2. Unit 19 Cam Diagrams and Prints

3. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Identify types of cams used in industrial applications. Explain terms related to cams and followers. D Balamut/Shutterstock.com

4. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Learning Objectives Interpret displacement diagrams with respect to the rise, fall, and dwell of a cam follower during a cycle. Identify different methods for calculating motion transition in displacement diagrams.

5. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Cams Cams are used to transmit rotary motion into linear or special angular motion A common cam is an irregularly shaped disc that causes a follower to move in a reciprocating fashion

6. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Types of Cams

7. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Wedge Cams Even a wedge or angled slot can serve as a cam

8. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Types of Followers

9. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Cam Terminology

10. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Cam Terminology Cam profile: The shape of the surface upon which the follower has contact –For a face or barrel cam, the shape of the groove Oscillate: To move back and forth in a repeating fashion Displacement: The distance that a follower rises or falls during a portion of the cycle

11. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Cam Terminology Dwell: Period of time for which the follower does not rise or fall during a portion of the cycle Cycle: Cam movement from a home position to other positions and then back home –In the case of a round follower, one 360° revolution of the cam Base circle: A circle that represents the shape of a cam that would result in no movement of the follower

12. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Cam Displacement Diagrams A displacement diagram is a designer’s tool that graphically diagrams the follower displacement for one cycle

13. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Follower Motion Options One of various motion techniques can be used to minimize part wear and improve efficiency

14. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. Reading Cam Prints The print for a cam feature may incorporate cam terminology in the dimensioning techniques

15. Copyright Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. What do you see? Print supplied by Hydro-Gear.