Home›Gear Education

Technical Resources

Gear World Technical Library

9+ Technical Articles Gear Fundamentals Engineering Formulas Selection Guides KHK USA Exclusive

Gear FundamentalsCalculation GuidesEngineering FormulasSelection GuidesStandards ReferenceBacklash ControlModule SystemPitch & Pressure AngleGear RatioLubrication GuideTolerance ClassesNoise ReductionGear FundamentalsCalculation GuidesEngineering FormulasSelection GuidesStandards ReferenceBacklash ControlModule SystemPitch & Pressure AngleGear RatioLubrication GuideTolerance ClassesNoise Reduction

All 9 Articles

KHK Gear Education Library

What is Gear Module?

Understand the metric module system, how it compares to Diametral Pitch, and how to specify the right module for your application.

5 min readRead Article

How to Calculate Gear Ratio

Step-by-step gear ratio calculation for spur, helical, and compound gear trains with…

Gear Terminology Glossary

43 essential gear engineering terms defined with formulas and links to relevant…

Gear Backlash Guide

Understand gear backlash — how to set it, measure it, acceptable margins,…

Gear Formulas & Calculators

Complete reference of gear geometry formulas: Lewis bending stress, contact stress, and…

DP to Module Conversion

Convert between Diametral Pitch and metric Module — full cross-reference table and…

Gear Selection Guide

How to choose the right gear type, material, module, and precision class…

Gear Lubrication

Lubrication types, selection, application methods, and maintenance intervals for metric gear systems.

Gear Noise Reduction

Identify the causes of gear noise and vibration, and learn proven techniques…

Ready to Source Metric Gears?

KHK USA stocks 2,600+ metric gear configurations. Factory direct from Japan — 3-day USA delivery, no minimum order.

Request a Quote All Gear Types