Step 5 - Mount Right Servo

Mounting the Right servo in the Chassis

For all ActivityBot robots, but read carefully. Directions are slightly different for robots with external encoders.

Parts needed for this step:

  • (1) Parallax mini combo wrench (#700-10025)
  • (1) Parallax screwdriver (#700-00004)
  • (2) #4-40 nylon core lock-nuts
  • (2) 3/8-inch pan-head steel screws
  • (1) Servo with horn removed; High Speed (#900-00025) or Feedback 360° (#900-00360)
  • prepared chassis

Lock-nuts have white Nylon inserts that make a tight grip on screws, so they don't loosen easily with vibration. But, they take a little more force to install.

As you work, press the closed end of the little black wrench over each lock-nut to hold it in place while attaching the screws.

  • Position the right servo inside its chassis mounting hole so the spline is towards the middle of the robot and the servo cord is next to the grommet.

  • Find the two servo mounting holes that are closer to the outer edge of the chassis.
  • Using two 3/8 inch metal pan-head screws and two lock-nuts, attach the servo to the outer-edge mounting holes.

  • Tighten securely.


  • If your ActivityBot Robot Kit has external encoders, go straight to Step 6 - Mount Left Servo.
  • If your ActivityBot Robot has Feedback 360° servos, keep going here.

Parts needed to complete:

  • (2) #4-40 Nylon core lock-nuts
  • (2) 3/8-inch pan-head steel screws
  • Use two more screws and lock-nuts to finish mounting the right servo — four screws in all — before going to Step 6.