1d. For the caster’s swivel mount, run four #4 screws through 4 small metal wash- ers, then through the 4 mounting holes around the rear caster hole in the large acrylic base piece. Drop the bearing holder (the acrylic square with the larger center
hole) over the 4 screws. Drop
the bearing into the holder,
then drop 4 small acrylic
washers onto the screws.
Finally, drop the bearing
retainer (the square with the
smaller hole) onto the screws
and over the bearing. Secure
with nuts.
The metal washers provide
clearance; without them, the
caster will hit the screws.
1d
1f
1g
1e TIP: Tweezers help to hold the nut in place while you start the screw.
1e. Attach the side pieces
to the top of the base by
fitting 4 nut/bolt pairs into
its cross-slots, as in Step 1b.
Use 2 more nuts and bolts
to join the tops of the side
pieces to the crossbar piece.
1f. Assemble the sensor tray
from the sensor shelf, sensor shelf riser, 2 sensor shelf
brackets, and 6 nut, screw,
and washer sets. As with the
other acrylic pieces, fit the
tabs into the slots and secure
by twisting the nuts down on
the bolts in their cross-slots.
The sensor shelf will act as
a base for attaching the
robot’s sensors.
1g. Attach the sensor tray to
the front of the chassis with
2 screws.
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