1. What is Drill Cutting Speed?

Definition: Cutting speed (vc) is the speed at the periphery of the rotating tool relative to the workpiece, measured in meters per minute.

Purpose: It helps machinists determine the optimal rotational speed for drilling operations to ensure tool longevity and efficient material removal.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( vc \) — Cutting speed (m/min)
• \( D \) — Drill diameter (mm)
• \( n \) — Rotational speed (RPM)
• \( π \) — Pi (approximately 3.1416)

Explanation: The formula converts the peripheral speed from mm/min to m/min by dividing by 1000.

3. Importance of Cutting Speed Calculation

Details: Proper cutting speed ensures optimal tool life, prevents overheating, and maintains efficient material removal rates.

4. Using the Calculator

Tips: Enter the drill diameter in millimeters and the rotational speed in RPM. Both values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical cutting speed for steel?
A: For HSS drills in mild steel, cutting speeds typically range between 20-30 m/min.

Q2: How does material affect cutting speed?
A: Harder materials require lower cutting speeds, while softer materials can handle higher speeds.

Q3: What happens if cutting speed is too high?
A: Excessive speed can cause rapid tool wear, overheating, and poor surface finish.

Q4: How do I calculate RPM from cutting speed?
A: Rearrange the formula: \( n = \frac{vc \times 1000}{π \times D} \)

Q5: Why is cutting speed measured at the periphery?
A: Because this is where the tool experiences maximum speed and wear.