MACHINING FORMULAS S.F.M. = 0.262 x D x R.P.M. R.P.M. = (3.82 x S.F.M.) / D I.P.R. = I.P.M. / R.P.M. or CHIP LOAD x F I.P.M. = R.P.M. x I.P.R. CHIP LOAD = I.P.M. / (R.P.M. x F) or I.P.R. / F F= number of flutes D= diameter of cutter R.P.M= revolutions per minute S.F.M= surface feet per minute I.P.M= feed rate: inches per minute I.P.R= inches per revolution

Surface Feet Per Minute (SFPM) – The is the cutting speed of the end mill in the United States. It is the number of feet per minute that a given point on the circumference of a cutter travels per minute.

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As the depth of cut increases, use the largest diameter cutter available to maintain a depth to diameter ratio of 1 : 1.

Depth of Cut (DOC) – The depth of cut of the end mill into the part surface axially. With CNC milling, it is measured in the Z axis direction.

Revolutions Per Minute (RPM) – The spindle speed rate of the cutter. This value will be calculated from a selected S.F.P.M. or MPM.

Millimeters Per Revolution (MMPR) – Feed rate of the cutter each revolution of the cutter. In the metric system, the feed rate of the cutter can be calculated for each revolution of the cutter.

Inches Per Revolution (IPR) – Feed rate of the cutter for each revolution of the cutter. In the inch system, the feed rate of the cutter can be calculated for each revolution of the cutter.

Meters Per Minute (MPM) – The cutting speed of the end mill. This system is used in all countries that use the Metric system. MPM represents the rate of the surface of the cutter passes over the surface of the part. Cutting speed is measured in Meters per minute.

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