[TowerTalk] Fwd: FW: Fwd: Worm Gears

[Hans Hammarquist]

I don't remember the exact formulas and I am not sure if it is only valid for worm gears but it turns out then you calculate efficiency for gear boxes you have a different efficiency depending on which direction the power goes.


It turns out that when the efficiency is 50% when down-shifting, the efficiency is 0 when up-shifting. I am sure you noticed that is very hard ( if not impossible) to turn the output axle on a worm gear. (It is ~50 years ago I had this class, 1966). I suspect the same is valid for any gear box but let somebody else answer that.


73 de,


Hans - N2JFS



-----Original Message-----
From: Matt <maflukey at gmail.com>
To: towertalk <towertalk at contesting.com>
Sent: Wed, Jul 15, 2015 12:13 am
Subject: [TowerTalk] FW:  Fwd:  Worm Gears


???  Please explain.

KM5VI

-----Original Message-----
From: TowerTalk
[mailto:towertalk-bounces at contesting.com] On Behalf Of Hans
Hammarquist via
TowerTalk
Sent: Tuesday, July 14, 2015 4:25 PM
To:
towertalk at contesting.com
Subject: [TowerTalk] Fwd: Worm Gears

Any gear with
a 50% or better efficiency is NOT self breaking and will
require a break. Even
a slightly lower than 50% might (most possible) need a
break as the efficiency
will increase with time as the gear will "wear in".


Hans -
N2JFS



-----Original Message-----
From: Wilson
<infomet at embarqmail.com>
To: John Santillo N2HMM <n2hmm at warwick.net>
Cc:
towertalk <towertalk at contesting.com>
Sent: Tue, Jul 14, 2015 1:37 pm
Subject:
Re: [TowerTalk] Worm Gears


Hub City touts their helical gear units, at 90+%
efficiency vs 60% for
worms.
I
don't know about their resistance to back
driving, but at 50-60:1, it
wouldn't take much of a brake...
WL






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