Note: Training & sign-off is required to use this machine. This is an advanced piece of equipment that can cause harm to itself, the surroundings, users and bystanders. Do not hack this machine.
Trainers Daniel Johnsen, Micah "Meesh" Burkhardt, Brian Wagner, Tim VanSant
Instructions and How To
How to cut aluminum sheets Cutting_Aluminum_Sheet_On_Shopbot
X and Y limit switches for the shopbot are
Baumer Inductive sensor IFRM 08N37A3/S35L . DataSheet: 
Y Limit Switch replaced 5/7/19 by B Wagner Sensor purchased on ebay for about $50