Machining

CNC Speed & Feed Calculator

Calculate optimal spindle speed and feed rate for machining operations based on material and tooling.

Input Parameters

Units:

Tool Diameter

Number of Flutes

Material

Tool Type

Results

Enter parameters and click Calculate

What is CNC?

CNC (Computer Numerical Control) machining is a manufacturing process where pre-programmed computer software controls the movement of factory tools and machinery.

Getting the right speed and feed rates is critical for efficient cutting, good surface finish, and maximizing tool life. Too fast can break tools; too slow wastes time and causes excessive heat buildup.

How to Use

Select your unit system (Imperial or Metric)
Enter the diameter of your cutting tool
Specify the number of flutes on your tool
Choose the material you're cutting
Select your tool type
Click Calculate to get your results

FAQs

Surface Feet per Minute (SFM) is the speed at which the cutting edge travels across the workpiece surface. It's determined by the material being cut and the tool type.

Different tool materials can withstand different temperatures. Carbide tools run faster than HSS because they maintain hardness at higher temperatures.

Use the maximum RPM your machine can achieve and reduce the feed rate proportionally. Consider using a smaller diameter tool if possible.

For most metals, yes. Coolant extends tool life and improves surface finish. For aluminum, use mist or air blast. Some plastics and wood cut better dry.

Limitations

• Values are starting points based on general industry guidelines
• Does not account for machine rigidity or spindle power
• Assumes standard tool geometries and helix angles
• Depth of cut and width of cut are not factored in
• Always verify with your tooling manufacturer's recommendations