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Mini servos

Old 02-11-2015, 11:45 PM
  #1  
tolona
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Default Mini servos

My cheap chi com servos start twitching and moving as soon as i plug in the rec. Sometimes they will settle down when i turn on the radio. But then when I turn off the radio they will start in again with the twitching. How is this possible? Obviously they are getting power thru the rec. (airtronics vg 6000) steve from IL ps the AT servos that came with the radio do not do this..
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Old 02-11-2015, 11:54 PM
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gramps2361
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Tolona turn on your radio first then plug your RX battery. When your done flying unplug the rx battery then shut off your radio. See if this helps out.
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Old 02-12-2015, 02:30 PM
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tolona
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Doc, thanks, this solved the glitching problem. But then i found that the elevator servo had failed completely with up input causing my plane to pitch straight up, stall, then nose in. this is a balsa plane so.... quite a bit of nose damage. These servos are EMax brand 9 gram. Does anyone have any experience with the clear blue TowerPro brand?'
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Old 02-12-2015, 04:48 PM
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I've got probably 60 of those. I'd say 5% or so fail or jitter, usually right away. I "exercise" the servos for 15 minutes or so when I get them. I have TX that allows a program to cycle them slowly automatically. At $3 a piece it's easier to just toss the bad ones after saving the gears (they will break in a crash.)
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Old 02-12-2015, 05:11 PM
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Originally Posted by tolona View Post
Doc, thanks, this solved the glitching problem. But then i found that the elevator servo had failed completely with up input causing my plane to pitch straight up, stall, then nose in. this is a balsa plane so.... quite a bit of nose damage. These servos are EMax brand 9 gram. Does anyone have any experience with the clear blue TowerPro brand?'
Can't go wrong with Hitec servos.

I've had issues with every one of the cheap off brands. A $3 servo that costs you an airplane wasn't really cheap.
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Old 02-12-2015, 05:45 PM
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Sir Crash-A-Lot
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Originally Posted by tolona View Post
These servos are EMax brand 9 gram.
I have been using those servos for years without any issues. I also sold them for several years before I went out of business last year and everyone always had very positive feedback on the Emax servos.

It is possible by plugging in the battery first you did some damage to the servo from the uncontrolled inputs they were receiving. Or it was just a bad servo, every company has a few. I sold several thousand of them and only had 3 or 4 returned.

Mike
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Old 02-12-2015, 08:49 PM
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solentlife
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Originally Posted by pmullen503 View Post
I've got probably 60 of those. I'd say 5% or so fail or jitter, usually right away. I "exercise" the servos for 15 minutes or so when I get them. I have TX that allows a program to cycle them slowly automatically. At $3 a piece it's easier to just toss the bad ones after saving the gears (they will break in a crash.)
I have a cheap Hobby King servo tester cost about 7$ .... and with bags of cheap 3$ servos etc. - only had one or two ever fail .....
I've now changed to Tg9 metal gear from HK at just over 3$ and found them very good.

To OP - various servos will jitter or muck about if no signal from Tx - its usually the Rx hunting not the servo. It has no reference signal to set the servo to.

Nigel
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Old 02-13-2015, 12:53 AM
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I had a brand new emax 9 gram MG servo dead on arrival. When I contacted the seller I had to ship it back on my dime so they could test it. Then they would decide if it was bad or not. Never did business with them again a USA company. I have a few more of them and they have worked fine. Again you get what you pay for.
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Old 02-13-2015, 04:06 PM
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tolona
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I am OP.. i took that bad EMax servo apart and i noticed some tiny plastic crumbs inside the case. Put it back together and it seems to work ok.. Maybe one of those little particles jammed up the gears....
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Old 02-13-2015, 04:30 PM
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Originally Posted by tolona View Post
I am OP.. i took that bad EMax servo apart and i noticed some tiny plastic crumbs inside the case. Put it back together and it seems to work ok.. Maybe one of those little particles jammed up the gears....
Take care quite often those crumbs are bits of gear teeth broken away. Sometimes the gear cog can move round and still work OK until a load comes on and then bham it slips.

If the crumbs are same colour as the gears ... and you have over-zealous amount of silicon grease in there ! It can be hidden from view.

Nigel
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Old 02-14-2015, 09:50 PM
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tolona
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Yes, they were white nylon crumbs, maybe manufacturing crumbs. The gears wheels looked ok , no missing teeth..
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Old 02-14-2015, 10:23 PM
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Sir Crash-A-Lot
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Originally Posted by gramps2361 View Post
I had a brand new emax 9 gram MG servo dead on arrival. When I contacted the seller I had to ship it back on my dime so they could test it.
Ok, you have me curious if it was me or not. I can't believe it would be since it was cheaper just to send out a new servo by the time I would pay $12 ($6 each way) in shipping. I only charged $12 I think it was for the metal gear servos anyway.

Shoot me a PM if you would and let me know.

Thanks, Mike
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