DNT 242 MACHINE MECHANISM ELEMENTS Chapter 5 CAM

DNT 242 – MACHINE MECHANISM ELEMENTS Chapter 5 CAM AND FOLLOWER

DNT 242 – MACHINE MECHANISM ELEMENTS v Brief introduction about basic of camshaft and follower. v Discuss the configuration and arrangement of camshaft and follower. v Define base circle, prime circle, pitch curve and other nomenclature. v Calculate velocity and acceleration motion. v Perform design of camshaft and follower base on the movement types.

Chapter 5: CAM AND FOLLOWER INTRODUCTION q A cam is a mechanical element used to drive another element, a follower, through a specified motion by direct contact. q A cam system consists of the cam itself and the follower, which moves through a guide and provides the output motion. q A cam and follower system is a system/mechanism that uses a cam and follower to create a specific motion.

Chapter 5: CAM AND FOLLOWER INTRODUCTION • A cam converts a rotary input motion into either reciprocating or oscillatory output action.

Chapter 5: CAM AND FOLLOWER INTRODUCTION • The cam has a very important function in the operation of many classes of machines, especially those of the automatic type, such as printing presses, shoe machinery, textile machinery, gear-cutting machines, and screw machines.

Chapter 5: CAM AND FOLLOWER Classification of Cam Mechanisms • Cam mechanisms can be classified by: q modes of input/output motion. q the type of the follower. q the arrangement of the follower. q the shape of the cam.

Chapter 5: CAM AND FOLLOWER 1. Modes of input/output motion.

Chapter 5: CAM AND FOLLOWER 1. Modes of input/output motion. Rotating cam – oscillating follower

Chapter 5: CAM AND FOLLOWER 1. Modes of input/output motion. Rotating cam – Translating follower

Chapter 5: CAM AND FOLLOWER 1. Modes of input/output motion. Translating Cam-translating follower

Chapter 5: CAM AND FOLLOWER 2. The type of the follower

Chapter 5: CAM AND FOLLOWER 2. The type of the follower Flat faced follower

Chapter 5: CAM AND FOLLOWER 2. The type of the follower

Chapter 5: CAM AND FOLLOWER 3. The arrangement of the follower

Chapter 5: CAM AND FOLLOWER 4. The shape of the cam

Chapter 5: CAM AND FOLLOWER 4. The shape of the cam

Chapter 5: CAM AND FOLLOWER Cam Nomenclature

Chapter 5: CAM AND FOLLOWER Cam Nomenclature

Chapter 5: CAM AND FOLLOWER Cam Nomenclature

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems • As the cam rotates the follower moves upward and downward. • The upward movement of follower is called rise (Outstroke) • The downward movement is called fall (Returnstroke). • When the follower is not moving upward and downward even when the cam rotates, it is called dwell.

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER Design of Cam Systems

Chapter 5: CAM AND FOLLOWER EXAMPLE

Chapter 5: CAM AND FOLLOWER EXAMPLE

PREVIOUS YEAR FINAL EXAM A cam that is designed for Simple Harmonic Motion drives a flat-faced follower. The follower lift for 35 mm; out stroke with SHM (Simple Harmonic Motion) for 900 cam rotation; dwell for 450 cam rotation; return stroke with SHM (Simple Harmonic Motion) for 1200 cam rotation; dwell for the remaining period. Given: base circle radius = 45 mm. Plot the graphs of displacement for the follower. [Plotkan graf sesaran bagi pengikut. ] Sketch the cam profile. [Lakarkan profil sesondol. ] (6 Marks / Markah)

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ASSIGNMENT #2 1. Briefly explain about the gears -Types of gears - Application of each gears - Figure / sketching of the gears 2. Briefly explain about the belt / chain -Types of belt / chain - Application of each belt / chain - Figure / sketching of belt / chain # Handwriting # Using your own words # Submit on before 3 March 2017