A cable driven drawing machine created by David Bynoe for the Telus Spark Science Center in Calgary, Alberta. The machine is controlled with LinuxCNC using a custom kinematics module and python script written by Kevin Loney.
Each of the four stepper motors is connected to a pulley and string. By winding in or letting out string on each corner the computer can position the draw head anywhere in three dimensional space. Watch how the machine operates in the video below.