Mechanics of Machines - Experiment 3
- 1. JJ508 ENGINEERING LABORATORY 3 MECHANICS OF MACHINE EXPERIMENT 3 STATIC AND DYNAMIC BALANCING
- 2. At the end of the lab session students should be able: i. To demonstrate a simple balancing technique for static balance. ii. To draw a force polygon diagram. Experiment Outcome
- 3. i. Static and dynamic balancing apparatus ii. Set of weights iii. Protractor iv. Allen key set Apparatus/Equipment
- 4. Apparatus/Equipment LEGEND A - Safety Acrylic Cover B - Weight Piece C - Circular Rod D - Belt Pulley with Belt E - Spring Damper F - Fuse G - ON/OFF Switch H - Motor ON/OFF and Speed Controller I - Digital Speed Display Meter
- 5. Ensure the main switch (G) of the apparatus is switched OFF when conducting the experiment. Remove the safety acrylic cover (A). Remove the belt from the pulley (D). Loosen the screw of the weight pieces (B) using the Allen key. Arrange all the weight pieces in a line where all the angles of the weight pieces are identical to each other. Tighten the weight pieces. Rotate the shaft to 90°. Release the weight pieces and make the observation. Procedures
- 6. From the table provided, calculate the unbalanced moment that makes the system unstable. Arrange the workpiece along the circular rod (C). Set the angle to 0° for the first mass and 60° for the second mass. Arrange the other two masses to balance the system. Rotate the weight pieces and release it. Observe the system. If the system is balance, it should not rotate after it is released. Draw the force polygon diagram for the system. Procedures
- 7. Result/Data Record the data obtained Mass (kg) Radius (m) θ (°) Mr (kgm) 1 2 3 4 Total
- 8. i. Why does the balancing of forces must be perform at any rotating machinery or shaft? ii. Differentiate static and dynamic balance. Discussion
- 9. Give your comments based on the results obtained. Conclusion and Recommendation