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Old Oct 13, 2009, 10:53 PM
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90 degree servos arms

How is everyone adjusting their servo arms to 90, are you guys just eye balling or use some type of tool?? What is the best way?
Thanks
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Old Oct 13, 2009, 11:07 PM
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After finding the arm that will get closest to 90deg I use Sub-Trim.
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Old Oct 14, 2009, 03:57 AM
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You should find that depending which way round you put the arm on the servo, it lines up better one way than the other.

To explain that a bit better, (if my memory is correct), there is an odd number of splines on the servo shaft and arm, and if you have a servo arm that has an arm out each side try it, then take it off, turn the arm 180deg and try again. Quit often it will line up better one way round than the other. (Ok so that may not have been any better )
If you have a spare servo output with four arms, try it in the four rotations, (90deg), to see the difference.

If you only have single arm ones then I eyeball, plus have the greater movement side to the control I prefer.
Another explanation ? , ask and I'll do a drawing, it's easier.
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Old Oct 14, 2009, 04:28 AM
An itch?. Scratch build.
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Here's the better explanation of that last statement.

It's basically differential movement. Often used for ailerons where more up movement than down is required. Similarly it can be used on elevator where you may want more up than down. Though it's not a lot of help on rudder .

So the arm doesn't have to be exactly 90deg, a few degrees in the right direction can help.

Anyway here's the picture.
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Old Oct 14, 2009, 06:19 AM
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Simply put, I get it as close as I can and then don't worry about it.
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Old Oct 14, 2009, 06:41 AM
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Quote:
Originally Posted by Mode One
Simply put, I get it as close as I can and then don't worry about it.
That idea has worked for me, for over 20 years.
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Old Oct 14, 2009, 07:02 AM
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Quote:
Originally Posted by RCFUN12
How is everyone adjusting their servo arms to 90, are you guys just eye balling or use some type of tool?? What is the best way?
Thanks
Assuming you are trying to simply get the arm at 90 degrees to the servo case, and you want an equal amount of throw in each direction, then see this mini-tutorial on how to use sub-trim to dial in the servo. Also, make sure you don't dial in too much sub-trim, as you can overdrive the servo by doing so.

Using Sub-Trim to set servos at 90 degrees

Chuck
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Old Oct 14, 2009, 10:52 AM
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Quote:
Originally Posted by NoFlyZone
Assuming you are trying to simply get the arm at 90 degrees to the servo case, and you want an equal amount of throw in each direction, then see this mini-tutorial on how to use sub-trim to dial in the servo. Also, make sure you don't dial in too much sub-trim, as you can overdrive the servo by doing so.

Using Sub-Trim to set servos at 90 degrees

Chuck
Chuck, 90 degrees to the servo case accomplishes nothing. It's more important to have the servo arm 90 degrees to the pushrod travel and I think this is what the O.P. was talking about.
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Old Oct 14, 2009, 10:59 AM
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Originally Posted by Mode One
Chuck, 90 degrees to the servo case accomplishes nothing. It's more important to have the servo arm 90 degrees to the pushrod travel and I think this is what the O.P. was talking about.
But if he learns how to use the case as a reference point, then he has learned how to set the arm for any angle from 1 degree to 360 degrees; since the process is exactly the same, right?

Chuck

By the way, if that's what you think he wanted to learn, then why, pray tell did you just tell him to set it close and not worry about it if it's important to have the arm at 90 degrees?
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