1. What is Grinding Wheel Speed?

Grinding wheel speed, measured in surface feet per minute (sfm), is the linear velocity of a point on the grinding wheel's circumference. It's a critical parameter in grinding operations that affects surface finish, wheel wear, and material removal rate.

2. How Does the Calculator Work?

The calculator uses the grinding wheel speed formula:

Where:

• \( V \) — Grinding wheel speed (sfm)
• \( d \) — Wheel diameter (inches)
• \( n \) — Wheel rotational speed (rpm)
• \( \pi \) — Mathematical constant (~3.1416)

Explanation: The formula converts rotational speed (rpm) to linear speed (sfm) by accounting for the wheel's circumference and converting inches to feet.

3. Importance of Wheel Speed Calculation

Details: Proper wheel speed is essential for safe operation, optimal surface finish, and preventing wheel damage. Excessive speed can cause wheel breakage, while insufficient speed reduces cutting efficiency.

4. Using the Calculator

Tips: Enter wheel diameter in inches and rotational speed in RPM. The calculator will output the surface speed in feet per minute (sfm).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical grinding wheel speed?
A: For aluminum oxide wheels, 5,500-6,500 sfm is common. For CBN wheels, 3,000-5,000 sfm is typical. Always consult wheel manufacturer specifications.

Q2: Why is wheel speed important?
A: Wheel speed affects cutting action, surface finish, wheel life, and most importantly, safety. Never exceed the wheel's rated speed.

Q3: How does wheel diameter affect speed?
A: As wheels wear and diameter decreases, the RPM must increase to maintain the same surface speed.

Q4: What happens if speed is too high?
A: Excessive speed can cause wheel breakage, overheating, and poor surface finish. It's extremely dangerous.

Q5: How often should I recalculate wheel speed?
A: Recalculate whenever changing wheel diameter (including due to wear) or when changing RPM settings.