In this cutting speed calculator, we will show you how to find the cutting speed in a matter of seconds.
We will also help you understand what cutting speed is, and the cutting speed formula while we’re at it.
What is cutting speed?
How is it related to the tool diameter and spindle speed?
How to calculate cutting speed for different materials? Find all the answers here!
Cutting Speed Calculator
RPM
Real-World Applications
| Application | Description |
|---|---|
| Turning Operation | Determining the cutting speed for lathe operations to avoid tool wear. |
| Milling | Selecting spindle speed for efficient milling of metals. |
| Drilling | Finding appropriate RPM for drill bits based on diameter. |
Narrative Example
Problem: A lathe operator wants to cut a steel rod of 2 inches diameter at 600 RPM. Find the cutting speed in SFM.
Step 1: Given Data
- Diameter, D = 2 inches
- Rotational speed, N = 600 RPM
Step 2: Formula
V (SFM) = (π × D × N) / 12
Step 3: Calculation
V = (3.1416 × 2 × 600) / 12
V = 3141.6 / 12 = 261.8 SFM
Step 4: Answer
The cutting speed is 261.8 SFM.
Cutting Speed Reference Table
This table helps you understand recommended cutting speeds for different materials and tools.
| Material | Tool Type | Recommended Cutting Speed (SFM) | Notes |
|---|---|---|---|
| Mild Steel | High-Speed Steel (HSS) | 60-90 | For rough turning |
| Mild Steel | Carbide | 300-400 | For high-speed finishing |
| Aluminum | HSS | 300-600 | Depends on alloy type |
| Brass / Copper | HSS | 150-300 | Soft metals allow faster cutting |
| Cast Iron | HSS / Carbide | 80-250 | Carbide preferred for better finish |
Use this table as a guideline for selecting cutting speed. Actual speed may vary based on machine, tool condition, and workpiece setup.
FAQs
What is cutting speed?
Cutting speed is the speed at which a cutting tool moves over the workpiece. How fast should a tool move? We explain it here!
Why is cutting speed important?
Why do we care about cutting speed? It helps prevent tool wear, improve surface finish, and make machining faster and safer.
How to choose cutting speed for different materials?
Different materials need different speeds. How fast should you cut steel vs aluminum? Check out our reference table for quick guidance.
Can cutting speed be used for any tool or machine?
Yes! Whether it’s a lathe, drill, or milling machine, you can calculate the cutting speed using diameter and RPM.