As I discovered with a similar system, a cheap arm's motions are also not easily repeatable. I wanted to pick up CDs and move them around via robotic arm, with

As I discovered with a similar system, a cheap arm's motions are also not easily repeatable. I wanted to pick up CDs and move them around via robotic arm, with something similar to the Armatron. We discovered that there's enough slop in the system as to make anything remotely precise impossible.