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Re: rotor backlash



Hello Steve and Mike,
Excuse me in entering in your conversation,without beeing requested.
- There are several mechanical and structural points to be
considered,naturally
any support shoud be as tight as possible.Crank up towers,square or tubing
type
towers, when they have exessive slack, I think some thing is wrong with the
set up
because these structures are tight in the adjustment,just only for slipping
between parts.Or the crank out positions is more than specified,or they need
urgent mainte-
nance and adjustment.Any rotor box has a normal gear slack wich is build in
the gears,
otherwise the gears will break.Please remember that the "fiering angel" of a
beam
is not a straight line,may be an angle of 10 - 15 deg so a backlash of  1-2
deg does not matter.Excuse my writing.
Best regards,Nicolau - PP8DA
----- Original Message -----
From: STEVE DIGGS <steve.diggs@totrbbs.radio.org>
To: <amsat-bb@AMSAT.Org>
Sent: Sunday, October 03, 1999 7:35 PM
Subject: Re: [amsat-bb] rotor backlash


> ->   Now when the AZ rotor moves and stops while tracking, the whole
> -> system swings back and forth several degs. Some times causing the AZ
> -> rotor to move back and forth trying to point at the satellite. I
> -> didn't have this problem with the old 7 1/2 ft cross boom.
>
> Hi Mike,
> I have observed the same effect. I am using an 8 foot solid fiberglass
> boom from Max-Gain Systems here in Georgia. In addition to my sat beams,
> I have a Moseley TA-33 Classic HF beam on the mast.
>
> I believe the problem is due to two basic forces at work: momentum
> created by getting a weight with a large turning radius moving, then
> trying to make a quick stop. Secondly, I didn't guy the top section of
> my crank-up tower, so therefore I have no damping effect at the top.
> Does my situation compare to yours any?
>
> Regards,
> Steve Diggs W4EPI
> EM73
>
> ----
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>

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