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HelicopterMain Discussion › Servo centering
03-07-2017 03:37 AM  8 months agoPost 1
tomtek

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ga

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What is considered the best brand of servo that has the best centering when the stick is released. My servos, after being activated, do not go back to the same location as before. Not much of a difference but it is noticeable.

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03-07-2017 05:22 AM  8 months agoPost 2
EEngineer

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TX

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Are they connected to an FBL controller?

Logo 600SXs, 800XX, TDR IIs

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03-07-2017 01:33 PM  8 months agoPost 3
ssmith512

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Indianapolis, IN USA

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Futaba BLS273SV S.Bus2

Magnificently precise servos.

Steve

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03-07-2017 01:53 PM  8 months agoPost 4
Four Stroker

rrElite Veteran

Atlanta

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Any of the SBus or XBus programmable servos can be set up to have essentially zero deadband. The catch is that the average current drain goes up dramatically.

A servo can be set up to have zero deadband and still not center because there is not enough torque near center. It will just sit there and buzz. Binding in the linkage will cause the effect that you describe.

The failure to center that you see can also be in the stick assembly (gimbal) and not in the servo. Your stick assembly AND your fingers are not really that good. There are wild claims for resolution - 4096 positions. You would be lucky if you had an effective resolution - stick to servo - of 512. 256 would be more typical. 90 degrees / 256 = 0.35 degrees. Can you see 0.35 degrees ?

Hall Effect sensors have a hysteresis of far more than 0.35 degrees.

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03-07-2017 05:28 PM  8 months agoPost 5
flycatch

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Barstow, California

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https://search.aol.com/aol/image?q=...gusaolp00000112 This is what you need to achieve absolute 90 degrees or servo center.

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03-07-2017 06:28 PM  8 months agoPost 6
EEngineer

rrProfessor

TX

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Don't you mean "dead band"?

Logo 600SXs, 800XX, TDR IIs

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03-07-2017 06:39 PM  8 months agoPost 7
Four Stroker

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Atlanta

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Automatic Spell Checker !

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03-07-2017 06:58 PM  8 months agoPost 8
Four Stroker

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Atlanta

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Hall Effect chips apparently add about 4 ms to the latency of your radio.

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03-07-2017 07:54 PM  8 months agoPost 9
EEngineer

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TX

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I was just kidding....lol

It reminded me an old joke with regards to a headband.

Logo 600SXs, 800XX, TDR IIs

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03-07-2017 09:03 PM  8 months agoPost 10
Richardmid1

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Leeds, England

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Here's a question, would a higher torque lower speed servo have better center repeatability due to the higher ratio gearing, meaning less servo arm movement per motor revolution?

60% of the time, it works every time!

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03-07-2017 10:33 PM  8 months agoPost 11
Flyin for Jesus

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Dana Point, Ca.​92629

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Here's a question, would a higher torque lower speed servo have better center repeatability due to the higher ratio gearing, meaning less servo arm movement per motor revolution?
Nope. The sensor is on the final gear, not the motor.

At least on all the servos I have taken apart.

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03-07-2017 11:25 PM  8 months agoPost 12
EEngineer

rrProfessor

TX

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Are the servos connected to the linkages?

Might check the centering when the servos aren't connected to their linkages.

Logo 600SXs, 800XX, TDR IIs

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03-07-2017 11:38 PM  8 months agoPost 13
Heli_Splatter

rrElite Veteran

USA

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So
1) is this a servo problem?
2) is this a transmitter/receiver problem
3) is this a FLB unit problem?

They seem to be intertwined.

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HelicopterMain Discussion › Servo centering
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