Lathe RPM Calculator

Formula

The formula to calculate the Lathe RPM is:

\[ \text{LRPM} = \frac{\text{SFM}}{\text{D}} \times 3.82 \]

Where:

\(\text{LRPM}\) is the lathe rotations per minute
\(\text{SFM}\) is the surface feet per minute
\(\text{D}\) is the diameter of the tool (in inches)

What is Lathe RPM?

Lathe RPM (Rotations Per Minute) refers to the speed at which a lathe machine is turning. The correct lathe RPM depends on the size of the tool, the material being cut, and the operation being performed. Adjusting the RPM ensures efficient and precise cutting.

Example Calculation

Let's assume the following values:

Surface Feet per Minute (SFM) = 300
Diameter of Tool (D) = 2 inches

Using the formula:

\[ \text{LRPM} = \frac{300}{2} \times 3.82 = 573 \]

The Lathe RPM is 573.

Another example with different values:

Surface Feet per Minute (SFM) = 500
Diameter of Tool (D) = 1.5 inches

Using the formula:

\[ \text{LRPM} = \frac{500}{1.5} \times 3.82 = 1273.33 \]

The Lathe RPM is 1273.33.