Step 6: Modify the Servos for Continuous Rotation and Remove the Potentiometer

We won't go into too much detail on hacking a servo for continuous rotation - there are plenty of site on the web, and Instructables too. Some servos are easier, and if it looks tricky, ServoCity sells modified servos with the potentiometer outside already. For the HS-6965HBs, we pulled the gears, then popped the motor down by wedging a tiny screwdriver between the motor gear and the housing it is in to force it down. We then removed the pot and pulled the wires out through a small hole we drilled in the case. We have no idea if this is the proper way to do it. The HS-425BBs we originally used were even easier since the circuit board comes right out.

In both cases, we also cut off the limiting tab on the main gear. We used a Dremel tool for this - but we had to clean it well after that.

With the potentiometer outside, we extended the wired by a ~3 feet for the new potentiometers using some spare servo wire we had around, but pretty much any wire will do - you will need 3 conductors. On our servos, the yellow wire was the sweeper, and we used trial and error to find the correct wiring of the other two.





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