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continuos rotation help — Parallax Forums

continuos rotation help

um..., Hium..., Hi Posts: 64
edited 2005-08-23 17:15 in General Discussion
hey,

i was converting my parallax standard servo to continuous rotation and i ground of the tab on the main drive gear and it did not rotate 360* so i dug fruther and found this little booger (look at photos, its the little black mting that looks like a pointometer) it also keeps it from going 360 and it keeps the main gear inline si i cannot remove it and i cannot find away inside it, any help much apricieated!

-MM
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2304 x 1728 - 420K
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2304 x 1728 - 380K

Comments

  • um..., Hium..., Hi Posts: 64
    edited 2005-08-22 06:16
    oh sorry for the doubble post but the #on the yellow paper in the photo is a hot water serial #, just incase you were wondering!
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-08-22 14:59
    Hello,

    ·· The potentiometer section needs to be modified as well.· In some cases the shaft is cut.· I don't remember on the older docs you have what exactly the procedure was, but if you have them it should've covered that part.· The Potentiometer needs to be centered as well before being disabled.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • um..., Hium..., Hi Posts: 64
    edited 2005-08-22 18:45
    i was wondering what "older docs" you are refering to? and cant i just take the POT of where it is soldered?

    thanx,
    MM
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-08-22 22:40
    Okay,

    ·· Prior to us carrying the continuous rotation servos, some time ago there was a doc (Not sure if it was ours, or one on the web) explaining how to modify the servo for continuous rotation.· Of course, you can still find this information on the web, so...

    ·· As for removing the POT.· Sure, you can remove it.· The servo will no longer function properly without it though.· One work-around (And how I used to modify servos) is to put two matching resistors in place of the POT.· If the POT is 5K, you can put two 2.5K (Or close value) resistors in place of the POT by connecting them both to the center lead.· Then connect one to one of the remaining outer holes, and the other to the other outer remaining hole.· This will effectively make the servo think it's centered.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • um..., Hium..., Hi Posts: 64
    edited 2005-08-22 23:25
    how do i tell what value my POT is?
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-08-22 23:31
    Hello,

    ·· One of two ways...Either an Multi-Meter or read it carefully.· Most are labeled in some way.· Even a crude part# can often lead to the value.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Ryan ClarkeRyan Clarke Posts: 738
    edited 2005-08-23 17:15
    If you are still confused, try this page:

    http://www.ranchbots.com/club/papers/Modifying Hobby Servo Motors for Continuous Rotation.pdf

    Ryan

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    Ryan Clarke

    Parallax Tech Support
    rclarke@parallax.com
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