Drill SFM Calculator

Formula

The formula to calculate the Drill Surface Feet per Minute (SFM) is:

\[ DSFM = 0.2618 \cdot D \cdot RPM \]

Where:

\(DSFM\) is the Drill Surface Feet per Minute
\(D\) is the diameter of the drill (inches)
\(RPM\) is the rotations per minute of the drill

What is Drill SFM?

Drill SFM, short for Drill Surface Feet per Minute, is a measure of the linear tangential distance the surface of the drill travels per minute of time. It is used to determine proper feed rates and total machine times.

Example Calculation

Let's assume the following values:

Drill Diameter (D) = 0.5 inches
Rotations per Minute (RPM) = 1500

Using the formula:

\[ DSFM = 0.2618 \cdot 0.5 \cdot 1500 \approx 196.35 \]

The Drill Surface Feet per Minute is approximately 196.35 SFM.