How should servos be installed?
 

Hi.

I''ve seen a couple of different ways of installing a servo. What would you consider the best way to install the serve using the rubbers included? The way on the left with two rubbers on, or the way to the right with only one rubber on top? Or perhaps a totally different way?

RE: How should servos be installed?
 

i used 2 on each side. they are there why not use them all:)

RE: How should servos be installed?
 

My manual is not clear as to whether or not you need the rubber on both the bottom AND the top, but it does say never allow any part of the servo to come into contact with any part of the airplane structure, which means at least put the rubber on the bottom of the servo. Having the rubber on the top and the bottom can''t hurt.

RE: How should servos be installed?
 

That''s why I like the square ones that come with the HiTec Servos.

RE: How should servos be installed?
 

Generally the rubber is needed on both top and bottom. Go here; http://www.gettingairborne.com/radios.html for a good explanation and pictures of how to do it. It''s really very simple once you see how.

RE: How should servos be installed?
 

You want those rubber grommets on both sides ( upper and lower) of the mounting flang. There there for a reason.............shock and viberation protection. Just thing about it??? if you have them just on the top flang what protection do you have? none!!!. Most servos come with a brass eyelet to place into the holes. Make sure that the lip on the brass eyelet is on the bottom of the servo next to your mounting surface. Then tighten the screw down till it stops turning. Bang your set.

RE: How should servos be installed?
 

Rubber on top AND bottom

PS, you have the brass eyelets in upside down

RE: How should servos be installed?
 

I think in that picture you are looking at the square rubber mount. It needs a servo that has the slot in the mounting hole. I think that is what the picture is showing.

RE: How should servos be installed?
 

Well the one MinnFlyer is showing is not the square one. I humbly beg your forgiveness..

RE: How should servos be installed?
 

I just installed the rubber on the top of the servo (already had it on the bottom) and there really seems to be less chance for vibration, so I''m going with top and bottom.

RE: How should servos be installed?
 

No problem it does not matter. Top and bottom whether 1 piece or 2, see MinnFlyers post above.

RE: How should servos be installed?
 

I take it back, bottom only works for me! The holes in the rubber are too big for the screws that came with the servo; the metal grommet on the bottom has the right size flange to stop it from going through the bottom.

RE: How should servos be installed?
 

FatOrangeKat, Do NOT omit the top rubber.

Place one rubber on top and one on bottom. Push the brass eyelet up from the bottom (A jeweler''s screwdriver or other small tool is a big help here)

Then place the screw through the eyelet from the top as this picture shows (This picture shows a different type of rubber grommet, but you''ll get the idea

RE: How should servos be installed?
 

K.

RE: How should servos be installed?
 

What Minnflyer said. The rubber needs to be on the top and the bottom of the mounting flange. The other huge mistake that made quite often is that people will crank down the servo mounting screw as tight as they can. This is a sure fire way to servo failure. The screw needs to be tightened just to the top of the rubber grommet, and no further. This is done to ensure that the rubber grommets absorb vibrations from the airframe. If you over tighten it the rubber can no longer absorb the vibrations and they are then transfered directly to the servo, which will lead to servo failure.

Ken

RE: How should servos be installed?
 

I imagine from screwing and unscrewing the servo mounting screws that they are not holding as well as they could be, which is why I feel the need to crank down on them. Maybe I''ll try the next size (#4?) screw and not make it so tight?

RE: How should servos be installed?
 

If the screws are not holding in the wood well, just glue a toothpick into the holes and cut it off even with the wood.

RE: How should servos be installed?
 

If the screw holes are a bit loose you can also run some thin CA down into them. Give the CA PLENTY of time to cure and then re-insert the screws. This can help tighten up a loose screw hole. But trust me when I say to leave plenty of time for the CA to cure before putting the screw in. If you put the screw in with the CA still "wet" you will probably never get that screw out again. [:@]

Ken

RE: How should servos be installed?
 

Uh oh!

RE: How should servos be installed?
 

When you say not holding as they should and having to crank them down I have to caution.
After your servo is mounted you should be able to wiggle it slightly. It should never be so tight that it is rigid. That defeats the purpose of the shock absorbing rubber mounts.

RE: How should servos be installed?
 

Thanks guys.

RE: How should servos be installed?
 

Think of it this way - the engine, airplane, servo rails, servo screw and brass eyelet are all vibrating. The rubber insulates your servo from this vibration. There should be a rubber surface insulating the top, bottom and inside of the hole of the servo mounting lugs. Therefore you need one on the top, one on the bottom. To maximize the insulating qualities of the rubber pads, the screw needs to be snugged down until it just touches the top rubber pad without crushing it.

Ever seen the inside of a doorbell chime? The ding-dong type? You have 2 metal plates which must vibrate when struck by the hammer. In order to vibrate the plates must be isolated from the doorbell chassis. They use larger rubber grommets to separate the vibrating parts from the non vibrating parts. Rubber on the bottom, top and around the inside of the attachment holes.

RE: How should servos be installed?
 

Thanks for all the replys guys! You are all great help!

RE: How should servos be installed?
 

Most seem to follow the directions included with the radios for servo mounting, but I often see that people don''t install the servo correctly in the airframe. Since the servo's function is to push and pull, you need to align the long axis of the servo with the direction it is applying force. Otherwise, the servo tends to rock back and forth and the precision control is lost.

RE: How should servos be installed?
 

This is the way I was trying to describe in my post a ways back.