1. What is Gear Module?

The gear module is a fundamental parameter in gear design that represents the size of the gear teeth. It is defined as the ratio of the pitch diameter to the number of teeth and is typically measured in millimeters.

2. How Does the Calculator Work?

The calculator uses the gear module formula:

Where:

• \( m \) — Gear module (mm)
• \( OD \) — Outside diameter (mm)
• \( N \) — Number of teeth

Explanation: This formula calculates the module of a gear based on its outside diameter and number of teeth, which is essential for gear design and manufacturing.

3. Importance of Gear Module Calculation

Details: Accurate module calculation is crucial for proper gear meshing, power transmission efficiency, and preventing gear failure in mechanical systems.

4. Using the Calculator

Tips: Enter the outside diameter in millimeters and the number of teeth. Both values must be positive numbers (OD > 0, N ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for gear modules?
A: Gear modules typically range from 0.5 mm to 25 mm, with smaller modules used for precision instruments and larger modules for heavy machinery.

Q2: How does module relate to gear size?
A: Larger module values indicate larger teeth and generally stronger gears capable of transmitting more torque.

Q3: Can I use this calculator for both spur and helical gears?
A: This formula is primarily for spur gears. For helical gears, the calculation should consider the helix angle.

Q4: What's the relationship between module and diametral pitch?
A: Module is the metric equivalent of diametral pitch (used in imperial systems), with module = 25.4 / diametral pitch.

Q5: Why is the formula OD/(N+2) instead of OD/N?
A: The "+2" accounts for the addendum, which is the height of the tooth above the pitch circle, typically equal to one module.