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Shame on you, Servo !!!

Posted by Stefan Olofsson on April 14, 2011 at 12:18am

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After almost at year with a strange servo jitter that was taking all the fun out of my UAV hobby i finally found the source. A bad servo.

 

The jitter was intermittent and made and erratic +- 5 mm throws on the elevator or rudder even when i tried flying  in "manual mode".

 

The little bastard finally decided show its real face today by giving a "full down" (and i mean FULL) right after start, giving my Easy Star a nice sucker punch right on the nose.

 

So, Turnigy S 3317 S. Your life was short and noisy, and you will not be missed.

I am moving on now and will look for a more dependable partner. :-)

 

I know some of you are doing UAV flying for a living. What brands of servos are you using?

 

 

 

 

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Comments

  • Chris Card April 14, 2011 at 7:37pm

    I've had a "bad servo" occurrence about a couple months back.

    I was a spektrum dsp75 servo.

    It was is installed in a seawind foamy and connected to the APM while bench testing.

    Take note that I had removed the power jumper on the APM board so that the RX & servos would be power seperately.

    Well at some point during testing, with everything connected I powered up the APM after powering up the RX and the little sun of a gun went clear on past the mechanical end stops only to be stopped by the rudders' unwillingness to to go further.

    This occurred during the first 1/4 second of the APM power up.

    After replacing the servo with a brand new one a week later it happened again.

    I'm not sure if the DSP servos are acting on brief fluctuations from the APM when it gets powered up or what??

    So now I'm scared of them & I replaced the with some HS55's.

    Now I'm wondering about the HS55's cause of this posting.

    ???

     

  • DaveyWaveyBunsenBurner April 14, 2011 at 5:44am

    @I.S

    Yes, I believe its called karbonite, but believe other manufacturers are also releasing similar:

    http://www.modelzone.co.uk/hitec-635-high-torque-karbonite-gear-ser...

  • DaveyWaveyBunsenBurner April 14, 2011 at 2:29am

    @Stefan

     

    There are also some new gear materials that are the best of both worlds coming out from suppliers. Metal gears have a tendancy to wear quite quickly, plus they are heavy. The new plastics are tougher than nylon but wear less....

  • Distributor
    Stefan Olofsson April 14, 2011 at 2:27am
    Thanks for your insight. It sounds like metal geared servos are the dish of the day
  • Russell B. Sutton April 14, 2011 at 2:26am

    This is a nice way to tune your servo power voltage. 

    http://www.robotshop.com/dimension-engineering-de-swadj.html

  • Russell B. Sutton April 14, 2011 at 2:16am
    I like my Jr digital servo's.  Servo voltage and power supply is very important as well.  Good Luck
  • Moderator
    Gary Mortimer April 14, 2011 at 2:11am
    Ya gets what ya pays for.
  • DaveyWaveyBunsenBurner April 14, 2011 at 1:51am

    I'm with Martin!

     

    Futaba servo's are expensive but very good quality. I had experimented with Hi-Tec's in my previous easystar but they twitched all over the place, the interference suppresion seemed absolutely zero.

     

    I would imagine all the major brands are equally good.

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