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Old 05-05-2004, 08:01 AM   #1
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Servo Binding?

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I have just installed two Hitec 635HB servos on my elevator. The question I have is they seem to hum when the controls are moved, and also when left at center? Any tips? I don't think they are binding. Surfaces move farther than what I need for max travel, and all seems free from excessive drag. Thanks for any help, Jared
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Old 05-06-2004, 06:40 AM   #2
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I have same experience with brand new 635HB as well! Will be interested to see coments but if we both are seein this it may be normal althought I don't know why. I haven't had a chance yet to connect a meter to the servo to see what the current draw is on the battery.
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Old 05-06-2004, 06:55 AM   #3
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My two new Hitec 635HBs are the same. They buzzed excessively when I first installed them. My pushrods were somewhat higher than the servo arm so I bent an slight s downwards on the pushrod-end to ease the stress on the servo. Now they are quiet at center but they do search a bit after moving and on occasion, they buzz on their own. They seem to be extremely sensitive.
If a little is good and more is better, too much is just right!

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Old 05-06-2004, 10:44 AM   #4
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Do they still buzz when you disconnect the control surfaces from them? If they don't then you have stiff or binding controls.

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Old 05-06-2004, 10:54 AM   #5
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Good question from Mike...

Here' s my approach...

Pop the arm off the servo in question and check centring. Add a little friction by squeezing the shaft with thumb and forefinger, any hunting? buzzing? If not, it's not the servo's fault.

Now check out the pushrod. Align it with where it will be with the arm on. Slide it back and forth feeling for tension. If you let go, does the pushrod want to move somewhere (other than drop due to gravity)? If yes, try to eliminate any binding.

There will always be some binding in a pushrod setup, especially in a new setup and if your control surfaces are not statically counterbalanced (servo has to fight gravity to keep the surface centred. The question is how much is too much. The simple answer (for me) is, is there significant current consumption due to binding. I keep a servo extension with an open lead for my ammeter for checking this out. Gives you a good idea how hard the servo is fighting the binding, and how much this will shorten your estimated flight time.

They seem to be extremely sensitive.
This is a good thing. I like servos centre accurately to the same location, and complain when they encounter binding preventing this.


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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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