1. What is a Speed and Feed Calculator for MDF?

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

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 two key formulas:

Where:

• \( RPM \) — Spindle speed in revolutions per minute
• \( SFM \) — Surface feet per minute (recommended for MDF)
• \( D \) — Cutting tool diameter in inches
• \( IPM \) — Feed rate in inches per minute
• \( IPT \) — Feed per tooth in inches
• \( Z \) — 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, tooth load, and tooth count.

3. Importance of Proper Speed and Feed

Details: Correct RPM and IPM settings prevent burning, tearout, and premature tool wear while ensuring efficient material removal.

4. Using the Calculator

Tips: Enter the recommended SFM for MDF (typically 300-600), tool diameter, feed per tooth (start with 0.005-0.015"), and number of teeth.

5. Frequently Asked Questions (FAQ)

Q1: What SFM should I use for MDF?
A: Start with 400 SFM for carbide tools. Reduce for smaller tools or if burning occurs.

Q2: How do I determine feed per tooth?
A: For MDF, start with 0.010" per tooth and adjust based on tool size and cut quality.

Q3: Why does tool diameter affect RPM?
A: Smaller tools must spin faster to maintain the same cutting speed (SFM) at the edge.

Q4: How does number of teeth affect feed rate?
A: More teeth allow faster feed rates as each tooth takes a smaller bite of material.

Q5: Should I adjust for different tool materials?
A: Yes, HSS tools typically require lower SFM values than carbide tools.