Steer Clear


Now that I’ve got forward/backward power on my leaf grinder robot entry for the Servo City #AHA Challenge, it’s time to add a steering control system.

Steering Parts

  • 2 – 2.975″ Wheels 595620 595618
  • 2 – Drive Wheel Adapter A 595630
  • 1 – 1.50″ Aluminum Channel 585440
  • 2 – 0.770″ Set Screw Hub 545548
  • 1 – HiTec Standard Hub Horn 525130
  • 1 – 1/4″ x 2.25″ Precision D-Shafting 634070
  • 1 – HiTec HS-422 Servo 31422S
  • 1 – Servo Plate A 575112
  • 4 – Attachment Block B 585600
  • 4 – 6-32 x 1/4″ Pan Head Phillips Screw 90272A144
  • 12 – 6-32 x 1/4″ Socket Head Machine Screw 632106



1. Remove the plastic horn from the servo and attach the aluminum horn.

2. Attach the servo to the aluminum servo plate with the Phillips head screws, then mount the servo assembly inside the chassis 4.50″ channel. The servo hub should be centered underneath the middle circle of the channel. Yes, the attached photograph is for demonstration of the assembly without visual obstruction from the chassis.


3. Attach each inside wheel adapter to each hub and mount the wheels on the adapters.

4. Slip the D-shafting inside one wheel hub and tighten the set screw.Slide the D-shafting through the center side circle of the channel and slip the other wheel onto the shafting and tighten the set screw. NOTE: during this assembly step my D-shafting was NOT 1/4″ bore. This manufacturing error prevented the shafting from sliding smoothly into each hub. Therefore, I had to replace the shafting.

5. Mount the channel with attached wheels to the upside down aluminum servo horn.


This concludes all of the safe and easy building steps for my leaf grinder robot. Now all of the dangerously fun stuff begins.


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