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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Mikado VBAR Control System › How to center servos while bulding a heli with Vbar NEO/Control?
04-30-2018 03:52 PM  15 months ago
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HawkNoob

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How to center servos while bulding a heli with Vbar NEO/Control?
Hi all, this is my first time around with the Vbar NEO. What is the proper way to center the servos while building a heli when using the NEO/Vbar Control radio before the actual setup after the heli is built?
Thanks!
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04-30-2018 04:40 PM  15 months ago
rcflyerheli

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This is a direct copy of my answer from your post on the other board.

I do the servo centering before I actually install them. I have an accurate gauge that I use to insure they are exactly 90 degrees to the servo axis. It is easier for me to play with spline orientations when I can get to the servos to index the arms. When you are setting the center position, get it centered, and then check your trim numbers. If they are more than 40, then re-index your output arm and recenter. Sometimes, you might even have to change arms to get good numbers.

I always put a dot of paint from an artist paint pen on the plug of each one, ie, 1 dot for servo 1, two dots for servo 2 and 3 dots for servo 3. That way I know which channel to plug the wires into after I get them mounted.

Also since you are doing the setup i\with a Vcontrol TX, don't use the basic servo trim function in the main rotor setup. Scroll down to Expert, and use the Servo Center Trim, otherwise you might end up using enough trim to run a servo out of its allowable center range of +/- 40., and the basic trim function will move all the swash servos, as it is basically a swash trim, not a servo center trim.
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-01-2018 12:26 AM  15 months ago
cdrking

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Just curious, where does the +/- 40 number come from? Does it come from the NEO manual?To hover is divine, the alternative is rather PLANE.
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05-01-2018 02:06 AM  15 months ago
rcflyerheli

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That is per Ron at Mikado. If the center trim numbers are more than 40, it messes up the servo travel at the ends and the servo loses power. Ideally, the servo should be centered with 0 trim, but unless you are running something like the JR clamp on output arms, you can rarely find a spline orientation that will allow a 0 trim value.Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-01-2018 02:17 AM  15 months ago
rcflyerheli

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Here is a screen shot of the 5.3 trim page on the legacy Vbar setup. Apparently it has carried over through to the Vcontrol and Neo, however on the Neo software trim page, that limit is not specified.

Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-01-2018 03:31 PM  15 months ago
Pistol Pete

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rcflyerheli...
If the center trim numbers are more than 40, it messes up the servo travel at the ends and the servo loses power.
Whenever you "shift" center by any amount, you also have changed the equal amount of travel per side.

On the other hand, servos torque, which is always measured from one inch from horn screw is not affected, regardless of end point travel.

If you are subtrimming as much as 40, something is mechanically off.

Some radios allow you change the trim "step" travel.
~~Enjoying the hobby one flight at a time~~
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05-01-2018 05:34 PM  15 months ago
VinceY

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The carbon fiber control arms that bolt onto stock plastic servo arms can also be set with zero subtrim. Or very close.Team Synergy/ Rail Blades
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05-01-2018 06:13 PM  15 months ago
rcflyerheli

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I have found that with single arm servo outputs, (Futaba 25 spline gears), the numbers will range from 9 or 10, up to around 30. I can't make a blanket statement that they will be nearly 0.Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-24-2018 10:38 PM  15 months ago
HawkNoob

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Not familiar with the Jeti servos myself but sure makes it easier to be able to program the exact neutral/center you need with these telemetry servos. http://www.jetimodel.com/en/katalog...-Servo-TD1609S/
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05-24-2018 11:46 PM  15 months ago
DemetriusUSN

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Ive been using this one for years without any issues what so ever. When I bought mine it was $12.....

https://hobbyking.com/en_us/turnigy...rvo-tester.html
Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770
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05-25-2018 12:01 AM  15 months ago
JuanRodriguez

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How does that help set the servo to neutral ?Been there, done that and old enough to know better.....
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05-25-2018 12:06 AM  15 months ago
DemetriusUSN

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It has manual, neutral and autoMinicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770
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05-25-2018 12:33 AM  15 months ago
JuanRodriguez

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I understand that.....

But even so, you’ll most likely need sub trim to get the setup correct....

Right ??
Been there, done that and old enough to know better.....
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05-25-2018 12:47 AM  15 months ago
HawkNoob

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05-25-2018 01:12 AM  15 months ago
JuanRodriguez

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There is nothing that can’t be overcome if you throw enough money at it !!! Been there, done that and old enough to know better.....
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05-25-2018 01:43 AM  15 months ago
HawkNoob

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JuanRodriguez...
There is nothing that can’t be overcome if you throw enough money at it !!!
Ain't that the truth!
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05-25-2018 03:27 AM  14 months ago
Eury

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Dover NH USA

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I center them using the servo test function on my iCharger 308b. Plug them in, and go I to the menu and tell it to send a center pulse. Then try different arms until I find the right one. Bolt it on and finish the build. When it is plugged in and setup on the Neo it needs no trim.Nick Crego

Citizen #0168
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05-25-2018 01:43 PM  14 months ago
KevinB

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Earth

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Just go into the model setup - cyclic trim menu of the VControl with the servos plugged into the NEO. Assuming you haven't added any trim values in yet, that will zero all 3 swash servos regardless of stick positions. Then install the arms to 90 degrees of your control rods or servo cases.
Note, some manufacturers will make 2 or 3 versions of their control arms with slightly different orientation of the splines in the socket. So, if the arm you are trying to fit to the servo is off in equal directions going from one spline to the next, try a different arm and it may go on at near zero.

KevinB
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