[TowerTalk] Rotor Selection
Roger (K8RI) on TT
K8RI-on-TowerTalk at tm.net
Sun Apr 6 01:59:29 EDT 2014
On 4/5/2014 3:06 PM, Patrick Greenlee wrote:
Sounds like a reasonable approximation to me. <:-))
73
Roger (K8RI)
> I am definitely not a worm drive expert and was just relaying some
> info I had read but not necessarily recalled accurately. When I was
> presented here with information above my level of experience but in
> conflict, at least a little bit, with my recollections of a previous
> source I thought it better to consult the oracle/guru friend who has
> MS in Mech Eng from UCLA and 35+ years of hands on experience. Here
> are his comments.
>
> Patrick - The standard ratio for non-freewheeling is 15:1, but
> depending on the pwr source, electric mtr, arm and crank, etc, the
> direction of load, the direction of drive, and lubrication/friction in
> the gears; that may need to increase. If the load is loading the gear
> in the same direction that the worm is driving the gear then a motor
> shut off may not stop the gear from continuing to turn. If the worm
> is turning opposite the gear load direction then the worm would stop
> the gear when the motor is shut off. An electric brake on the motor
> windings normally will stop the first condition and is normally not
> necessary for the second condition. The first condition may need 20+:1
> to stop the worm turning when the motor is shut down without the
> electric brake. In the static condition of worm to gear, 15:1 should
> work.
>
> I did not go into detail with him regarding the cheap and dirty
> approximation type gears so his comments are most likely aimed more
> toward the "real" worm drive situation.
>
> Patrick NJ5G
>
>
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