[SEL] Life happens!!

[brent]

Rob thanks for the info found that useful and interesting  in a practical
motorist mag i came across a similar article that mentioned fraying the end
of the cable into a ball shape to fit inside the metal  lug instead of
babbit they used solder to hold it in place.brentnz

----- Original Message -----
From: "Rob Skinner" <rskinner at rustyiron.com>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Saturday, December 22, 2007 4:15 AM
Subject: Re: [SEL] Life happens!!


>   On Dec 21, 2007, at 12:15 AM, maytagtwin at aol.com wrote:
> >
> >  then tip them a
> > little and use a boring bar to cut the internal taper.
>
>
> That's quite insightful, Ron.  I'll try to describe the shackle
> arrangement used on elevators for many years -- an application that
> must have 100% reliability.  Perhaps it will help you in your design.
>
> The "socket" of the shackle is a taper, as you described.  The big end
> is a more than twice the diameter of the wire rope.  The wire rope is
> threaded through the shackle, then the individual lays of the cable
> unwound so they "fray" out in a cone shape.  Each lay is then turned
> back in on itself, into the middle of the rope.  This is called a
> "rosette."
>
> Each loop of the rosette must be exactly like all the others and the
> length appropriate to match the shackle.  When all the lays are done,
> the rope is pulled back into the shackle.  Being more than twice the
> diameter as it was originally, the rope will not pull through the
> shackle.
>
> At this point, the rope/shackle will hold a load, but it will need to
> remain in service for many years and measures must be taken to assure
> than nothing shifts from it's current configuration.  While inverted,
> babbitt is poured into the shackle to lock the rope in place.  The
> babbitt is just to hold it all together;  it does not carry a load.
>
> Have a Merry Christmas,
> Rob
>
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