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General Speeds and Feeds Formulas

December 24, 2010, 2:10 pm by Eldar Gerfanov

Free Online Speed and Feed Calculators

Code

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)

Code

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?

Try our desktop  HSMAdvisor Speed and Feed Calc or Mobile/Online FSWizard

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:

Code

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:

Code

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)

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