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How to Operate a Cobra Commutator Lathe

If your hobby includes small electric motors, such as radio-controlled (RC) cars, planes or trains, you might have contemplated building your own electric motors available as kits. When building small electric motors, you must machine the brass output shaft to fit the gears you plan to use on your vehicle. The Cobra Com lathe is the tool you need for machining the output shafts on your electric motor. It̵7;s a precision lathe that holds the motor in place while you machine the output shaft.

Things You'll Need

  • Multipurpose drip oil
  • Wrench set
  • 5-volt power source
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Instructions

    • 1

      Apply a drop of multipurpose drip oil to the armature support grooves located on the top of the lathe.

    • 2

      Loosen the bolts that hold the drive motor onto the base of the lathe. Use a wrench for this.

    • 3

      Place the drive belt over the center of the armature motor, then place the armature onto the armature support grooves. Then, place the other end of the drive belt onto the pulley attached to the drive motor.

    • 4

      Push down on the drive motor to create tension on the drive belt and then tighten the bolts to secure the motor into place.

    • 5

      Place a drop of oil onto the end of the armature where the armature shaft runs on the supports.

    • 6

      Turn the hand wheel on the carriage until the cutting tool is at the far right of the communicator housing. Inspect the screw that acts as the carriage stop. If there is a gap between the screw and the carriage, turn the screw out until it rests against the carriage. This sets the positive carriage stop. Rotate the hand wheel until the tool tip rests to approximately 1/32-inch past the left end of the communicator housing.

    • 7

      Turn the cross slide wheel until the tip of the tool rests 1/32-inch from the left edge and 1/32-inch out from communicator housing.

    • 8

      Turn on the lathe by connecting it to a 4-cell battery pack or 5-volt power source.

    • 9

      Turn the cross slide wheel until you see a very thin stream of metal come of the housing. Do not rotate the wheel any further.

    • 10

      Turn the carriage hand wheel counterclockwise to run the tool tip across the housing. Stop when you get to the positive stop.

    • 11

      Stop the lathe and then move the tool tip back to the original position.

    • 12

      Loosen the bolts on the motor and remove the communicator from the armature supports.


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