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What would be the best way to turn a steering wheel? — Parallax Forums

What would be the best way to turn a steering wheel?

.:John:..:John:. Posts: 64
edited 2008-04-04 06:34 in General Discussion
So my latest project is an autonomous go kart. I am working with my boe-bot before I scale up. A question about steering.

1. What is the best way to hook up a servo to turn the steering wheel?

2. Any way to hook up a servo to push a gas pedal?

Any feedback is great. Thank you!

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2008-04-02 00:22
    In answer to question #2)· Mount a cam on the servo.
    accel_servo.JPG
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  • .:John:..:John:. Posts: 64
    edited 2008-04-02 16:59
    Thanks! That is a great idea PJ.

    About the steering wheel. Could I just use the gears from the tank treads to turn a steering wheel, or is there a better way. I want to use the parallax servo i already have.

    Post Edited (curious_roboticist) : 4/3/2008 2:19:48 AM GMT
  • .:John:..:John:. Posts: 64
    edited 2008-04-03 02:18
    Do these servos have the torque needed to do this?
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2008-04-03 02:23
    What, the Parallax servos?· No.
  • parts-man73parts-man73 Posts: 830
    edited 2008-04-03 03:44
    Also, consider eliminating the gas pedal and operate the throttle directly with a servo.

    Look at this picture of Parallax's QuadRover - www.parallax.com/Portals/0/Images/Prod/Q/QuadRover03_L.jpg You'll see how they did it.

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  • tedbeautedbeau Posts: 48
    edited 2008-04-03 13:02
    As a suggestion to control steering wheel. You might consider a continuos rotation servo with a small (maybe even smaller than a bicycle) chain sprocket on it. Attach a very large, as big as the steering wheel sprocket to the wheel. That may give you enough torque to turn the wheel. I believe the Mythbusters have used this arraingement to control a full size car!

    Ted
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2008-04-03 14:17
    curious_roboticist,

    I don't know if this would help for an idea or not... http://forums.parallax.com/showthread.php?p=525233

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    IC Layout Engineer
    Parallax, Inc.
  • .:John:..:John:. Posts: 64
    edited 2008-04-03 15:55
    That picture of the servo controlling the throttle gave me an idea. I could replace the front wheels with the front of a bicycle. A servo with a wheel will be connected to the handlebars. When the servo turns, the wheel turns
  • automatonautomaton Posts: 12
    edited 2008-04-04 06:34
    curious_roboticist

    Not knowing the size of the cart and other parameters... I wouldn't use a servo, unless you get a high torque digital one (maybe..).· I would just use a motor from a drill·and reverse the polarity on the motor to change the direction.· Perhaps even a wheel chair motor.·

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