Servo oscillation help

[Grow Pattern]

Tom,
           I have also seen this happen with servos that can't handle too 
high a voltage. A freshly charged 4-cell pack can cause the dreaded "servo 
dance".

Secondly the TX antenna could be too close to the servo leads. Try moving it 
a few feet away and see if it stops

My SWAG of the day.

Eric.


----- Original Message ----- 
From: "Troy A. Newman" <troy_newman at msn.com>
To: <discussion at nsrca.org>
Sent: Thursday, January 27, 2005 7:13 PM
Subject: Re: Servo oscillation help


> Bad or poor quality servo extension lead will cause this too. A Heavy
> control surface can cause it as well. Although that servo is the not most
> precise I would not think it would be fighting itself to find center. A
> higher precision servo could show this sign as they are very accurate 
> around
> center. Not saying to replace the servo just saying that lots of things 
> can
> cause this and saying that the servo deadband being too tight is probably
> not one of those things on that servo....The reason being is those servos
> are not super digital precision....
>
> I would replace the extension leads and se if that solves it! I have found
> similar stuff with aftermarket leads. Several companies are selling them
> pretty cheap and I have found that many cases they just are not up to 
> snuff.
> I choose only JR gold HD extensions. Even in Jenny's trainer I swapped out
> the extension for Ailerons to a HD gold version.
>
>
> Troy Newman
> Team JR
> ----- Original Message ----- 
> From: "Tom Simes" <nsrca at shinymetalass.com>
> To: <discussion at nsrca.org>
> Sent: Thursday, January 27, 2005 10:26 AM
> Subject: Servo oscillation help
>
>
>>
>> I've got a problem with an aileron servo that I'm hoping the collective
>> wisdom here knows an easy remedy for.  On one of my ailerons about one
>> in three times when the surface is at neutral if I pluck the aileron or
>> let the stick bang back to center, the servo will go into oscillation.
>> A very light pressure or slight stick displacement will stop it, and it
>> only occurs when the servo is at center.  As far as I can tell it's
>> not happening in flight (my guess is the aerodynamic forces are
>> dampening it).  The first time I noticed it, I immediately thought the
>> pot had a problem around it's center point so I swapped in a brand new
>> servo (same type, Futaba 3004). To my surprise the new servo acted
>> exactly the same way, so that lead me to believe the problem is not with
>> the servos.  Now my guess is I've somehow perfectly balanced the
>> mechanical linkage resistance to the servo's startup force.
>>
>> At this point I'm thinking about sealing the aileron gap in hopes of
>> changing the mechanical resistance a smidge.  Has anyone else seen or
>> solved this problem?
>>
>> Thanks!
>>
>> -- 
>> Tom
>>
>> _____________________________________________________________________
>>
>>        |  ,  |               Tom Simes
>> ---------(@)---------        AMA 230068
>>         --|--                NSRCA 3830
>>           '                  nsrca at shinymetalass.com
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