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Posted by DerbyDad03 on May 4, 2008, 10:15 pm
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> > > BobR wrote:
>
> > > > dpb wrote:
> > > >> BobR wrote:
> > > >> ...
> > > >>> Let me put it this way...I am building an airplane and using the n=
ylon
> > > >>> insert nuts for most applications with a few critical exceptions w=
here
> > > >>> only a castle nut and cotter pin is acceptable. I don't use and
> > > >>> wouldn't even consider using lock washers on anything. ...
> > > >> I don't know airframe rules, but if you mean "anything" within the
> > > >> ordinary English meaning, that's simply silly...
>
> > > >> --
>
> > > > When building a plane, if the screw or bolt is important enough to
> > > > have any lock washer it is important to make sure you use one that
> > > > won't come loose. If you consider that silly, do your wife and all o=
f
> > > > us on the ground a favor and don't build yourself an airplane.
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> > > You obviously didn't _read_ or at least comprehend what I wrote...
>
> > > --- Hide quoted text -
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> > > - Show quoted text -
> > >I read it, understood it completely and really considered you rather
> > >silly for having written it. =A0You had nothing useful to add so you
> > >wasted everyones time.
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> > WOW. =A0From now on when I go on a plane, I'm going to look to see what =
kind
> > of system they use. =A0I really don't think I've seen a lock washer yet.=
=A0Most
> > of the stuff I see has plastic push fasteners. =A0I must be dense as a r=
ock.
> > I thought they would use all sorts of fasteners depending on the
> > application. =A0Now to find out they use only a few. =A0Oh, dopey me.
>
> > Steve- Hide quoted text -
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> > - Show quoted text -
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> Well maybe you should look at what is used on aircraft instead making
> assumptions. =A0While there are mil-spec lock washers that were used on
> some aircraft, they are never used in an area where safety could be
> compromised by them coming loose. =A0In safety critical areas, either
> castle nuts and cotter pins are used or safety wire is used. =A0Nylon
> insert nuts are now the preferred choice in all instances where castle
> nuts and/or safety wired is not required. =A0My own feeling is that if
> it is important enough to need a lock washer, it is important enough
> to use a high quality nylon locking nut.
>
> If however you are talking about holding pieces of plastic together
> for cosmetic panels, you can use all the plastic push fastners you
> want.
>
> On another post you commented on the "single" use of the nylon insert
> nuts and this may be correct if you are using the common cheap Home-
> Depot made in China hardware. =A0I have found that aircraft grade nylon
> insert nuts will still provide a firm tight hold after two or three
> cycles. =A0I wouldn't recommend them for more than that though.- Hide quot=
ed text -
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> - Show quoted text -
We use nylon insert nuts torqued to up to 168 inch pounds and loosen
and tighten them on fairly regular basis. It takes many, many cycles
before we can't tighten them anymore. On the other hand, we've had
some that can't be torqued even once, but that's very rare.
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