Not sure what the point is, but you could have a look at this eBay C64 oddity, and probably acquire a rather obscure Robot Arm Kit for your Commodore 64 or 128. Seller ships worldwide and provides with this quite informational paragraph too:
The ROBOTIC ARM TRAINER teaches the basic robotic sensing and locomotion principles, testing your motor skills, as you build and control the Arm. You can command this unit with it's five-switch, wired controller with corresponding lights to grab, release, lift, lower, rotate wrist and pilot sideways 350 degrees. After assembly, observe the dynamics of gear mechanisms through the transperent Arm. Five motors and five joints allow flexibility and fun! For educators and home schoolers.