Marker Test #1 Size Functionality Critical marker diameter for marker chuck. Want the marker to fit snugly in the chuck. Critical marker length for the design. Want the marker to be able to touch and lift off the paper when needed.

Marker Functionality #1 Test Markers (Red Sharpe) 1234Average Diameter (inches) Length (inches)

Marker Functionality Test #2 Scribble Test Reasons for Test: See if marker tip changes shape. See how often a marker would have to be changed.

Marker Functionality Test #2 Scribble Test of Sharpe Estimated life of marker is about 60 minutes of constant ink tip contact. The tip does not change shape dramatically.

Torque Test -Turret Increment Reason for Test: Turret needs to spin in order to have the pen come off the paper and/or when a different color pen is needed. Need to select a motor that will have enough torque to spin the turret to the desired position.

Torque Calculations TRIALSFORCE (N) AVG. FORCE =.43 N =.0097 lb DISTANCE =.1101m =.36 ft TORQUE = Force x Distance.035 ft-lb =.0097 lb x.36 ft SAFTEY FACTOR = 4 Stepper Motor Torque = Saftey Factor x Torque.14 ft-lb = 4 x.035 ft-lb Stepper Motor Torque =.14 ft-lb =.67 in-oz

Stepper Motor Selection Torque - at least.67 in – oz 12V power Supply Step Angle = 45º Shaft Diameter = 3/16”