Thanks for clarifying that. Even 500 in pounds isn't
enough for really hard to crank winches, like mine,
but using different size sprockets would allow you
to get a additional mechanical advantage of 2, 3, 4
or even 5. What I learned with my KW3000 is that
if the crank is this hard to turn, you have overloaded
the winch and it will eventually fail.
Why not drive the crank directly instead of using
sprockets if the sprockets are 1:1?
Rick N6RK
On 8/1/2014 10:23 AM, Ralph Bolt via TowerTalk wrote:
Rick:
The motor shaft is 1/2 inch diameter. You mistook the size of the keyway for
the shaft size. The motor develops 1/9 HP which when geared down from it's
approximate motor speed of 1600 rpm to the 10 rpm out of the gearbox easily
develops the 500 inch-pounds of torque. It's a very hefty motor and gearbox.
Nominal current draw by the nameplate is 3.6 amps. I put my clamp-on ammeter
on it while raising the tower and it drew just 3.0 amps. So the motor is not
overtaxed.
Ralph, K0HML
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