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Re: [TowerTalk] Rotor Selection

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Rotor Selection
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 06 Apr 2014 01:59:29 -0400
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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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