1. What is a Drilling Feed Rate Calculator?

Definition: This calculator determines the feed rate (how fast the drill advances) based on spindle speed (RPM) and feed per revolution (IPR).

Purpose: It helps machinists and engineers optimize drilling operations for efficiency 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 feed per revolution gives the linear feed rate of the drill bit.

3. Importance of Feed Rate Calculation

Details: Proper feed rate calculation ensures optimal material removal rates, prevents tool breakage, and improves surface finish.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's a typical IPR for drilling?
A: For standard HSS drills, IPR ranges from 0.001" to 0.020" depending on material and drill size.

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 rate can cause tool breakage, poor hole quality, and increased heat generation.

Q4: How do I find recommended RPM for a drill bit?
A: Use the formula: RPM = (4 × SFM)/D where SFM is surface feet per minute and D is drill diameter in inches.

Q5: Does this work for CNC machines?
A: Yes, this is the fundamental calculation used in CNC programming for drilling operations.