Parts List

1 arduino duemilanove
1 Adafruit Motor/Stepper/Servo Shield for Arduino kit
2 additional L293D motor driver chips (piggybacked on existing motor party chips)
2 Lin Engineering 4118S-15-13 stepper motors
1 Bournes ENA1J-B28-L00064L-ND Optical Encoder
2 12v, 0.25A fans
1 12v, 2.83A power supply
1 threaded rod from McMaster-Carr 99030A115
2 3/8 inch alluminum rods from local hardware store
1 round nut from McMaster-Carr 95072A771
2 timing pulleys from SPD/SI (A 6M35M036DF1010) and (A 6M35M012DF1005)
1 timing belt from SPD/FI (A 6T35MF061100)
1 10mm shaft from SPD/FI (A 7X 1M100300)
4 10mm pillow bearings from SPD/FI
4 shaft collars from SPD/FI
1 sheet 1/4 inch plexiglass
3/4 inch particle board