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Inch Feed Rate Conversion Formulas:

Inches Per Minute (IPM) to Inches Per Revolution (IPR) Formula:

Inches Per Revolution (IPR) = Inches Per Minute ÷ Revolutions Per Minute (RPM)

Example:

You want to Convert a 25.0 Inches Per Minute Feed Rate to an Inches Per Revolution Feed Rate when the Spindle is Turning at 6000 RPM

25.0 ÷ 6000 = .0042 Inches Per Revolution (IPR)


Inches Per Revolution (IPR) to Inches Per Minute (IPM) Formula:

Inches Per Minute (IPM) = Inches Per Revolution (IPR) x Revolutions Per Minute (RPM)

Example:

You want to Convert a .009 Inches Per Revolution Feed Rate to an Inches Per Minute Feed Rate when the Spindle is Turning at 5000 RPM

.009 x 5000 = 45 Inches Per Minute (IPM)


Inches Per Minute (IPM) to Inches Per Tooth (IPT) Formula:

Inches Per Tooth (IPT) = Inches Per Minute (IPM) ÷ (Revolutions Per Minute x Number of Teeth)

Example:

You want to Convert a 30.0 Inches Per Minute Feed Rate to an Inches Per Tooth Feed Rate when the Spindle is Turning at 6000 RPM and the Cutter has 14 Teeth or Flutes

30.0 ÷ (6000 x 14) = 30.0 ÷ 84000 = .0004 Inches Per Tooth Feed Rate


Inches Per Tooth (IPT) to Inches Per Minute (IPM) Formula:

Inches Per Minute (IPM) = Inches Per Tooth (IPT) x Revolutions Per Minute (RPM) x Number of Teeth / Flutes of Cutter

Example:

You want to Convert an Inches Per Tooth Feed Rate of .0005 when the Spindle is Turning at 6000 RPM and the Cutter has 10 Teeth or Flutes

.0005 x 6000 x 10 = 30.0 Inches Per Minute Feed Rate


Inches Per Tooth (IPT) to Inches Per Revolution (IPR) Formula:

Inches Per Revolution (IPR) = Inches Per Tooth (IPT) x Number of Teeth / Flutes of Cutter

Example:

You want to Convert an Inches Per Tooth Feed Rate of .0005 and the Cutter has 10 Teeth or Flutes

.0005 x 10 = .005 Inches Per Revolution Feed Rate


Inches Per Revolution (IPR) to Inches Per Tooth (IPT) Formula:

Inches Per Tooth (IPT) = Inches Per Revolution (IPR) ÷ Number of Teeth / Flutes of Cutter

Example:

You want to Convert a .008 Inches Per Revolution Feed Rate to an Inches Per Tooth Feed Rate when the Cutter has 16 Teeth or Flutes

.008 ÷ 16 = .0005 Inches Per Tooth Feed Rate


Metric Feed Rate Conversion Formulas:

Millimeters Per Minute (MMPM) to Millimeters Per Revolution (MMPR) Formula:

Millimeters Per Revolution (MMPR) = Millimeters Per Minute ÷ Revolutions Per Minute (RPM)

Example:

You want to Convert a 125.0 Millimeters Per Minute Feed Rate to a Millimeters Per Revolution Feed Rate when the Spindle is Turning at 5000 RPM

125.0 ÷ 5000 = .025 Millimeters Per Revolution (MMPR)


Millimeters Per Revolution (MMPR) to Millimeters Per Minute (MMPM) Formula:

Millimeters Per Minute (MMPM) = Millimeters Per Revolution (MMPR) x Revolutions Per Minute (RPM)

Example:

You want to Convert a .025 Millimeters Per Revolution Feed Rate to an Millimeters Per Minute Feed Rate when the Spindle is Turning at 5000 RPM

.025 x 5000 = 125 Inches Per Minute (MMPM)


Millimeters Per Minute (MMPM) to Millimeters Per Tooth (MMPT) Formula:

Millimeters Per Tooth (MMPT) = Millimeters Per Minute (MMPM) ÷ (Revolutions Per Minute x Number of Teeth)

Example:

You want to Convert a 130.0 Millimeters Per Minute Feed Rate to a Millimeters Per Tooth Feed Rate when the Spindle is Turning at 6000 RPM and the Cutter has 12 Teeth or Flutes

130.0 ÷ (6000 x 12) = 130.0 ÷ 72000 = .0018 Millimeters Per Tooth Feed Rate


Millimeters Per Tooth (MMPT) to Millimeters Per Minute (MMPM) Formula:

Millimeters Per Minute (MMPM) = Millimeters Per Tooth (MMPT) x Revolutions Per Minute (RPM) x Number of Teeth / Flutes of Cutter

Example:

You want to Convert a Millimeters Per Tooth Feed Rate of .01 when the Spindle is Turning at 5000 RPM and the Cutter has 8 Teeth or Flutes

.01 x 5000 x 8 = 400.0 Millimeters Per Minute Feed Rate


Millimeters Per Tooth (MMPT) to Millimeters Per Revolution (MMPR) Formula:

Millimeters Per Revolution (MMPR) = Millimeters Per Tooth (MMPT) x Number of Teeth / Flutes of Cutter

Example:

You want to Convert a Millimeters Per Tooth Feed Rate of .017 and the Cutter has 16 Teeth or Flutes

.017 x 16 = .272 Millimeters Per Revolution Feed Rate


Millimeters Per Revolution (MMPR) to Millimeters Per Tooth (MMPT) Formula:

Millimeters Per Tooth (MMPT) = Millimeters Per Revolution (MMPR) ÷ Number of Teeth / Flutes of Cutter

Example:

You want to Convert a .036 Millimeters Per Revolution Feed Rate to a Millimeters Per Tooth Feed Rate when the Cutter has 14 Teeth or Flutes

.036 ÷ 14 = .0026 Millimeters Per Tooth Feed Rate


Feed Rate Conversion Formulas:

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