Waist Movement > Forward - Back

To enable the arms of Francis to approach an object with great precision it has been necessary to develop an added movement.
A requirement has been that both arms can approach an object at the same speed and time. To accomplish this the marvelous design from the human body has had to be mimicked.

The undercarriage off a Volvo truck seat was salvaged along with the drive gearbox and motor. 

Fabrication started with fitting the tracks to the lower undercarriage.