Hello. I am very new with cnc machines. I am building a 24" x 36" cnc machine out of aluminum stock. Linear motion will be done on ball bearings driven by a gear rack and spur. the motor kit that i am using will be from this link.
http://www.probotix.com/3_axis_stepp...or_driver_kit/
my goal is to cut cast aluminum parts. the only problem is im very confused on what ratios to use when i choose my gear rack and spur. I am getting mine from mcasters but there are so many choices and i am not comfortable to make this desicion on my own. can anyone that knows more about this advice me on the proper set up, thank you.