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Walter’s Turtle 101

1 / 8 - in holes

3
2 / 4 in

125° 10 in
3
2 / 4 in
Wheel

5
3 / 8 in
3
/ 4 in
Axle
Height
1 / - in hole for axle 1 / - in hole for axle
8
8

Wheel size 2 in

Figure 8.17 Rear axle bracket detail.

the ends of the upper bracket. Then secure the upper bracket to the bumper
using 5­40 machine screws and nuts.

Attaching Bumper to Robot Base
1
The bumper is attached to the robot body by the upper bracket. Drill three � ­in
8
1
holes in the top of the upper bracket. One � ­in hole is in the center, and the two
8
1
other holes are 1 � in away from the center hole (see Fig. 8.29). Three matching
8
holes are drilled in the robot base behind the servomotor. The holes should be
placed so that the bumper (once secured to the base) has adequate clearance ( �
1
8
1
to � in) from the back wheels. The matching center hole on the base must be off­
4
1
set by moving the drilled hole forward on the base by about � in.
4