1. What is a CNC MDF Feeds and Speeds Calculator?

Definition: This calculator determines optimal spindle speed (RPM) and feed rate (IPM) for machining Medium Density Fiberboard (MDF) on CNC routers.

Purpose: Helps CNC operators achieve clean cuts while maximizing tool life and efficiency when working with MDF.

2. How Does the Calculator Work?

The calculator uses two fundamental formulas:

Where:

• \( RPM \) — Spindle speed (revolutions per minute)
• \( SFM_{mdf} \) — Surface feet per minute for MDF
• \( D \) — Cutting tool diameter (inches)
• \( IPM \) — Feed rate (inches per minute)
• \( IPT \) — Inches per tooth (chip load)
• \( Z \) — Number of teeth on the cutter

Explanation: The first formula converts SFM to RPM based on tool diameter. The second calculates feed rate based on RPM, chip load, and tooth count.

3. Importance of Proper Feeds and Speeds

Details: Correct settings prevent burning, minimize tool wear, reduce vibration, and ensure clean cuts in MDF material.

4. Using the Calculator

Tips: Enter the recommended SFM for MDF (typically 400-600), tool diameter, chip load (typically 0.008-0.015 for MDF), and number of teeth. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical SFM for MDF?
A: 400-600 SFM is common for MDF, but always consult your tool manufacturer's recommendations.

Q2: How do I determine IPT (chip load)?
A: Start with manufacturer recommendations (typically 0.008-0.015" for MDF) and adjust based on cut quality.

Q3: Why does tool diameter affect RPM?
A: Larger tools must rotate slower to maintain the same cutting speed (SFM) at their outer edge.

Q4: When should I reduce feed rates?
A: For deep cuts, small diameter tools, or when experiencing tearout or burning.

Q5: How does number of teeth affect feed rate?
A: More teeth allow higher feed rates while maintaining the same chip load per tooth.