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Speeds and Feeds
Feed and Speed rates need to be determined to optimize machining time, surface finish, and tool life. Speeds and Feeds along with required horsepower can be calculated using the machinist's handbook and a series of formulas. Information in the Machinists Handbook assumes production speeds: i.e. an average tool life of less than two hours.

Production speeds state the maximum production for the cost of tooling, though they are sometimes impractical for the small jobs done at the machine shop. However, calculated speed and feed rates do give a useful reference in determining what rates should be used for our purposes. The following demonstrates how to calculate Speeds and Feeds for a surface milling or slotting operation.

Handbook Values:
  • SFM (ft/min): (Surface Feet per Minute)- Also called Cutter speed. Speed of a point on the outside diameter of the tool. Value depends on material.
  • FPT (in): (Feed Per Tooth)- Also called Chip Load. Amount of stock removed by each tooth during a single revolution. Value depends on stock material, tool size, and tool material.
  • HPF (HP*min/in3): (Horse Power Factor) - number used to calculate power requirement. Value depends on material.

Other Variables:
  • D (in): Diameter of tool
  • N: Number of teeth or flutes
  • DOC (in): (Depth Of Cut)
  • RPM: (Rotations Per Minute) Spindle Speed
  • IPM (in/min): (Inches Per Minute) Also called Feed Rate. Rate at which the work piece is moved into the tool.
  • MRR (in3/min): (Metal Removal Rate) Rate of volume removal
  • HP: (Horse Power) necessary power

  • RPM = SFM*12/(1.618*D)
  • HP = MMR*HPF

Input Air Turbine Spindles® governed speeds from 25,000 to 90,000RPM and you will see the scale of savings these direct drive spindles can achieve in your application.
These air turbine spindle, air turbine tools, air turbine motors are all products of air turbine technology, inc. Designed to out perform the cnc spindle or cnc machine spindle with a revolutionary pneumatic motor, air turbine spindles are designed to work with chiron, dmg moro seiki, doosan, fadal, emco, haas, hardinge, hartford, hermle, hurco, hwacheon, kitagawa, makino, mazak, okuma, romi and many other cnc machines. Also compatible with brother, fanuc, haas, matrix and other drill-tap machines for cnc milling with our high speed precision pneumatic air spindles. Our air turbine motors are high speed, efficient, pneumatic motors. These pneumatic motors are designed for lathe, robot, machining, debarring, finishing, routing, drilling and milling, a very versatile fixture mount. We also manufacture air turbine hand tools that are engraving tools, finishing tools, grinders, pencil tools, routing tools and marking tools. Air Turbine manufactures hand tools, grinders, pencil tools, debarring tools, finishing tools, which are all low vibration tools, precision tools, and ergonomic tools. These tools are performance tools, low weight tools, with an air turbine motor. Air Turbine motors require no oil, have no gears or vanes, for reliability. Made in USA.
All prices in US Dollars, FOB., Boca Raton, Florida, USA. International local pricing will vary, depending on location, to include: shipping, freight, handling, customs and excise duties, local taxes and handling, currency exchange rates, etc. All specifications approximate.