
174 Make: Robotic Arms
the actual CAD drawings used in the design of our arm. This image above
(Figure
9-12
) represents all the various lengths and angles used to design
one of the pieces used in link 2 of the design. If you notice, we use a length of
120 mm for link 2—the length of the distance between the motor shaft of the
motor used in the link and the center of the bearing on the other side of the
piece. (The actual length of the link is almost 160 mm, but the length isn’t
nearly as important to us.)
The final length we need to find is the length of link 3, and unfortunately,
we could use a few measurements. The measurement used should be ...