[R-390] reply to Chris's loose screws

[Roger Ruszkowski]

Bob,

I quite agree we went to a red Loctite for navy ship systems.
I do not know who picked the red stuff or why that flavor was chosen.
But Loctite has got to be the best stuff since a double knot 
in you shoe laces.

But the question was why in 55 did they add lock washers.
Because in 55 Loctite was not yet invented.

Roger.


-----Original Message-----
From: rbethman <rbethman at comcast.net>
To: r-390 <r-390 at mailman.qth.net>
Sent: Sun, Mar 2, 2014 8:26 pm
Subject: Re: [R-390] reply to Chris's loose screws


List,

If "we" really worry about vibration, then I would suggest what we used 
for R/C Helicopters.

We used the Blue Loctite.  It resolved the loosening issue.  Also, it 
DOES come undone when using normal hand tools!

A single drop or slightly less on the threads WILL do the job.  I never 
had a helicopter come apart.

I have observed two that did NOT heed the advice!  They became a kit 
once more, requiring many parts to be replaced.

This is important - as the purple and others "may" require heat to be added.

I use either one when the situation dictates.

Regards,
Bob - N0DGN


On 3/2/2014 7:54 PM, Chris wrote:
> By conventional wisdom, that split washer should be be under the head of the 
screw, not the nut as it is held captive and not allowed to turn more than a few 
degrees by the clamp.
>
> By more modern knowledge, that split washer does basically nothing to prevent 
the joint from loosening-  Point in case, how many split lock washers are used 
on that new car that mysteriously doesn't vibrate apart?  VERY few washers of 
any kind are used, with exception of electrical grounds.
>
> For those integrated in the real facts about lock washers, and hardware in 
general, below is one of many very interesting an enlightening articles out 
there:
>
> http://www.boltscience.com/pages/vibloose.htm
>
> Regards,
> Chris
>
>

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