[NSRCA-discussion] Servo question

[Winston E Batchelor]

Heck I even remember having to build/assemble my Ace servos , transmitter
and receiver before it could be used.   Sorta like a HeathKit :-)
Eddie

----- Original Message ----- 
From: "Paul LaChance" <plachance at cox.net>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, July 05, 2008 7:12 PM
Subject: Re: [NSRCA-discussion] Servo question


> I also remember regular maintenance involoved re-lubing the pots.  Used to
> get pot lube that was in a little capsule like a pill capsure.  LOL  Man
we
> had to work hard those days to keep stuff working.
>
> Paul
> ----- Original Message ----- 
> From: "Ron Van Putte" <vanputte at cox.net>
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
> Sent: Saturday, July 05, 2008 7:57 PM
> Subject: Re: [NSRCA-discussion] Servo question
>
>
> > And the Giezendanner special pot wipers we imported from Switzerland  to
> > make them last longer.  I long for those good old times NOT.
> >
> > Ron VP
> >
> > On Jul 5, 2008, at 6:44 PM, <glmiller3 at suddenlink.net> wrote:
> >
> >> Ah, Jon,
> >>
> >> I remember changing my servo pots every 30-50 flights as a routine
> >> maintenance procedure....with the old Kraft Signature set.<G>
> >>
> >> G
> >> ---- Jon Lowe <jonlowe at aol.com> wrote:
> >>
> >> =============
> >>
> >>  3421's have the pot shaft driven directly by the output shaft.? If
you
> >> reach down thru the hole for the servo arm screw with a  jewelers
> >> screwdriver, there is a slot that can be used to adjust  centering of
the
> >> pot which is a press fit into the gear.? The pot  shaft may have
slipped
> >> in the output gear.? Pot shaft could be  binding, or the output gear
may
> >> be cracked internally allowing the  shaft to slip. You could just need
a
> >> new output gear.? I'd try  adjusting it to see how easy it slips.? A
VERY
> >> small movement of  the pot shaft will affect centering in a BIG way, so
> >> be careful.?  Perhaps, the pot may also be coming apart or wearing
badly
> >> internally, affecting centering.? Definitely determine the cause or
send
> >> it back to have at least the pot replaced, along with the gears.
> >>
> >> Years ago, many servo pots were driven like this, and didn't caouse  a
> >> problem except for servo pot wear.? Replacing pots after 25  flights
was
> >> not all that uncommon.? Most (all) larger servo pots  anymore are
> >> indirect drive to help prevent pot wear.? 3421 is  probably just too
> >> small to do an indirect drive.
> >>
> >>
> >>
> >>
> >>
> >> Jon Lowe
> >>
> >>
> >>
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: chris moon <cjm767driver at hotmail.com>
> >> To: nsrca-discussion at lists.nsrca.org
> >> Sent: Sat, 5 Jul 2008 12:47 pm
> >> Subject: [NSRCA-discussion] Servo question
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Ok, here is a brain teaser for you experts.
> >>
> >> On Sunday 2 weeks ago I went out flying maybe 4-5 flights. All was
> >> fine.  When I got to the flying site on Friday for the Lake City
> >> contest, I made a practice flight and the plane was climbing like mad.
> >> I got it down and found that 1 of the elevator halves was about  3/8"
up
> >> from the other.  Before the flight, I checked the operation of the
> >> elevators and they were moving correctly but I don't remember
> >> specifically if I paid any attention to if they were centered
> >> perfectly.  Now, nothing was changed between the the last time I flew
> >> and this flight.  The transmitter was on the right model.  The linkage
> >> had not slipped, nor had the control horn bent.  The control surface
> >> showed no sign of trauma from a severe bump possibly causing a
stripped
> >> gear.  The servo (JR 3421sa) was functioning 100% normally it was just
> >> the center had changed on it's own.  I removed the servo arm (alum  -
not
> >> stripped either) and moved it one spline and adjusted the sub trim
> >> slightly and flew a few test flights and the contest with no problems.
> >> Now at home, I removed the servo to send it back and inspected it and
> >> found nothing abnormal.  The gears all look fine. Here is what I have
> >> eliminated:
> >>
> >> servo arm - not stripped
> >> servo gears - not stripped
> >> pushrod and linkage - no play and not slipped on the clevis threads
> >> transmitter - correct model selected and could not be elevator pot in
> >> transmitter since it did not affect the other elevator servo's
centering
> >>
> >> I am sending it back for a check up but just was wondering if  anyone
has
> >> had any similar experience ever or if they have any possible causes.
> >>
> >> Thanks
> >>
> >> Chris
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Making the world a better place one message at a time. Check out  the
i'm
> >> Talkathon.=
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
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> >>
> >>
> >>
> >>
> >>
> >>
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