Surface Feet per Minute (SFPM)
Material High-Speed Steel Carbide
Plastics 500 800
Aluminum 300 600
Brass 200 400
Mild Steel 125 250
Stainless Steel 100 200



Mill/Drill Spindle Speeds

Spindle Speed = 4 x SFPM / Tool Diameter

Mill Feed Rate

Feed Rate = Chip Load x Teeth x Spindle Speed
Chip Loads: 0.001-0.002"

Lathe Spindle Speeds

Spindle Speed = 4 x SFPM / Part Diameter