Build Your Own Combat Robot

FIGURE 14-12
The 4-inch-tall
aluminum channels
used for the frame
of Live Wires.
FIGURE 14-13
Cross-sectional
layout of the
new motor/sprocket
shaft adapter.
Chapter 14: Real-Life Robots: Lessons from Veteran Builders 323
to attach to the sprocket shaft. The other side has a ½-13 right-hand thread to
match the drill shaft. Down the center of the drill shaft is a 6-mm left-hand thread.
(I have no idea as to why Bosch uses English and metric threads on the same part.)
The left-hand thread prevents the adapter from unscrewing itself. Since the screw
that came with the Bosch drill is an odd-shaped screw, I used the Bosch screws instead
of trying to find my own.