Re: Need speed switch for DIY funicular/hillside elevator

[astutesolutions@xxxxxxxxxxxxx]

>
> Elevators often have a brake that is held off by the cable tension where
> it attaches to the cab.  you can do the same thing, the cable attachment
> holds open a brake that would grab the rails.  If the cable breaks or
> loses all tension the brakes grab.  Even if the cable slacks, there
> should still be tension at the cart attachment point.  This is totally
> automatic, no user input.
>
> --
> Free men own guns - www.geocities/CapitolHill/5357/

Nick, I undestand what you are saying.  I suppose you just have to be
there to see it, but the cable is quarter inch aircraft cable and is
pretty stiff.  It is long too, over 150 feet.  When that cart goes down
in a freespool condition (drums rotating freely) it will be dragging
that cable down with it.  As it drags it down there is going to be some
tension there because the drums/spools have some inherent resistance
until they build up speed.  Even when the cart goes down, the cable
sags in between the supports some.  I guess what I'm trying to say is
that I don't know an easy way to indicate that tension drop.

In the event that both the cables snap, this would work beautifully,
but both would have to break at the same time, and each one is rated
for about 7,000 lbs.  Thanks!