Techniques > Misc

Servos, is it me?

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Ron:
Hi All,

Is it me being fussy...?
I'm in the process of fitting a couple of aileron servos.
As normal, you plug them into the RX and make sure you've got them centred before fitting the nylon lever thingy so that is centred as well.

Now these two servos are different, even when plugged into the same RX output to centre them, with all controls and trims centred.
One servo you can fit the output lever exactly at 90 degrees to the servo, but with the other servo it's either just one way or just the other, only moving it one 'cog' on the splined output shaft at a time.

I've tried different nylon levers with no difference, as you would expect.

This is annoying as it means the trims on the transmitter have to be always off centre, or set up the push rods to compensate, but this will give different control surface movement at the extremes of travel.

This isn't the first time. I have other servos that are the same 'off centre'.

So is it just me being picky? Do servos all vary like this?
Should I just bung it together and stop moaning? :oops:

Ron

Fred:
Hi Ron,
yep, that happen to me as well with different brand of servos...
I don't know why, that might be the way they mount the last gear in the factory. Maybe not well centered or so.. But sometimes I have 1 "notch" (?) difference between 2 same servos  :?:  Not all the time, but that happen...

Not a big issue anyway with the new radios full of processor thingy gadget, but I remember in my early days, that was more of a problem !  :wink:  :!:

Ron:
Hi Fred,

Yes the engineer in me makes me want to take the servo apart and move a gear around one tooth to get it centred.
Don't think I'll be doing that as I've no idea what I'll find.

It's just a bit irritating really.
I start looking up which way I want more movement and which less to try to bias the servo output one way or the other.

Just me being fussy :lol:

What we really need is fully adjustable output arms, that can be clamped in the right position.

Ron.

Fred:
:D  True.
A brand use to make servos with servos arms you can adjust in any position with a screw... Was a good idea ! Can't remember who that was  :?:

I still have one very old servo.. the last gear is square ! So you can move the arm only90 degrees at the time... Nightmare !  :!:

Ron:
90 degrees only :shock:
Horror.

Just thinking aloud here now (waiting for the rain to stop so we can take the visitors out).
But if you had a 'sleeve' type bit that fitted on the servo output splines, with a sort of threaded groove around the outside, so that the arm itself fitted over it with a grub screw in it like a worm gear.
Then you could adjust the 'worm' and swing the arm.

Hmmmm...

Ron

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