Real Primo way to junk a perfectly good rotator, what he did not know
was how much torque reduction was lost doing this. If you
use one proberly with the proper DC voltage to the motor they turn as
fast as a commercial rotator, only with about 100 times the torque,
dont ruin a good prop pitch with such a mod as this. I have several
that have been ruined with this mod, and have reversed it by putting
back the original bell gears. Any one have any spares or junkers
they want to get sell ? I need some parts to fix a couple more of
these cut off gears some one was so eager to "fix".
73 Merv K9FD
>
>
>Hi All
>
>Here's something I found in the 1949 June QST that might
>be of some interest to the guys with prop pitch motors.
>The article was "Speeding up prop pitch beam rotors"
>
>Here's a way to speed up the rotation of a prop pitch without
>external speed up gears, V-belts or speeding up the motor
>until it burns out. Here's how it's done--remove:
>
> 1) the bevel gear;
> 2) its thrust bearing plate;
> 3) the upper case of the speed reduction unit housing;
> 4) the large ring gear with the spline on it;
>
>This last item is the first thing you will see upon removing Item
>3.
>
>Grind the teeth off the hardened splined ring gear. (Not off the
>splined portion, but off the inside of the ring!) Next drill and
>tap
>four holes in the gear carrier over which the ring gear was
>placed.
>Line up the holes with the holes that already exist in the face
>of
>ring gear, and bolt the two together. Reassemble the whole thing
>and fill it with oil. You can now turn your beam at 4 or 5 RPM.
>To reduce this to a more-comfortable 2 RPM, it is only necessary
>to reduce the voltage to the motor. Don't worry about the slight
>reduction in power caused by "short circuiting" one of the
>several
>planetary gear sets. It will still have enough steam to "rotate
>the
>house should the beam get stuck."
>
>This original article appeared in "Hints and Kinks" in the
>magazine
>and was written by W2VLL
>
>73
>Tom W7WHY
>
>--
>FAQ on WWW: http://www.contesting.com/towertalkfaq.html
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>
>
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