Continuous rotation servos: What's the modification?
Rayman
Posts: 14,183
Just looked at a couple hacks and it's not really clear what's going on...
One site suggests that it's the pot that mechanically stops the servo from doing a 180.
(I find it hard to believe, but he shows several pictures on how to·modify the pot·it)
Another says it's an extrusion on a gear that does it...·
(This one looks more believeable).
Anybody know how to turn a Parallax "standard servo" into a "continuous rotation" servo?
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm
One site suggests that it's the pot that mechanically stops the servo from doing a 180.
(I find it hard to believe, but he shows several pictures on how to·modify the pot·it)
Another says it's an extrusion on a gear that does it...·
(This one looks more believeable).
Anybody know how to turn a Parallax "standard servo" into a "continuous rotation" servo?
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm
Comments
www.kronosrobotics.com/an116/GAN116.shtml
Basically, you are taking the pot (which acts like two varying resisters to tell the control system where the motor is pointing) and either center it and remove it from the motor shaft so that it is more like two fixed resistors, or you replace the pot with two fixed resistors. This will tell the control system that the motor is centered. Next you remove the extrusion on the shaft so that when the control tells the (currently centered - so it thinks) motor to turn so that the shaft is pointing a bit to the clockwise, it will turn (of course the pot never changes to reflect the new position, so the control keeps trying to move the shaft a bit to the clockwise. This results in the motor continuously moving, trying to change the resistance of the pot. The extrusion on the shaft is to prevent continuous rotation, which you do not want on a standard servo.
Art
I'd like to open up a "continuous" servo to see what they did with the pot, but I don't want to destroy my BoeBot yet...
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm
This post is being moved from the Propeller Chip forum to the Sensors forum, as it is not specifically Propeller related.
Thank you!
-- Jessica
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Jessica Uelmen
Education Department
Parallax Inc.
Post Edited (Jessica Uelmen (Parallax)) : 5/19/2010 4:22:01 PM GMT
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