standard servos
Would anyone know the repeatability of the Parallax standard servo? In other words, If I give the servo a certain pulse, will it always return to the same spot or will it be off by some degree? Are they repeatable from servo to servo?
Thanks for the help.
Nick
Thanks for the help.
Nick
Comments
As such, exact repeatability wasn't really a goal -- close enough was close enough, if it was a little off the person holding the radio-control unit would tweak the joystick or adjust a trim control.
Having said that, I understand that repeatability is "pretty good" -- but I don't know +- how many arc-seconds that is. Also, different servo's position slightly differently given the same input -- probably depends on manufacturing tolerances, and the repeatability of the variable resistor inside each one.
The Parallax standard servo that I have has a dead band of 5 microseconds. Each microsecond of pulsewidth is approximately equal to .1 degrees. It's been a while since I tested it but I think it's repeatability is a little more than +/- .5 degrees.
So yes, they will be off by some small degree and no, I would not expect each servo to respond identically. Close maybe, but not identical.
If you need better accuracy look for a digital servo with low dead band.
You can also increase accuracy through gearing, though you would lose travel.
Rich H
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The Simple Servo Tester, a kit from Gadget Gangster.
As far as an exact error...... the manufacturer might be able to help with that or buy one and see? The standard analog servos are pretty rough for any precise and repeatable motion though.
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"puff"...... Smile, there went another one.
Post Edited (Spiral_72) : 4/30/2010 2:49:54 AM GMT