[TowerTalk] Lockwasher comparrison

[Don W7WLL]

My ME always claimed the last turn on any nut, lockwasher or not, will strip 
the bolt/screw or snap it off. Of course, without the last turn,  the nut 
will fall off, with or without a lockwasher. I found that to be true only 
once in awhile, but I learned quickly to check the bolts (and lockwashers) 
holding my T2X in place at least once a summer, as there was always one 
coming loose it seemed.

I also learned it was a mistake to allow any mechanical object to realize I 
was in a hurry.

Don W7WLL

-----Original Message----- 
From: jimlux
Sent: Sunday, July 24, 2016 8:47 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Lockwasher comparrison

On 7/24/16 8:11 PM, Roger (K8RI) on TT wrote:
> This video shows the comparison between various ways of locking nuts.
> The reaction to a lock washer and vibration was a real surprine. Only
> one method actually worked.
>
> https://www.facebook.com/Trustmeiamamechanicalengineer/videos/746827738792165/
>
>

Well, there's also using a threadlocking adhesive (Loctite) and safety
wire...

Lockwashers are widely acknowledged to be worthless in actually locking.
  What's important is having enough bolt stretch (which in turn is
dependent on good lubrication of the threads if you're measuring
torque).  If you have enough bolt stretch, the load on the "inclined
plane" of the threads is sufficient to prevent the nut from vibrating off.

temperature cycling makes it tougher,of course.


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