Mel Vallero, Adobe Stock - Vjom, Caleb Kraft
holes on the can, first measure the center-
to-center distance between two of the holes
in the motor. On a piece of cardboard, draw
an equilateral triangle with sides measuring
this same distance and cut out a triangular
hole. Center this triangular hole over the can’s
original axle holes and use a Sharpie to mark
the three corners. These marks are where you’ll
drill holes; position them so that the body of the
motors will end up lying somewhat against the
bottom of the garbage can when mounted. Drill
holes for each of the bolts at the three marks.
Push the motor shafts through the axle holes
and secure each motor with three M6×40mm
bolts with 1.0 thread (or whatever bolts fit your
specific motors).
The drive motors have long shafts onto which
each wheel can be mounted. Push a wheel onto
each shaft and test-fit so that there’s about a
¼" gap between the wheel and the garbage
can wall; this allows for some sagging of the
axles under load, otherwise the wheels will rub
against the can. Using a ⁄" bit, drill through
the plastic wheel collar (on the inside surface
of the wheel). Continue until the bit begins to
mark the surface of the steel motor shaft, then
stop. Repeat this process on the other wheel.
Remove both wheels and motors to finish
drilling through the hard steel shaft. Clamp the
motor shaft in a sturdy vise with your drill mark
facing directly upward. Use the center punch to
make a dimple at your mark, then carefully drill
a ⁄" hole entirely through the shaft. Use cutting
oil or a little WD-40 when drilling through metal
to keep the bit cool and sharp. Repeat this
process for the other shaft.
Use the ⁄" bit to complete the drilling
process through both wheel collars by drilling
a hole opposite to the first hole drilled into the
wheel collars. Reattach motors to the garbage
can using the bolts; these may be tightened
or loosened a bit to make the motor shafts
horizontal on both sides. Slide the wheels onto
each shaft, align the holes on the wheel collars
and motor shafts, and use cotter pins or nails to
secure the wheels (Figure
B
).
Cut and finish the steel strap for the caster
wheel, using your hacksaw/angle grinder and
file. Drill appropriately sized holes in the strap
(again using cutting oil) and garbage can. Bend
the strap using the bench vise and hammer in
a Z shape as shown, so that the garbage can
travels relatively upright when the caster wheel
is mounted. Install the front caster wheel and
fasten the steel strap using nuts and bolts
(Figure
C
).
2. CONNECT THE ELECTRICAL COMPONENTS
Connect the positive and negative leads of each
motor to the appropriate motor driver terminals.
Solder the inline switch in series to the positive
103
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A
B
Receiver, motor
driver
C
M74_100-7_TrashCanZombie_F1.indd 103M74_100-7_TrashCanZombie_F1.indd 103 7/18/20 1:08 PM7/18/20 1:08 PM
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