Author Topic: time it takes for a servo to travel to it's position?  (Read 3651 times)

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Offline RebelgiumTopic starter

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time it takes for a servo to travel to it's position?
« on: August 17, 2008, 04:09:49 PM »
I have a Hitec HS422 servo with 2 Sharp sensors and a sensor-mounting bracket on top of it.
I was wondering how much time it takes for the servo to travel 2°. And howmuch time it takes to travel 4°...

The specs say:
"- Speed (sec/60o): 0.16"

So that's 60° travel in 0.16seconds. Does that mean that the time it takes to travel 2° is 0.16/30=5.3ms
Or is this not correct?
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Offline Trumpkin

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Re: time it takes for a servo to travel to it's position?
« Reply #1 on: August 17, 2008, 04:38:32 PM »
looks good to me.
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Offline Webbot

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Re: time it takes for a servo to travel to it's position?
« Reply #2 on: August 17, 2008, 04:50:31 PM »
Won't mass have some kind of effect? Ie if the servo is stationary then it could take longer to move the first two degrees than the second two degrees?
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Offline ArcMan

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Re: time it takes for a servo to travel to it's position?
« Reply #3 on: August 17, 2008, 04:54:44 PM »
Quote from: Rebelgium on August 17, 2008, 04:09:49 PM
I have a Hitec HS422 servo with 2 Sharp sensors and a sensor-mounting bracket on top of it.
I was wondering how much time it takes for the servo to travel 2°. And howmuch time it takes to travel 4°...

The specs say:
"- Speed (sec/60o): 0.16"

So that's 60° travel in 0.16seconds. Does that mean that the time it takes to travel 2° is 0.16/30=5.3ms
Or is this not correct?

No.  Unfortunately, it's more complicated than that.  Consider that the servo motor and gear train must accelerate from stop to max. speed at the beginning and from max. speed to stop at the end.  Your calculation would only be correct if the time for acceleration & deceleration is zero, which it's not.

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Offline ArcMan

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Re: time it takes for a servo to travel to it's position?
« Reply #4 on: August 17, 2008, 04:57:01 PM »
Quote from: Webbot on August 17, 2008, 04:50:31 PM
Won't mass have some kind of effect? Ie if the servo is stationary then it could take longer to move the first two degrees than the second two degrees?

You are correct, sir.
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