You are correct. The friction is reduced during motion, especially when
greased. An other factor is that the efficiency gets reduced when the worm gear
start to "wear in" as the surfaces get polished during operation.
The bottom line is that you should chose a gear with much less than 50%
efficiency if you want to be somewhat sure the gear box is self-breaking.
Hans - N2JFS
-----Original Message-----
From: David Robbins <k1ttt@verizon.net>
To: towertalk <towertalk@contesting.com>
Sent: Thu, Jul 16, 2015 10:14 am
Subject: Re: [TowerTalk] Fwd: Fwd: FW: Fwd: Worm Gears
doesn't it get even uglier than that? at 50% if you stop the worm gear it
would stay put, but if it gets bumped and starts moving the friction needed to
stop it is more than the friction needed to keep it from starting under a
constant load. So while 50% might be the break point, you actually need it
lower to make it self breaking, low enough to overcome the sliding friction when
it is running to bring it to a stop.
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