Machine Design

How-to, in-depth technical articles for machine design engineers

Chemical Engineering

The industry gateway for chemical engineering and plant operations.

Design-2-Part

How OEM's can make their parts better, faster, and more efficient.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

more free magazines
Epicyclic Gear Train

Epicyclic gear trains are powerful when used correctly, but are often misunderstood. Illustrated below is a typical epicyclic gear train. Notice how the planet gears roll on and revolve about the sun gear. The ring gear rolls on the planet gears. Such a gear configuration has useful applications, but the overall gear ratio is quite difficult to intuitively calculate. Please select "Epicyclic Ratio Calc'n" to learn about an effective yet simple method for calculating the overall gear ratio.