Servo Query

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Servo Query

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25 May 2020 at 15:40 #88396
Chris Fellows
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@chrisfellows72943
Hi All

Just fabricating the mounts for the rudder servos. For the Huntsman 28 I'm using this Hitec Low-Profile servo as height under the cockpit floor is restricted.

As well as the usual different arms and the four screws there are four rubber whatsits and four metal sleeves. I'm assuming that the former are rubber mountings, though they are a tight fit in the servo mounting holes. Are these for aircraft use?

I've had a look on the Hitec site and downloaded a "manual" but there is no mention of these parts.

Usual practise seems to be just to use screws but do I use the sleeves as well or are those for the rubber mounts?

Thanks, Chris

PS There are four sleeves but one decided to throw itself in the corner behind the units! I can see the blighter though, surprisingly!

Edited By Chris Fellows on 25/05/2020 15:43:04
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25 May 2020 at 15:40 #2924
Chris Fellows
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@chrisfellows72943
25 May 2020 at 16:06 #88398
Dave Smith 17
Participant
@davesmith17
The rubber grommets are to dampen vibration when the servo is being used in an engine powered plane or boat, the correct use of them is to push the grommet home on the servo lug, then slide the metal tube through from underneath so the flange is against whatever the servo is being mounted on. This prevents the screw from putting too much pressure on the grommet.

I doubt that the vibration resistance is needed in most scale type boats, but I still mount them that way out of habit.
25 May 2020 at 16:40 #88400
Dave Milbourn
Participant
@davemilbourn48782
Chris

This should explain it, although you needn't go as far as to make a special tool for the job. I use an old school compass…

Servo mounting grommets

Dave M
25 May 2020 at 18:28 #88401
Chris Fellows
Participant
@chrisfellows72943
Thanks chaps

It all makes sense now!

Mr. Milbourn, do you actually use them? The servo in the Huntress is just screwed in as it is in the Club 500 which gets more abuse as it's used for racing and no problems.

When I say the grommets are tight, they are very tight and very hard to push all the way home. Some oil would help I suppose.

Chris

Edit: with the aid of soft soap I've got them in Ok and the eyelets went in alright by hand. As I've got them I may as well use them.

Edited By Chris Fellows on 25/05/2020 18:39:25
25 May 2020 at 18:58 #88402
ashley needham
Participant
@ashleyneedham69188
For I/c use I can see that rubber grommets might be necessary, but for anything else?? I just screw mine in. Early on I just had them sitting in a closely fitting box! No probs.

Ashley
25 May 2020 at 19:26 #88403
Ray Wood 3
Participant
@raywood3
Hi Chris,

I think they they are worth using, just looks a better job !I

The eyelets are really useful for loads of things when you build a yacht 😄

Regards Ray
25 May 2020 at 19:37 #88404
Dave Milbourn
Participant
@davemilbourn48782
Mr. Milbourn, do you actually use them? The servo in the Huntress is just screwed in as it is in the Club 500 which gets more abuse as it's used for racing and no problems.

Mr Fellows

You have that particular model. I built it several years ago and so I can't remember whether or not I used the brass eyelets in it. However the original question wasn't related to my own use of them – you asked it and I posted what I'd hoped was a helpful reply. That said, I've been making these things for over 50 years and I don't need to rely on spacers to indicate whether or not the servo screws are overtight.

Suit yourself.

DM
25 May 2020 at 22:15 #88409
Chris Fellows
Participant
@chrisfellows72943
Hi Dave

Sorry, I didn't mean it to come over like that, just wondered if you ever used them at all?

As ever, your reply was very useful and told me exactly what I wanted to know.

It was just funny after looking at that special tool, that after I'd got the grommets in the eyelets went in a treat.

Chris
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