Enter the diameter of the workpiece and the RPM (revolutions per minute) into the calculator to determine the surface footage. This calculator helps in determining the linear distance a point on the circumference of a rotating object travels in one minute.
Surface Footage Formula
The following formula is used to calculate the surface footage:
SF = (pi * D * RPM) / 12
Variables:
- SF is the surface footage (feet per minute)
- D is the diameter of the workpiece (inches)
- RPM is the revolutions per minute of the workpiece
To calculate the surface footage, multiply the diameter of the workpiece by pi, then multiply the result by the RPM, and finally divide by 12 to convert inches to feet.
What is Surface Footage?
Surface footage is a measure of the linear distance that a point on the circumference of a rotating object travels in one minute. It is a common metric used in machining to help determine the cutting speed of a tool as it interacts with a workpiece. Proper calculation of surface footage is crucial for achieving desired machining results and extending the life of cutting tools.
How to Calculate Surface Footage?
The following steps outline how to calculate the Surface Footage:
- First, determine the diameter of the workpiece (D) in inches.
- Next, determine the RPM (revolutions per minute) of the workpiece.
- Use the formula SF = (pi * D * RPM) / 12 to calculate the Surface Footage (SF).
- Finally, calculate the Surface Footage (SF) in feet per minute.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Diameter of the workpiece (D) = 4 inches
RPM (revolutions per minute) = 1000 RPM