1. What is a Turning Feed Rate Calculator?

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

Purpose: It helps machinists and CNC programmers 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 ensures optimal material removal, good surface finish, and prevents tool damage from too aggressive or too light cuts.

4. Using the Calculator

Tips: Enter the spindle RPM and feed per revolution (default 0.010 in/rev). All values must be > 0.

5. Frequently Asked Questions (FAQ)

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

Q2: How does feed rate affect surface finish?
A: Higher feed rates create rougher finishes but remove material faster. Lower feed rates produce smoother finishes but take longer.

Q3: When would I need to adjust the feed rate?
A: When changing materials, tool types, or when experiencing poor surface finish or tool wear issues.

Q4: How do I determine the proper RPM?
A: RPM depends on material and cutter diameter. Use our RPM Calculator or refer to tool manufacturer recommendations.

Q5: Does this work for metric units?
A: The same formula applies for metric (mm/min = RPM × mm/rev), but you'll need to convert the units.