1. What is Feed Rate in Turning?

Definition: Feed rate is the velocity at which the cutter advances against the workpiece, measured in inches per minute (ipm).

Purpose: Proper feed rate calculation ensures efficient material removal, good surface finish, and optimal tool life.

2. How Does the Formula Work?

The calculator uses the formula:

Where:

• \( FR \) — Feed Rate (inches per minute)
• \( RPM \) — Spindle speed (revolutions per minute)
• \( IPR \) — Feed per revolution (inches per revolution)

Explanation: The spindle speed multiplied by feed per revolution gives the linear feed rate of the cutting tool.

3. Importance of Feed Rate Calculation

Details: Correct feed rate prevents tool breakage, ensures dimensional accuracy, and optimizes machining time.

4. Using the Calculator

Tips: Enter the spindle RPM and feed per revolution (IPR). Typical IPR values range from 0.001 to 0.020 depending on material and tooling.

5. Frequently Asked Questions (FAQ)

Q1: How does feed rate affect surface finish?
A: Higher feed rates can produce rougher finishes, while lower feed rates give smoother finishes but increase machining time.

Q2: What happens if feed rate is too high?
A: Excessive feed rates can cause tool breakage, poor surface finish, and dimensional inaccuracies.

Q3: How do I determine the right IPR?
A: Consult tool manufacturer recommendations based on material, tool type, and desired finish.

Q4: Does this formula work for all materials?
A: The formula is universal, but optimal RPM and IPR values vary significantly between materials.

Q5: How does feed rate relate to chip load?
A: Chip load is directly determined by feed per tooth (for milling) or feed per revolution (for turning).