I bought a Fulton KW3000, and I think it's a true worm gear drive. It has a
51:1 ratio. I plan to use it to raise my fold over tower. I'm powering it with
a wheelchair motor.
In one of the views here
http://www.etrailer.com/Winches/Fulton/FKW30000103.html you can see the gears.
73, Mike NF4L
On Apr 4, 2014, at 2:13 PM, Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net> wrote:
> On 4/4/2014 12:26 PM, ftravanty wrote:
>> The only type of hand winch I would trust is one like a Fulton 1500 or 2500
>> that has a self actuating brake, and is in good working condition. A winch
>> with a re moveable handle which is part of the self actuating brake, or one
>> that can free wheel, being held by muscle power, can be very dangerous for
>> tower work.
>
> I like the latch on mine and other than a lapse in judgement feel it's quite
> safe. Going up or down, the latch only lets you go in one direction and if
> you let go, it can't freewheel. Noisy, but adds little friction to the work.
>
> I'd like to get a worm gear drive and convert it to a real worm gear, worm
> gear wheel type drive. They take very little effort on the crank, but the
> gear ratio is such that it can't freewheel when the driving force is applied
> from the output end. I think it'd be worth the extra money.
>
> A single flute worm with a 20 tooth worm gear wheel would have a 20:1 ratio,
> while a 2 flute worm would have a 10:1 ratio with the same size worm gear
> wheel. The conversion is fairly simple as you only need a worm gear wheel of
> the right diameter and pitch which should be the same # of teeth you have in
> the original setup. They do need a fairly rigid mount. (no play in the
> gears and they should be fully meshed).
>
> If you really want to know if it will be self locking it "depends on the
> lead angle, the pressure angle, and the coefficient of friction; however, it
> is approximately correct to say that a worm and gear will be self-locking if
> the tangent of the lead angle is less than the coefficient of friction."
> (Wikipedia) <:-))
>
> 73
>
> Roger (K8RI)
>
>
>
>> Frank W9JCC
>>
>> On 4/4/2014 11:00 AM, towertalk-request@contesting.com wrote:
>
> When using digest replies, please include the subject other than digest
> number.
>
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