Solidly Mounted Servos

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Jim Allen

Jim Allen

Well-Known Member
Joined
Jun 7, 2005
Messages
1,622
Does the solid mounting of servos shorten their operating life? These are Hitec D956WP servos in an aluminum mount. No rubber grommets are used.

Jim Allen
 

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It would depend on the vibration. I know in my helis I don’t put grommets but there is no vibration and the grommets would allow the servo to move making the geometry 100% off.
 
warlokboats said:
It would depend on the vibration. I know in my helis I don’t put grommets but there is no vibration and the grommets would allow the servo to move making the geometry 100% off.
Click to expand...
ON aboat YES it will shorten the life of the servo, Most airplane people use the moments and only tighten down the screws on the servo grommets just enought so the servo does not move or moves ever so slightly so as not to be noticeable when in use
Walt Barney
 
This is the problem with servos. Too tight and they die while too loose and the whole vehicle dies.
When I build a boat or plane, I won't install a servo without the grommet and metal sleeve in all the mounts. I figure it's going to take a beating either way so it might as well be secure:confused:
 
JIm, I know you using those for your trim tabs. There is going to be a lot of load on those. Your going to need those to not move. Just a little bit of movement will show up in the trim. Not good.
It will be worth the failure rate.
Mike
 
Mike,

I'll have to look at this carefully & give it more thought. All the servos I have mounted thus far have used the grommets, eyelets, washers on top of the grommets & screws that fitted inside the eyelets. I probably will continue to do this even though it is more work. Most of the newer servos require 3-48 screws to fit the eyelets properly & they use "molded" grommets. There is very little movement with either the older type grommets, eyelets, washers & fitted screws or the newer types.

Jim
 

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maybe the question is.. in nitro or gas boating.. why would you not vibration isolate the servos?

Whats the down fall? Do we feel the isolation is causing a handling issue? Do we not like the Hassle of installing the rubber and grommet?

I really dont understand not using them..

I also do not use them in my Electric Helicopters and boats BUT DO in my my Nitro versions...

Grim
 
Ribbed vibration-damping grommets used on engine mounts AND servos...NO more problems.
From McMaster Carr
 
Mark Anderson said:
I have servos with hundreds of runs on them solidly mounted. Is it best practices, probably not, but in tight layed down installations it is necessary.
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Mark,

If you're talking about boats, are these nitro, gas or electric boats & what types of engine mounts do they have?

Jim Allen
 
i slot a block to fit the grommets in a laydown install.

Not hard to do.. use servo tape above on the capture lid to the servo to keep it from fulling seating in the mount.

Grim
 
I’ve had success with ridged mounted servos in many applications. My experience tells me (not scientific) that many issues with servos mounted solid were blamed on vibration when it was probably a bad mount to begin with, out of parallel or out of square and the case would bind when mounted ridged.
Thanks John
 
John,

Was your experience obtained with wood hulls, fiberglass hulls, carbon fiber hulls, or some combination of these. I wonder if, or how, the modern day use of a machined aluminum case effects this.

Thanks,

Jim Allen
 
I’ve always mounted mine solid Layed flat against the radio box. I’ve never had any issues. It’s been in a Sport 40 and Sport 20. Fiberglass hulls and wooded radio box.
 
Jim Allen said:
John,

Was your experience obtained with wood hulls, fiberglass hulls, carbon fiber hulls, or some combination of these. I wonder if, or how, the modern day use of a machined aluminum case effects this.

Thanks,

Jim Allen
Click to expand...
Jim all of the above, the machined aluminum will be even better as long as both ends and flat and parallel, that’s the key as far as I’m concerned. No matter of the case material, as long as it doesn’t twist you should be just fine.
Thanks John
 

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