A - Building A Basic Chassis With Indirect Drive; Chassis; Motor Mounts And Drive Wheels - pitsco Tetrix Creator's Manual

A – Building a Basic Chassis with Indirect Drive
The chassis constructed in this section is a basic
rectangular chassis with four wheels and two drive
motors. This provides basic construction information.
You can use different channel pieces, have three
wheels instead of four, or otherwise change this
chassis to fit your design.

Chassis

1) Set two 288 mm channel pieces side by side with
the open end of the U-shape facing down. Set
two more 288 mm channel pieces across the first
two, but with the open end of the U facing in
toward each other (Figure A1).
2) Align the holes of the top channels to the holes of the bottom channels where
you'd like them to be (in the model pictured, the top channels are fastened at the
four large holes from each end to create a bumper). At each corner, drop
two SHCSs down through the two small holes on either side of the large hole
(Figure A2).
3) Thread the kep nuts on the end of the screws. Using the 7/64" hex wrench,
tighten the screws.
4) Repeat Steps 2-3 for the other three corners.

Motor Mounts and Drive Wheels

In this model, the motors are not directly driving
the wheels but instead are turning gears that will
connect with gears on the wheels. A direct-drive
setup is covered on page 8.
1) Set one motor mount along the top of one
bottom piece of channel. Determine where you
want the motor to rest – be sure to allow space
for the wheel and the gears. Note that the motor
mount holes align with the smaller holes on the
channel and that you can use any two parallel
holes in the circle (Figures A3 and A4).
2) Using the 1-1/2" screws that come with the
mount, bolt down the unclamping end. Bolt
the other side, but do not tighten it all the way
(Figure A5).
3) Place a gear hub spacer on the center hole of a
wheel and line up their holes. Thread a 1-1/4"
screw that comes with the hub through a small
hole on the other side of the wheel (Figure A6).
6
Figure A1
Figure A3
Figure A5
Figure A2
Figure A4
Figure A6
TETRIX by Pitsco 39132 V0909