1. What is a Feed Rate Calculator for Lathe?

Definition: This calculator determines the feed rate (inches per minute) for lathe operations based on spindle speed (RPM) and feed per revolution (IPR).

Purpose: It helps machinists and CNC operators optimize cutting parameters for better surface finish and tool life.

2. How Does the Calculator 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 the feed per revolution gives the linear feed rate of the cutting tool.

3. Importance of Feed Rate Calculation

Details: Proper feed rate calculation ensures optimal material removal rates, prevents tool damage, and achieves desired surface finishes.

4. Using the Calculator

Tips: Enter the spindle RPM and feed per revolution (typically 0.001-0.020 in/rev for most materials). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical IPR value?
A: For roughing: 0.010-0.020 in/rev, for finishing: 0.003-0.010 in/rev, depending on material and tooling.

Q2: How does material affect feed rate?
A: Harder materials require lower feed rates, while softer materials can handle higher feed rates.

Q3: What happens if feed rate is too high?
A: Excessive feed rates can cause tool breakage, poor surface finish, and machine vibration.

Q4: How do I find the right RPM?
A: Use our RPM Calculator or consult cutting speed charts for your material.

Q5: Does this work for metric units?
A: For mm/min feed rate, use RPM × mm/rev (convert inches to mm if needed).