Technical, Techniques, Hints, and Tips > The "Black Arts!" ( Electrics & Electronics )
HELP - Servos for ship's gun turrents
frogman3:
COULD anybody help me please i am attempting to get my gun turret turning which i have done an get the guns to elevate with a micro servo but to keep this simple the big servo that turns the turret works ok but the micro servo work ok when i turn the turret one way its fine an ok but when i turn the turret the other way the micro servo starts to jump an ends up in the revese postion an i have the servo both working off one channel through a action servo morph SO CAN ANYBODY TELL ME WHY THE MICRO SERVO IS Doin THAT ? :embarrassed: <:( an how to get it to go right ? >>:-( <*<
chris
HMS Invisible:
Decades-old rc electrics meant servos could be driven anywhere in the range 0.75 to 2.3 millisecond. That is why I put the same signal range limit on rc products driving a servo and why I also ensured that escs worked in the 0.75 to 2.3 millisecond range.
Beyond that range, I observed some servos exhibited the behaviour you see. It could be viewed as an electronic safety limit to prevent mechanical overdriving. That is why I have suggested increasing the span of a quarter turn servo by the addition of resistance either side of its position feedback potentiometer.
See https://www.google.com/search?q=servo+pwm&tbm=isch&source=iu&ictx=1
In short, without more information and testing, a likely cause is the servo is being driven beyond its timing range.
Modification is shown in the youtube video. https://www.youtube.com/watch?v=rU7LDKdKQH0
Umi_Ryuzuki:
Having absolutely no clue as to how your micro servo is connected...
My itty bitty brain, %) , says use a cam to elevate guns instead of a hard connection?
frogman3:
--- Quote from: HMS Invisible on June 15, 2022, 05:08:12 pm ---Decades-old rc electrics meant servos could be driven anywhere in the range 0.75 to 2.3 millisecond. That is why I put the same signal range limit on rc products driving a servo and why I also ensured that escs worked in the 0.75 to 2.3 millisecond range.
Beyond that range, I observed some servos exhibited the behaviour you see. It could be viewed as an electronic safety limit to prevent mechanical overdriving. That is why I have suggested increasing the span of a quarter turn servo by the addition of resistance either side of its position feedback potentiometer.
See https://www.google.com/search?q=servo+pwm&tbm=isch&source=iu&ictx=1
In short, without more information and testing, a likely cause is the servo is being driven beyond its timing range.
Modification is shown in the youtube video. https://www.youtube.com/watch?v=rU7LDKdKQH0
--- End quote ---
HI thank for your reply
chris
frogman3:
--- Quote from: Umi_Ryuzuki on June 15, 2022, 05:39:17 pm ---Having absolutely no clue as to how your micro servo is connected...
My itty bitty brain, %) , says use a cam to elevate guns instead of a hard connection?
--- End quote ---
AN HI also Umi WELL the micro servo is connected by a Y led from a servo morph an i have a sail winch servo on my main turret gear
hows that
chris
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