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:

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

Step 2:

Remove the stop on the gear.

Step 3:

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

Step 4:

Remove the electronic board, then remove the screw.

Step 5:

Remove pot from motor.

Step 6:

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

Step 7:

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:

Add the rail bed.

Step 9:

Add the bed caps.

Step 10:

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

Step 11:

Glue the angel to the servo horn.

Step 12:

Attach the battery case with velcro tape.

Step 13:

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