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Meg Chen |
University of British Columbia |
PHYS 420C (2024) |
Design + Construction
The complete design of the ballistic cart can be
accessed from this Onshape Design Link.
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1)
Gather
the materials. (Bumper, the 4 wheels, train body, electronics portion,
non-slip rubber carpet tape) 2)
Stick
the non-slip rubber carpet tape on the main wheels. 3)
Take
the different components of the circuit (charging port, switch, motors, etc), figure out where to place each component in the
train. I did mine like this: Note: There are
two switches in the circuit because mine wouldn't work without them for some
reason. Note: Leave space
for the rod connecting the sub-wheels. Note: It might be easier
to not construct the train body just yet so that it is easy to put in the
circuit components.
4)
Connect
the circuit using the circuit diagram below, use solder, wire, and heat
shrinks tube where needed:
Note: Pause after
each step to check that the circuit is working. Note: Check that
the motors are moving in the right direction after being connected to
circuit. Note: When
constructing, keep in mind how far each component is from each other and use
appropriate lengths of wire to avoid cluttering. 5)
Construct
the train body and add in the circuit with hot glue. Result should look like
the photo in step 2). Note: I found it
easier to construct the train body while glueing different components of the
circuit on the train, but it is just personal preference. 6)
Add
the sub-wheels 1.
Use a
hammer to put one end of the rod into one of the wheels 2.
Insert
wheel + rod into the holes on the train 3.
Use
hammer to carefully put in the other wheel (turn the train sideways) 7)
Connect
the main wheels to the motors. Note: Don't use
glue for it, it should just lock in by itself 8)
Use
hot glue to attach the bumper onto the train Note: There are
two parts of the bumper, one rectangle, one T shape. The rectangle is
directly stuck to the train, and the T shape is glued below it. 9)
Complete!
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