DuBro Servo Arms-JR Servos

[Bob Pastorello]

Thanks to all for the replies!  Matt/Ed - I'm using the long screws.  They actually have a separate p/n from Horizon...and they work really well.
    The slop - I discovered - IS vertical play in the output gear.  Actually appears to be in the base of the main gear where the pot actuator rests.  Doesn't look like it's missing any spacers; the bearing has the top o-ring.  These are JR 8231's...I seem to remember kind of a fiber-washer/spacer thing below the o ring but on top of the ball bearing race...    
    Does that sound familiar?

This isn't a big deal, as the arms are tight, and the screws plenty long enough.  Just hadn't run into noticing this kind of play in the system before.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Saturday, November 29, 2003 12:35 PM
  Subject: Re: DuBro Servo Arms-JR Servos


  In a message dated 11/29/2003 10:31:19 AM Eastern Standard Time, rcaerobob at cox.net writes:



    Subj:DuBro Servo Arms-JR Servos 
    Date:11/29/2003 10:31:19 AM Eastern Standard Time
    From:rcaerobob at cox.net
    Reply-to:discussion at nsrca.org
    To:discussion at nsrca.org
    Sent from the Internet 



    Wondering if anyone has used these?  What's your experience on JR servos?
    I have a couple that seem to not be seating fully down on the output shaft no matter how tight.  Almost as if something is stopping the arm from going on all the way.

    Any thoughts, insights?

    Bob Pastorello, Oklahoma
    NSRCA 199, AMA 46373
    rcaerobob at cox.net
    www.rcaerobats.net



  Bob are you talking about the heavy duty plastic arms? If that's what you are talking about, I had a similar experience as yours, with one arm not seating firmly all the way. The retaining screw was the standard short that came with earlier generation JR servos. 

  Didn't think that much about it since it was an aileron application. The good news is it was an aileron application, with its built-in servo redudancy which saved the plane possibly. Bad news is the output servo splined shaft tore off the servo.

  Two things: first, the short screw was a little too short and did not reach down far enough into the splined shaft. Second, The arms are thicker in the screw mount area and that exacerbated the problem. 

  If you use these, make sure that the retaining screws go far enough into the shaft. Better yet, toss the arm and refit another that fits AND use a longer retaining screw. The heavy duty arms are very robust and I will continue to use them (with extra care thgough)

  Matt K 
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