This is a simple guide for hacking a standard analog servo for achieving continuous rotation. This procedudre is not needed if you have 360° servo. Here is a video Showing this procedure
Tools needed:
- 4 22K ¼W 1% resistors
- a lancet (for plastic gears servo) or a small wrench (for metallic gears servo)
- a small phillips screwdriver
- soldering iron
- solder sucker
Locate the 4 screw in the lower part of the servo:
Unscrew the screws:
Disassemble the servo box:
Locate the gears:
Extract the gear with the hub and the ball-bearing on it:
Look at this gear: it has a small notch under the ball-bearing. The MG996R servo has a little metallic cilinder instead:
Now you must remove this notch. For a servo having plastic gears you can gently use a lancet or a small cutter: don't apply too much force OR THE ENTIRE GEAR WILL BROKE! For the MG996R servo you can use a small wrench for extracting the metallic notch by simply pulling it upward:
Now extract the servo PCB:
In the top part of the servo there is the potentiometer hub: is the one where the gear you've previously removed was placed. Gently press the potentiometer hub backward for pushing it out:
Now you've the potentiomer and pcb out:
Desolder the cables from the potentiomer:
Arrange the 2 22KΩ 1% resistor in this way:
Put the resistors in place of the potentiomer:
Re-assemble the servo. Do the same to other servo.