1. What is a CNC Feed Rate Calculator for Wood?

Definition: This calculator determines the optimal feed rate for CNC routers when cutting wood, based on spindle speed, chip load, and number of cutter teeth.

Purpose: It helps woodworkers and CNC operators achieve clean cuts while maximizing tool life and efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FR \) — Feed rate (inches per minute)
• \( RPM \) — Spindle speed (revolutions per minute)
• \( IPT \) — Inches per tooth (chip load for wood)
• \( Z \) — Number of teeth on the cutter

Explanation: The spindle speed multiplied by chip load per tooth gives feed per revolution, which is then multiplied by number of teeth for total feed rate.

3. Importance of Feed Rate Calculation

Details: Proper feed rates prevent burning, ensure clean cuts, extend tool life, and optimize machining time.

4. Using the Calculator

Tips: Enter the spindle RPM, recommended IPT for your wood type (default 0.01"), and number of cutter teeth (default 2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical IPT for wood?
A: Softwoods typically use 0.01-0.015", hardwoods 0.008-0.012", but always check tool manufacturer recommendations.

Q2: How does feed rate affect cut quality?
A: Too slow can cause burning, too fast can lead to tearout. Optimal feed rate produces clean chips.

Q3: When would I adjust the RPM?
A: Based on cutter diameter - larger diameters typically need lower RPM to maintain proper surface speed.

Q4: How do I find the right IPT?
A: Consult tool manufacturer charts based on wood type, cutter material, and operation (roughing vs finishing).

Q5: Does this work for plywood and MDF?
A: Yes, but use lower IPT values (0.008-0.010") for these materials to prevent splintering.