Forum Update - Announcement about May 10th, 2018 update and your password.

Parallax Continuous Servo and Pololu Wheels?

Where can I find information on the servo shaft and hub mounting pattern/size? I'm trying to figure out if these will fit

Also, please let me know if there are better wheel solutions that have a bigger diameter than the stock ones.


  • 3 Comments sorted by Date Added Votes
  • xanaduxanadu Posts: 3,185
    edited August 2017 Vote Up0Vote Down
    Are these too small?

    You would probably want to use the plastic servo horn that comes with the servo, and screw the Pololu wheel to that.

    The plastic shaft that sticks out of the servo probably wouldn't like the set screw on the metal wheel hub, which is designed for a D shaped, metal output shaft.

    How much weight will the wheels have on them?
  • As Xanadu mentions, these wheels aren't compatible with RC servos, Parallax or otherwise. They're made for motors with D-shaped shafts.

    You should also be aware that they are about 50% bigger than the standard wheels the Parallax servos are designed for. This means there's less torque available to the wheels, which could be a problem if the robot is heavier than average.

    You'd probably be better off using these wheels with the motors they are designed for. Pololu (and others) sell the motors with various gear ratios, so you can better match the wheel diameter/speed to your requirements. However, going this way will require you add a motor driver. All these changes add expense.
  • "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
Sign In or Register to comment.