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02-05-2008 09:25 PM  10 years agoPost 1
Carljw

rrNovice

Pittsburgh

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I replaced the gears in one of my servos and I tried to turn the servo arm and it will not go all the way around. It only moves about 90 degres. Is this normal or should it turn with out stoping.
Carl

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02-05-2008 11:57 PM  10 years agoPost 2
nappyroots2182

rrElite Veteran

Moline, il

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a servo does only move 90 degrees. you should be fine.

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02-06-2008 01:28 PM  10 years agoPost 3
stickyfox

rrKey Veteran

Rochester, NY - US

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90 degrees is the normal travel, but you have to be careful about one thing when you replace the gears. There is one gear (the output I think) that is molded with stops that prevent it from turning all the way around. The actual limit is much more than 90 degrees, but you have to make sure it's at least near the center of travel, or your servo will bind at one end. This can be hard to distinguish from normal behavior, and it'll eventually ruin the servo and possibly your ESC as well.

What I usually do is assemble the servo with the output gear centered, then attach a horn and power the servo up with a 50% signal. If the horn only moves a little bit, then everything's fine; I put the screws in and fly it. If it moves more than 30-40 degrees, I pop the case off, re-center the gear, and repeat until it's near the center. It's a little weird to imagine but if you just rebuilt your servo you probably know what I'm talking about. A servo tester helps, but when it comes down to it, you're flying the thing with your radio system; so that's the best thing to test your servos with.

-fox

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02-06-2008 04:05 PM  10 years agoPost 4
tutelar-rc

rrKey Veteran

Nobleton, Ontario - Canada

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I do something similar to stickyfox...

This is my procedure:
  • I put all the gears in except the last gear (output gear - the output gear is mounted directly onto the potentiometer that signals servo arm location).
  • Then I power up the servo and move the potentiometer by hand until the servo gears stop moving (or almost stop moving).
  • I then power down the system and install the output gear with it "centered" and install the top of the case.
Keep in mind that the stop on the output gear has to be oriented so it is over top of the other gears when it is "centered".

Happy Flying!

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02-07-2008 05:35 AM  10 years agoPost 5
Micro-Maniac

rrElite Veteran

Pasco,Washington Formerly: Captain Chaos

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Guys the potentiometer shaft that the output gear attaches to is flat-sided so the gear will only go on one way and the potentiometer shaft only rotates about 90° - Look for the flat side inside the gear and match it to the flat side of the shaft as it might be possible to force it on wrong

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02-07-2008 05:43 AM  10 years agoPost 6
tutelar-rc

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Nobleton, Ontario - Canada

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Oh yeah - forgot about that. Please ignore previous advice...

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