GROUP 14 A C D Mass (g) 22 42 51 21 Eccentric length r (mm) 36 25 34 35 6.1. Use the graphical method to determine the angular position of masses B and c. 6.2. Calculate the position of mass D from support X. 6.3. If the shaft rotates at 150 r.p.m calculate the dynamic force experienced by the bearings.
4. Experimental procedure
4.1. Measure the weight of each mass.
4.2. Measure the eccentric length (r) of each mass.
4.3. Locate mass A at 35 mm from support X.
4.4. Locate mass B at 96.5 mm from support X.
4.5. Locate mass C at 122.7 mm from support X.
4.6. Position mass A at zero degrees and D at 90o
from A.
4.7. Rotate the shaft by hand and release it. As the shaft is released masses should
remain in any angular position.
4.8. Change the angular position of masses B and D till the shaft is statically balanced.
4.9. Rotate the shaft with the motor at high speed and notice the reaction of the system.
High vibration and noise indicate that the system is out of balance.
4.10. Change the position of the mass D till the system is dynamically balanced.
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