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General Speeds and Feeds Formulas

December 24, 2010, 2:10 pm

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Imperial Speed and Feed Calculator

 RPM= 12 x SFM = Please enter Speed and Diameter 3.14 x in

Feed Rate = RPM x x in = Please enter RPM, number of teeth and chip load (in/min)

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Metric Speed and Feed Calculator

 RPM= 1000 x M/min = Please enter Speed and Diameter 3.14 x mm

Feed Rate = RPM x x mm = Please enter RPM, number of teeth and chip load (mm/min)

Want something better?

More about formulas needed to calculate turning, drilling and of course milling speeds and feeds

Here are few basic formulas with term explanations to get you going:

Calculating Spindle Speed (RPM) Using Imperial Cutting Speed:

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 RPM= 12 x SFM 3.14 x Diameter

Simplified imperial formula:

 RPM= 3.8 x SFM Diameter

Calculating Spindle Speed (RPM) using Metric Cutting Speed:

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 RPM= 1000 x SMM 3.14 x Diameter

Simplified metric formula:

 RPM= 318 x SMM Diameter

Calculating Feed Rate :

Feed_Rate=RPM x N(teeth) x CL(chip load)