

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duanefamly(at)aol.com
Guest

Posted: Sat Jul 05, 2014 5:55 am Post subject: vibration effects on bolts

This is a very interesting video. It shows how, even with locking washers, bolts and nuts simply back-off under vibration. But it stops there. No help about what to do to prevent this problem. More research, I guess.

   

  Mike Duane

   

   

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nigel_graham(at)m-tecque.
Guest

Posted: Sat Jul 05, 2014 9:54 am Post subject: vibration effects on bolts

I couldn't help smiling while reading this. 

     I am involved with the restoration of a Jaguar XK120 and a few     months back, visited an ex Jaguar racing mechanic (well past     retirement age) at his immaculate workshop while searching for     obscure bits. During a very interesting discussion, he explained     that years ago, Jags were plagued with problems with the bell     housing bolts backing out during endurance races. The solution,     discovered by trial and error, was to replace the helical spring     washer with plain washers.

     These old timers know a thing or two!

     Nowadays we have technology on our side - and thread locker.

     

     Nigel

     

     On 05/07/2014 14:54, duanefamly(at)aol.com (duanefamly(at)aol.com)       wrote:

     

     [quote]         This is a very interesting video. It shows how, even with           locking washers, bolts and nuts simply back-off under           vibration. But it stops there. No help about what to do to           prevent this problem. More research, I guess.

          

         Mike Duane

          

          

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Duncan McFadyean

Joined: 18 Jan 2011
Posts: 224

Posted: Sat Jul 05, 2014 11:57 am Post subject: vibration effects on bolts

 	  Quote: 	
		    <<<Nowadays we have technology on our side - and thread locker>>>

    

   And wire locking!

    

   DMcF.

 	


 

 

 

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Sat Jul 05, 2014 12:18 pm Post subject: vibration effects on bolts

I’ve read that the reason for the XK120 being a two seater was to provide space for a mechanic to ride along at all times…

On Jul 5, 2014, at 10:53 AM, Nigel Graham <nigel_graham(at)m-tecque.co.uk (nigel_graham(at)m-tecque.co.uk)> wrote:

[quote]                   I couldn't help smiling while reading this. 

     I am involved with the restoration of a Jaguar XK120 and a few     months back, visited an ex Jaguar racing mechanic (well past     retirement age) at his immaculate workshop while searching for     obscure bits. During a very interesting discussion, he explained     that years ago, Jags were plagued with problems with the bell     housing bolts backing out during endurance races. The solution,     discovered by trial and error, was to replace the helical spring     washer with plain washers.

     These old timers know a thing or two!

     Nowadays we have technology on our side - and thread locker.

     

     Nigel

     

     On 05/07/2014 14:54, duanefamly(at)aol.com (duanefamly(at)aol.com)       wrote:

     

     [quote]         This is a very interesting video. It shows how, even with           locking washers, bolts and nuts simply back-off under           vibration. But it stops there. No help about what to do to           prevent this problem. More research, I guess.

          

         Mike Duane

          

          

         --

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erichdtrombley(at)juno.co
Guest

Posted: Sun Jul 06, 2014 7:16 pm Post subject: vibration effects on bolts

Graham,

 

Thank you for forwarding the link.  Great information.

 

Duane,

 

There is a wealth of information on the website, including why nuts loosen and an assessment of common locking methods, including double nuts, and Loctite.  Interesting the site claims that friction lock nuts (prevailing torque) like those used in aviation are little more that bolt retaining devises under transverse joint movement.  

 

Erich

N28ET

Classic Mono 914

Oshkosh bound!!!

  



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