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07-09-2015 10:55 AM | |
Arceenut |
Re: Servo locked up? Most servos have the output shaft connected directly to the feedback pot. Unless the relationship between the output shaft and the feedback pot is disturbed, it is not likely a stripped/broken gear driving the output will alter the neutral. The problem described can only be caused by the servo arm slipping on the output shaft or the feedback pot being moved on the out put shaft(unlikely) or a fault in the electronics (again not likely considering the servo works normally now). |
07-09-2015 09:53 AM | |
kip51035 |
Re: Servo locked up? You will probably find one of the plastic gears with a bent or missing tooth. New gears are available from the larger hobby shops. When buying new servos always go for the ones with metal gears, designated usually "MG" in the identifying code. There are also some with carbon fibre gears. Grab the output arm and gently move it in both directions from lock to lock. If it is smooth with no bumps or skips, it is probably ok. If you do this too violently you can bend one of those plastic gears. |
07-06-2015 07:53 PM | |
Midair |
Re: Servo locked up? I never considered that scenario, but your correct, perhaps the servo arm slipped on the spline. |
07-06-2015 06:31 PM | |
jsparky |
Re: Servo locked up? Have this buddy once.. still do.. but a throttle servo locked up on him one day.. he had to fly around at half throttle for about 30 to 40 minutes waiting for it to run out of gas.. wish I had been there.. Anyway he lands safe finally and swaps out the servo.. he wanted to take it apart and see if he could fix it.. I finally manage to get it from his hands.. And promptly took the side cutters to the lead and cut it off at the servo.. handed him back the lead and said that is the only thing I would keep.. and threw the servo in the garbage.. Is it worth it to risk your plane.. and alot more money than the servo is worth.. Toss the the dam thing... if it F**ked up once... it will likely do it again.. Only the next time you may not be so lucky to get your plane back.. |
07-06-2015 06:09 PM | |
Arceenut |
Re: Servo locked up? Make sure the servo arm and the servo is of the same manufacturer. Some servo arms from a different brand of servo may seem to fit but can cause slippage. The number of splines is not standard from brand to brand. |
07-03-2015 07:22 AM | |
deaconFlyer |
Re: Servo locked up? Check the servo over carefully, yes, but also don't forget to check the wiring all the way back to the receiver ... and then check the receiver as well. A friend of mine had what he thought was a persistent servo problem that turned out to be a fracture in the Y-harness. Everything worked great till in-flight vibration was factored in, then connections became spotty and the servo behaved erratically. Similarly, a pin can become loose right on the receiver board after a hard landing due to a poor solder joint. Get out your magnifying glass. The cost of servos is minimal compared to the cost of the plane, but swapping out a good servo for another good servo and then discovering the problem was in the cables and connectors ... oops! |
07-02-2015 03:00 PM | |
Midair |
Re: Servo locked up? I would take a very close look at the servo gear train for damaged or missing teeth and also the servo gear posts for cracks. A hard jolt could easily have cause the gear teeth to slip passed each other resulting in the servo arm appearing to be out of position. The same type of stress can cause the gear posts to crack at their base or attachment point forcing or allowing the gears to slip past each other. You may not even see the crack until pressure is applied to the post. Of what material are the gears made? Metal, nylon, carbonate? You didn't mention on what type of model the servo is mounted, but what you should consider - is the model worth loosing because of a $30 or $40 servo?, or worse, causing an accident? You might consider replacing the servo and using this one for a less critical function - doors, bomb release, etc. Even throttle is less critical than a control surface. Just a thought . One last thought, You may not have damaged the servo, but during the hard landing the servo may have been forced to its "dead spot" and so could not be electronically returned to it's normal operating range. For this reason you were able to return the servo manually and it again functioned. But, its a crap shoot . Peter |
07-02-2015 01:31 PM | |
chuebner |
Re: Servo locked up? I agree with Dave here....something does just not seem right with that servo. Simply repositioning the servo arm should not make the problem go away. If possible, change it out with the throttle servo (if it has one) if you insist on using it. Better yet, just change it out altogether until you can tear it apart and see whats wrong. Could be stripped gears. What servo brand and number and what kind of a plane is it on? |
07-02-2015 12:23 PM | |
HAL9KPCM |
Re: Servo locked up? Something sounds suspicious about that and I wouldn't trust it without looking deeper into the issue. I don't see how it could be deflected full over one direction and simply re-positioning the servo arm fixes the servo itself. |
07-02-2015 12:16 PM | |
manhoer |
Re: Servo locked up? Thanks hal9kpcm i pulled out the servo took of the thro lever or whatever it is called and centerd it on the spline and it works fine. |
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