Servos

[Henderson,Eric]

The  9411 is a different gear design to the 84 series on the output haft. The bottom one defeated me after very trick and tool that I used and made. It was better to buy some new bearings...

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of rcaerobob at cox.net
Sent: Wednesday, February 04, 2004 1:14 PM
To: discussion at nsrca.org
Cc: rcaerobob at cox.net
Subject: Re: RE: Servos


I"ve done 5 8411's metal gears, converted to "SA"s and on each, removed the bearing from the metal gear.  It's tight, but doable with GENTLE heating JUST the shaft/teeth of the metal gear. Heat it rapidly, after it's removed, and the bearing will almost just drop out..  The bearing is a pretty tight fit on the replacement Nylon output gear (or whatever it's made of), but it permits the drive train to be nearly all non-metal.

Mine have been working fine so far, lots of use after conversion.
> 
> From: "Henderson,Eric" <Eric.Henderson at gartner.com>
> Date: 2004/02/04 Wed PM 01:06:45 EST
> To: <discussion at nsrca.org>
> Subject: RE: Servos
> 
> I remember that the reason you left the metal output shaft in place is that you can't get the bearing out of the bottom of the gear. Does the 9411 SA version come with a plastic output shaft?  It is not shown on the Horizon site.
>  
> Also, is Troy back on the list. I only see his posts if someone lese replies to one and includes his notes.
>  
> Regards,
>  
> Eric.
>  
>  
> -----Original Message-----
> From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Nat Penton
> Sent: Wednesday, February 04, 2004 12:45 PM
> To: discussion at nsrca.org
> Subject: Re: Servos
> 
> 
> On one servo I replaced all but the motor gear with the returned metal gears and ,like Troy says, it was somewhat difficult replacing the servo arm gear and, Jerry, everything "feels" ok. The two smaller intermediate gears had missing outer teeth. The other servo I replaced all but the motor and servo arm gears with the returned metal gears and , Jerry, it feels super . The inner gear on one of the intermediate gears was missing a tooth or two. It seems to me this is the logical way to go on future conversions and I believe this is what Troy said.
> 
> ----- Original Message ----- 
> From: Troy Newman <mailto:troy_newman at msn.com>  
> To: discussion at nsrca.org 
> Sent: Tuesday, February 03, 2004 10:09 PM
> Subject: Re: Servos
> 
> Nat,
>  
> The conversion is to leave the metal output gear in place. So the gear that the servo wheel attaches too is still metal all other gears are nylon. And the standard servo comes with a Nylon gear off the motor already and this gear is left in place.
>  
> I have been running these servos converted for 2+ years now and I have tons of flights on them...We are talking over 2000 flights on these servos converts....Lots of snaps and lots of abuse.
>  
> I have never had a gear strip in the setup....Servo pots wear but not a gear go bad...I don't think you can convert the output gear easily to nylon because of the way it is attached to the pot and the bearing. I'm sure you can get the bearing off the shaft on the output gear and then it might work out..I also will add a little white grease like the servos use...Also in a  pinch I have used petroleum jelly too....Probably not the best choice but it worked.
>  
>  
> My question is what gear(s) stripped?
>  
> I am very curious as I have had nothing but superb luck with this setup. My opinion this is the absolute best aileron servo setup I have ever used. They are fast strong and light just over 1.25oz each.
>  
> Let me know if I can help you out.
>  
> My email offline is 
>  
> troy_newman at msn.com
>  
>  
> Regards,
>  
> Troy
> 
> ----- Original Message ----- 
> From: Nat  <mailto:natpenton at centurytel.net> Penton 
> To: discussion at nsrca.org 
> Sent: Tuesday, February 03, 2004 8:28 PM
> Subject: Servos
> 
> I had two DS9411's coverted to SA . A gear , or gears, stripped in both with relatively no torque by hand. They could have easily crashed an airplane. Does  the stock SA have all plastic gears, or only one or two ? These were converted to all plastic.
> 
> 
> 

Bob Pastorello, El Reno, OK, USA
rcaerobob at cox.net
www.rcaerobats.net
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