1. What is Chip Per Tooth (CPT)?

Chip Per Tooth (CPT) is a machining parameter that represents the thickness of material removed by each cutting tooth during one revolution of the tool. It's a critical factor in determining optimal cutting conditions for milling operations.

2. How Does the Calculator Work?

The calculator uses the CPT formula:

Where:

• \( Feed \) — Feed rate (mm/min)
• \( RPM \) — Rotations per minute
• \( Teeth \) — Number of teeth on the cutting tool

Explanation: The formula calculates how much material each cutting tooth removes during one complete revolution of the tool.

3. Importance of CPT Calculation

Details: Proper CPT calculation ensures efficient material removal, extends tool life, prevents tool breakage, and achieves better surface finish. It helps optimize machining parameters for specific materials and cutting tools.

4. Using the Calculator

Tips: Enter feed rate in mm/min, RPM value, and number of teeth on the cutting tool. All values must be valid positive numbers (teeth must be at least 1).

5. Frequently Asked Questions (FAQ)

Q1: Why is CPT important in machining?
A: CPT directly affects tool life, surface finish, and machining efficiency. Proper CPT ensures optimal chip formation and prevents tool overload.

Q2: What are typical CPT values for different materials?
A: CPT varies by material: aluminum (0.1-0.3mm), steel (0.05-0.2mm), titanium (0.04-0.1mm). Always consult tool manufacturer recommendations.

Q3: How does CPT relate to feed per revolution?
A: Feed per revolution (FPR) = CPT × Number of teeth. CPT is per tooth, while FPR is per revolution.

Q4: What happens if CPT is too high or too low?
A: Too high CPT can cause tool breakage and poor surface finish. Too low CPT can cause tool rubbing, excessive heat, and reduced tool life.

Q5: Should CPT be adjusted for different cutting operations?
A: Yes, roughing operations typically use higher CPT values, while finishing operations use lower CPT values for better surface quality.