At 03:27 PM 3/17/2007, Rick Karlquist wrote:
>1. I have an HDX5106 with a 2550. I feel that this winch is
>overloaded, in the same way that the guys with the "little" towers
>feel their 1550s are overloaded. Is there something even bigger
>than the 2550 I can convert to?
>2. I realize these winches have an enviable track record, but
>why should I want to fool with a winch having a "squeeler" brake
>as opposed to a worm drive winch?
BTW, while for most worm drives you can't "back drive" them, for some
you can. It depends on the worm gear pitch and tooth shapes.
> Worm drive seems much more
>logical to me. What I would really like to do is get worm drive
>winch that is geared down another factor of 5 or 10 compared to
>the 2550 and then use an electric drill on the shaft.
I would imagine that you can get such a thing from a place that does
machinery. You can buy an off the shelf worm/pinion reducer for
whatever ratio you want (100:1 isn't unusual), and then couple that
to a cable drum. They also make nifty little "anti runaway" clutch
widgets that rely on centrifugal force to engage a brake when the
rotational speed gets too high.
I offer the following mechanical ideas for folks who want to think
about "other ways to do it"..
1) Hydraulics! A 5 HP motor is about the size of an apple, and are
ideal for low speed, high torque applications. You use a low
displacement unit on your electric motor (which spins fast) and a
high displacement unit on your cable drum (which spins slow). Et
voila, hydraulic gearing! (you'd probably still need some sort of
spur gearing.. there IS a limit on practical ratios just with
hydraulics) You can limit the speed at which it travels in one
direction with a check valve and bleeder (a standard item for hydraulics)
2) The things that they use for belaying on those portable climbing
walls. Basically, a bunch of passes of the cable back and forth
between a multi sheave pulley, with a hydraulic cylinder to limit the speed.
3) Counterweights... they work for elevators, they can work for you
too (especially with the multi part block and tackle scheme described
above, so the cable movement is 5-6 times the movement of the
counterweight..) This is especially convenient if you have a spare
multi thousand pound counterweight around. (e.g. a cubic yard of
concrete weighs several thousand pounds)
All of these will potentially be more expensive than a few hundred
bucks for an off the shelf winch from Fulton, etc. However, if you
happen to have some of the parts around, perhaps not.
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