1. What is Inches Per Revolution (IPR)?

Inches Per Revolution (IPR) is a machining term that represents the distance the cutting tool advances along the workpiece for each revolution of the spindle. It's a critical parameter in machining operations.

2. How Does the Calculator Work?

The calculator uses the IPR formula:

Where:

• \( Feed\ Rate \) — Tool advance speed in inches per minute
• \( RPM \) — Spindle speed in revolutions per minute

Explanation: The equation calculates how many inches the tool moves forward with each complete rotation of the spindle.

3. Importance of IPR Calculation

Details: Proper IPR calculation ensures optimal cutting conditions, affects tool life, surface finish, and machining efficiency. It helps prevent tool breakage and workpiece damage.

4. Using the Calculator

Tips: Enter feed rate in inches per minute and spindle speed in RPM. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between IPR and IPM?
A: IPR (inches per revolution) is the feed per spindle revolution, while IPM (inches per minute) is the total feed rate. IPM = IPR × RPM.

Q2: What are typical IPR values?
A: Typical values range from 0.001 to 0.020 inches/rev depending on material, tool type, and operation, but can vary widely.

Q3: How does IPR affect machining?
A: Higher IPR increases material removal rate but may reduce tool life. Lower IPR improves surface finish but increases machining time.

Q4: Should IPR be constant for all operations?
A: No, optimal IPR varies based on material, tool type, depth of cut, and desired surface finish.

Q5: How does IPR relate to chip load?
A: For single-point tools, IPR equals chip load. For multi-tooth tools, chip load = IPR / number of teeth.