Yoke Mechaism

Background of Study

In this laboratory we will investigate the kinematics of some simple mechanisms used to convert rotary motion into oscillating linear motion and vice-versa. Pure simple harmonic motion is produced by the Scotch Yoke mechanism when driven by an eccentric or crank. Scotch Yoke takes a revolution per minute per minute and converts it to a linear velocity.  It can be shown that:

By differentiation:

        Velocity [pic 2]

        Acceleration [pic 3]

Objectives

1. To demonstrate the action of a simple of crank-driven Scotch Yoke mechanism.
2. To determine graphically the relationship between the linear displacement of the Scotch Yoke and the angular displacement of the crank.

Apparatus

Simple crank-driven scotch Yoke mechanism

Procedures

1. Turned the circular ruler clock wise started from 10 until 360°.[pic 4]
2. Displacement is measured at other side of crank-driven have ruler and indicator to shown the length and recorded.
3. When full rotation is turn after that, turned the circular ruler anti clock wise started from 360° until 10°.
4. And recorded.
5. Create a table and graph[pic 5]

Data and analysis

Clock wise

Anti-clock wise