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Old May 07, 2012, 11:24 PM
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Jury rig a servo to test//need help ASAP

is there any way to test a servo without all the other gear?

Like straight to a battery just to check the throw, etc.
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Old May 07, 2012, 11:42 PM
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Short answer is yes, the question is whether or not it will do permanent damage. If that can not be answered then it would be best to just wait until you have the other gear, you could also take it to your local hobby shop, most likely they can and will hook it up to make sure it operates for you. I've not been in a hobby store yet that would charge for something like that either.
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Old May 08, 2012, 12:30 AM
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You cannot run a servo just by hooking it up to a battery. You need a PWM signal to control it.

A cheap servo tester will do the job. You can get them straight from China on eBay for like $3. It'll generate the PWM signal you need to run the servo... But coming from China, it might take more time than you have.

What are you trying to do? There might be another way of accomplishing it if you can tell us what the problem is.
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Old May 08, 2012, 02:50 AM
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Learner/nug

The one I am worried about controls the rudder and nose steering. by hand turning the arm it seems the servo will turn 180 degrees. Just basic lack of knowledge in the early morning hours.
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Old May 08, 2012, 03:33 AM
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Quote:
Originally Posted by dedStik View Post
Short answer is yes, the question is whether or not it will do permanent damage. If that can not be answered then it would be best to just wait until you have the other gear, you could also take it to your local hobby shop, most likely they can and will hook it up to make sure it operates for you. I've not been in a hobby store yet that would charge for something like that either.
Not sure how you think he can test a servo by connecting it to a battery exactly... You need at least a servo tester. I have this one, it is cheap, and works great: http://www.hobbyking.com/hobbyking/s...idProduct=8296
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Old May 08, 2012, 08:04 AM
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And DO NOT turn a servo by hand!!! You can easily strip out the gears inside it by doing so.
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Old May 08, 2012, 09:52 AM
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dedStik's Avatar
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Originally Posted by NFA Fabrication View Post
Not sure how you think he can test a servo by connecting it to a battery exactly... You need at least a servo tester. I have this one, it is cheap, and works great: http://www.hobbyking.com/hobbyking/s...idProduct=8296
Also mentioned taking it to his lhs for testing, 1 month delivery vs a car ride. And yes you can test a servo using batteries, I've always done it that way with analogs.

This is what I've used,
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Old May 08, 2012, 10:19 AM
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Quote:
Originally Posted by winggunner46 View Post
The one I am worried about controls the rudder and nose steering. by hand turning the arm it seems the servo will turn 180 degrees. Just basic lack of knowledge in the early morning hours.
That is normal. All servos are able to turn much farther mechanically than the electrical input will command them. Even though the servo is capable of turning almost 180 degrees, the electrical control input will typically turn it only about 38 degrees in each direction.

And yes, it is not a good idea to turn a servo by hand. Doing so can easily strip the gears.

Larry
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Old May 08, 2012, 10:20 AM
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Originally Posted by dedStik View Post
And yes you can test a servo using batteries, I've always done it that way with analogs.

This is what I've used,
That is one strange looking battery.

Larry
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Old May 08, 2012, 10:36 AM
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Not just a battery, but much much safer.
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Old May 08, 2012, 05:11 PM
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C₄H₁₀'s Avatar
United States, AK, Fairbanks
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Let's toss caution to the wind for a moment. Show us how you can test a servo by connecting it straight to a battery
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Old May 09, 2012, 12:39 AM
Mark Harrison
USA, CA, Piedmont
Joined Jun 2010
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Quote:
Originally Posted by NFA Fabrication View Post
Not sure how you think he can test a servo by connecting it to a battery exactly... You need at least a servo tester. I have this one, it is cheap, and works great: http://www.hobbyking.com/hobbyking/s...idProduct=8296
+1, I have one and it works great.

Dale Kramer, who designed the Lazair ultralight in the Smithsonian, agrees and uses it for the motor control of his Electric Lazair!

http://www.rcgroups.com/forums/showp...4&postcount=79
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Old May 09, 2012, 12:49 AM
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Quote:
Originally Posted by winggunner46 View Post
is there any way to test a servo without all the other gear?

Like straight to a battery just to check the throw, etc.
Yes and the easiest way is to have a Servo Tester and a battery holder with 4 NiMH rechargeables in .... or an old LiPo you don't use for flying and an ESC / BEC ...

Servo Tester (Hobby Kings - I use this and it's very good) :

http://www.hobbyking.com/hobbyking/s...vo_Tester.html

and a simple battery holder + 4 supermarket NiMH batts in, from local shop with a lead from a dead servo.

The other possibility is where i bought an RTF model and later replaced the radio gear. That now sits on my bench as a testing set-up. Just because you don't want to fly with it doesn't mean it's no use ....
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