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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › brass eyelets in rubber servo grommetts
03-31-2009 02:00 AM  9 years agoPost 1
love for scale

rrVeteran

Omaha, Nebraska U.S.A.

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for the love of pete, does it really matter which way they go into the rubber grommett!!!! heard so many different stories!

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03-31-2009 02:02 AM  9 years agoPost 2
george0079

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USA

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The flange should go toward the head of the screw

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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03-31-2009 02:04 AM  9 years agoPost 3
love for scale

rrVeteran

Omaha, Nebraska U.S.A.

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thanks, thats how i do it, the JR manual shows the opposite.

greg

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03-31-2009 02:10 AM  9 years agoPost 4
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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The flange should go toward the head of the screw
Always.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-31-2009 02:10 AM  9 years agoPost 5
baddynergy

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sierra madre, ca- usa

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The flange should go toward the head of the screw
Should go flange away from screw. Just like JR shows it.

**Unattended children will be givin a shot of espresso and a puppy**

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03-31-2009 02:11 AM  9 years agoPost 6
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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The flange should go toward the head of the screw
Should go flange away from screw. Just like JR shows it.
Sorry, not true. The purpose of the eyelet's flange is to allow the servo screws to be firmly tightened without over-compressing the rubber grommets, which would defeat their intended vibration-dampening, shock-reducing design.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-31-2009 02:36 AM  9 years agoPost 7
love for scale

rrVeteran

Omaha, Nebraska U.S.A.

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i fly vario, if the flange is away from the the screw, the flange touches the sero tray, and the rubber grommett does not com into contact with the servo tray. thus, how can the rubber grommett do its job?

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03-31-2009 02:41 AM  9 years agoPost 8
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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if the flange is away from the the screw, the flange touches the sero tray, and the rubber grommett does not com into contact with the servo tray. thus, how can the rubber grommett do its job?
Zactly. If eyelets and grommets are used, the eyelet's flanges should always be closest to the head of the servo screws for the reasons mentioned.

However some 3D pilots use neither eyelets nor grommets -- the idea being that they end up with minimum possible 'slop' in their control linkages -- but they pay a price in MUCH more frequent servo failure due to vibration and lack of shock absorption in even minor crashes.

But if you're competing in 3D at the top of the game, servo longevity may not be your biggest concern.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-31-2009 04:10 AM  9 years agoPost 9
baddynergy

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sierra madre, ca- usa

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Sorry, not true. The purpose of the eyelet's flange is to allow the servo screws to be firmly tightened without over-compressing the rubber grommets, which would defeat their intended vibration-dampening, shock-reducing design
I do disagree with the flange side. The reason they are there is right though. Maybe on helis you can get away with it though. But in planes if you put the flange towards the screw, the other end will be severly pushed into the balsa rendering it almost useless.

**Unattended children will be givin a shot of espresso and a puppy**

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03-31-2009 04:15 AM  9 years agoPost 10
windy62

rrApprentice

USA

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The flange of the brass bushing should be against the structure of the aircraft, The screw head will contact the opposite side or non flanged side of the bushing, preventing the rubber grommet from becoming TOO compressed.

windy62

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03-31-2009 04:20 AM  9 years agoPost 11
Quandumphone

rrApprentice

Yuma, AZ

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Flange away from screw or don't even bother putting them in.

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03-31-2009 04:22 AM  9 years agoPost 12
Dood

rrProfessor

Wescanson

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Sorry, not true. The purpose of the eyelet's flange is to allow the servo screws to be firmly tightened without over-compressing the rubber grommets, which would defeat their intended vibration-dampening, shock-reducing design.
Wrong!

The non-flanged (sharp) side of the eyelet is equally as capable as the flanged side in preventing screws from being over tightened.

(I promise you the screw can't feel the difference!)

And as baddraptor said, the purpose of the flange is to prevent the eyelet from digging into a soft mounting area, i.e; balsa, plastic.

Regardless of the way the flange is positioned, when using an eyelet in conjunction with the rubber grommet, the servo will always be "floating" (HINT: notice how the eyelet NEVER makes contact with the servo?)

George0079, not to leave you out, a big Wrong! for you too. There is no reason to ever have the flange contact the screw head.

  ▲
▲ ▲

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03-31-2009 04:35 AM  9 years agoPost 13
scrape

rrNovice

USA

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That's the side I put it on.

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03-31-2009 04:49 AM  9 years agoPost 14
Parsifal

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Singapore

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Sorry mate, flange should be at the frame end of things, not under the screw. Dood is exactly right

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03-31-2009 06:05 AM  9 years agoPost 15
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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in planes if you put the flange towards the screw, the other end will be severly pushed into the balsa rendering it almost useless.
Balsa installations are indeed a different story. I assumed we were talking about helis.
Sorry, not true. The purpose of the eyelet's flange is to allow the servo screws to be firmly tightened without over-compressing the rubber grommets, which would defeat their intended vibration-dampening, shock-reducing design.
Wrong!
Wrong!

I'll grant that eyelets oriented either way will limit a screw's travel, but notice if you will that MOST servo screws' heads are significantly smaller in diameter than the flange on the eyelet, and therefore do not as firmly compress the rubber grommet, and therefore do not optimize the grommet's function.

In addition, turning a screw's head into the rubber will at least momentarily distort (and possibly damage) the rubber grommet. An eyelet's flange (placed outward) prevents this. A servo screw plate at each end of the servo will also eliminate this conflict, but not all servos use them nor come with them.

With those exceptions, my assessment of ideal eyelet installation is correct, and I'll stand by it as will the majority of folks I've flown with -- and I'll wager the price of a shlub shlammich and a Grolsch that a majority here will agree.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-31-2009 12:57 PM  9 years agoPost 16
baddynergy

rrElite Veteran

sierra madre, ca- usa

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I assumed we were talking about helis.
We are, would the same logic not apply to both?? The eyelet will still cut a circle into the plastic or carbon frames.
but notice if you will that MOST servo screws' heads are significantly smaller in diameter than the flange on the eyelet, and therefore do not as firmly compress the rubber grommet, and therefore do not optimize the grommet's function.
I have not seen a servo yet that did not come with the appropriate screw.

**Unattended children will be givin a shot of espresso and a puppy**

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03-31-2009 01:28 PM  9 years agoPost 17
T-Rex-Flyer

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Panama City, Fl

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Bottom line, The brass eyelets are used to prevent the compression of the gourmet's. That said, you also don't want the non flanged end of the eyelet to cut into a plastic or whatever type of servo mount you're using.. Uses some commonsense with you're installation, it's not rocket science.

My two cents.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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03-31-2009 06:49 PM  9 years agoPost 18
scrape

rrNovice

USA

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Who has commonsense? Can you get it online?

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03-31-2009 08:56 PM  9 years agoPost 19
fiveoboy01

rrVeteran

Waunakee, WI - USA

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With those exceptions, my assessment of ideal eyelet installation is correct, and I'll stand by it as will the majority of folks I've flown with -- and I'll wager the price of a shlub shlammich and a Grolsch that a majority here will agree.
Wrong...

The majority isn't always correct, and neither are YOU.

This directly from Futaba's website:

Proper Servo Mounting:

The proper way to mount a servo is as follows:

1. Insert a rubber grommet into each of the four servo holes.
2. Insert a metal eyelet from the bottom side of the rubber grommet. This way the wide portion of the eyelet will be in contact with the servo tray when mounted.
3. Test fit the servo in the tray, and enlarge the openings so the servo will not touch the tray. The rubber grommets will isolate the servo from the hard vibration of the airplane's structure.
4. Position the servo, then mark the location of the mounting holes. Drill pilot holes with a 1/16" bit at each mark.
5. Use the servo screws supplied with your radio to mount the servo(s) in the servo tray. Tighten the screws until they just touch the top of the metal eyelet.

Mikado Logo 400, hopefully ready by spring.

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03-31-2009 10:08 PM  9 years agoPost 20
Heli 770

rrProfessor

USA.

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I insert from the bottom and the servo mount plate on top.

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › brass eyelets in rubber servo grommetts
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