Introduction: Christmas Rail Car 8

Picture of Christmas Rail Car 8

A rotating angel inside an open ball is rail car number eight in what (I hope) will be a series of ten, one published every two weeks until Christmas. This O gauge car (wheels, axle, coupler and bed are all 3D printed plastic) is part of an active train.

Step 1:

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Start by converting a servo motor to a battery powered gear motor. Remove the four screws from the bottom of the motor.

Step 2:

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Remove the stop on the gear.

Step 3:

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Remove solder from the two tabs that attach to the motor.

Step 4:

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Remove the electronic board, then remove the screw.

Step 5:

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Remove pot from motor.

Step 6:

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Solder wires to motor, then replace back and assemble with 4 screws.

Step 7:

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Using a 3d printer, print the various parts. Print the ball at 120% size and cancel when it is 70% complete. Print the angel at 65% size.

Assemble the rail carrier and wheels.

Step 8:

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Add the rail bed.

Step 9:

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Add the bed caps.

Step 10:

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Insert the servo motor, then solder the leads from a battery carrier (2 AA) to the motor leads.

Step 11:

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Glue the angel to the servo horn.

Step 12:

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Attach the battery case with velcro tape.

Step 13:

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Glue the ball to the servo base, place on a track and let it ride!

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About This Instructable

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Bio: I am an author and a maker. My current project is Santa's Shop. I'm working on a science fiction type book--more later. @EngineerRigsby
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