Just picked up a NEW Fulton KW3000 Worm Gear Style Winch today which I plan
to use with a 1/2 inch variable or low speed Drill motor to tilt a
LM-470D tower that has around 1300 lBs dead weight on the cable when
tilting.
Anyone have any bad experience with this particular winch ?
Will it hold under load or tend to creep. I don't intend to not lock down
the
handle but good be good to know any anomalies with this setup
BTW they are on sale right now at Grainger for $143.( while supply lasts
whatever that means )
73, Dennis N6KI
On Mon, Jul 20, 2009 at 12:27 PM, Dan Zimmerman N3OX <n3ox@n3ox.net> wrote:
> >
> > Depends on the particular worm gears (more specifically, the pitch of
> > the worm). It's like whether you can backdrive a lead screw. Sometimes
> > you can, sometimes you can't. The finer the pitch (= higher numerical
> > gear ratio) the more likely you can't backdrive.
> >
>
> You have to be a little careful too, even if it "appears" to be self
> locking.
>
> The mechanism that disallows back-driving is ultimately that the static
> friction becomes stronger and stronger under load when you try to
> backdrive,
> "locking" the thing in place.
>
> But if you have some vibration and a moderate load, just like any other
> frictional pinning, it might creep.
>
> And if it gets going, then you aren't looking at a static friction
> situation
> anymore, and it might not be *dynamically* self locking.
>
> And as N2JFS says, it might be easier to backdrive over time.
>
> So I'd say don't rely on it. And that's what worm gear drive manufacturers
> would say: don't rely on a self locking worm drive in place of a proper
> braking system in an application where it may be dangerous if it slips.
>
> 73
> Dan
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