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RPM = Revolutions Per Minute  

SFM = Surface Feet Per Minute

SMPM = Surface Meters Per Minute


RPM to Surface Feet Per Minute

To Calculate SFM (Surface Feet Per Minute) Use the Formula Below:

Surface Feet Per Minute (SFM) = .262 x Diameter ( Tool or Stock ) x RPM

Example:

You have an endmill or stock diameter of .375 inches and you want to calculate the Surface Feet Per Minute of the endmill or stock when it is turning at 6000 RPM then multiply the endmill diameter of .375 by .262 then multiply that number by the RPM of 6000 to calculate the Surface Feet Per Minute (SFM).

Example: .375 x .262 x 6000 = 589.5 SFM (Surface Feet Per Minute)


Surface Feet Per Minute to RPM

To Calculate RPM (Revolutions Per Minute)  Use the Formula Below:

Revolutions Per Minute (RPM) = 3.82 x SFM (Surface Feet per Minute) ÷ Diameter ( Tool or Stock )

Example:

You have an endmill or stock diameter of .875 inches and you want to calculate the RPM (Revolutions Per Minute) of the endmill or stock when it is turning at 325 SFM (Surface Feet Per Minute). To calculate the RPM (Revolutions Per Minute), multiply the SFM (Surface Feet Per Minute) by 3.82 then divide that number by the tool or stock diameter to calculate the RPM (Revolutions Per Minute) of that tool or stock diameter.

Example: 3.82 x 325(SFM) ÷ .875(Tool or Stock Diameter) = 1419 RPM (Revolutions Per Minute)


Surface Meters Per Minute to Surface Feet Per Minute

To Convert SMPM (Surface Meters Per Minute) to SFM (Surface Feet Per Minute) Use the Formula Below:

SFM (Surface Feet Per Minute) = 3.2808399 x SMPM (Surface Meters Per Minute)

Example:

You want to convert 525 SMPM (Surface Meters Per Minute) to SFM (Surface Feet Per Minute). Example: 3.2808399 x 525 SMPM = 1722 SFM


Surface Feet Per Minute to Surface Meters Per Minute

To Convert SFM (Surface Feet Per Minute) to SMPM (Surface Meters Per Minute) Use the Formula Below:

SMPM (Surface Meters Per Minute) = .3048 x SFM (Surface Feet Per Minute)

Example:

You want to convert 480 SFM (Surface Feet Per Minute) to SMPM (Surface Meters Per Minute). Example: .3048 x 480 SFM = 146 SMPM


Cutting Speed Formulas:

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All of the Speeds and Feeds Calculations can be easily done in the Web Machinist Software Program’s Feeds & Speeds Conversions Calculators (below) Available Here