oddWires Arduino Robotics Kit With Motor Shield Manual page 17

Here's the motor, mounting plates
and two long machine screws & two
nuts. Solder the black & red leads to
the motors as shown.
Slip the two mounts into the positions
shown in the next photo. The mounts
should be positioned so that the piece
that will hold the motors to the base
will be on the top of the finished
chassis. Loosely tighten the nuts until
you have the motors aligned, and then
tighten. You should not over-tighten
anything, as the base is acrylic not
metal!
Both of the motors attached with
mounts (note mirror image). Keep the
screw heads on the outside to avoid
the wheels being fouled by the screw
ends.
Here's another view of the motors
installed on the chassis base.
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oddWires Arduino Robotics Kit