This video introduces the concept of conjugate action for mechanical spur gears. This relates to a specific gear tooth shape, known as an involute, that ensures a constant speed ratio. This is important for smooth rotational power transfer and other desirable mechanical traits. This video complements the information in the Shigley's Mechanical Engineering Design Textbook (Chapter 13, 9th edition). A physical demonstration of involute gear tooth geometry construction is provided, along with analytical tools for spur gear kinematics, and worked-out examples of gear geometry design.

This video is one of several in-depth lectures intended for UIUC students enrolled in SE 410 (Component Design). Students enrolled in SE 410 obtain access to all lecture videos, as well as expert guidance in learning mechanical and structural component and system design topics. Enrolled SE 410 students also are provided access to MATLAB code and additional tools related to this topic.

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