1. Motion transmission element in machine tools

2. Belt drive
Lab6: Roundness Test
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3. Open belt drive
Lab6: Roundness Test
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4. An open belt drive is used to rotate the driven pulley in the same direction of driving pulley. In the motion of belt drive, power transmission results make one side of pulley more tightened compared to the other side. In horizontal drives, tightened side is always kept on the lower side of two pulleys because the sag of the upper side slightly increases the angle of folding of the belt on the two pulleys.
Lab6: Roundness Test
9/20/2018

5. Cross belt drive
Lab6: Roundness Test
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6. A crossed belt drive is used to rotate driven pulley in the opposite direction of driving pulley. Higher the value of wrap enables more power can be transmitted than an open belt drive. However, bending and wear of the belt are important concerns.
Lab6: Roundness Test
9/20/2018

7. Advantages Belt drives are simple and economical.
They don’t need parallel shafts.
Belts drives are provided with overload and jam protection.
Noise and vibration are damped out. Machinery life is increased because load fluctuations are shock-absorbed.
They are lubrication-free. They require less maintenance cost.
Belt drives are highly efficient in use (up to 98%, usually 95%).
They are very economical when the distance between shafts is very large.
Lab6: Roundness Test
9/20/2018

8. Disadvantages
In Belt drives, angular velocity ratio is not necessarily constant or equal to the ratio of pulley diameters, because of slipping and stretching.
Heat buildup occurs. Speed is limited to usually 35 meters per second.
Power transmission is limited to 370 kilowatts.
Operating temperatures are usually restricted to –35 to 85°C.
Some adjustment of center distance or use of an idler pulley is necessary for wearing and stretching of belt drive compensation
Lab6: Roundness Test
9/20/2018

9. Change speed by pulley
Lab6: Roundness Test
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10. Other arrangement
Lab6: Roundness Test
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11. Lab6: Roundness Test
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12. Pulley application Drilling machine Machine transmission elements
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13. Gear transmission
Lab6: Roundness Test
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14. Simple gear train
Lab6: Roundness Test
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15. Gear transmission with the same direction
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16. Compound gear train
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17. Lab6: Roundness Test
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18. Rack and pinion
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19. Lathe gear train
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20. Lab6: Roundness Test
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21. Motion elements in Lathe
Lab6: Roundness Test
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22. Main drive
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23. Feeding mechanism
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24. Schematic diagram in lathe
Lab6: Roundness Test
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25. Thread cutting arrangement in lathe
Lab6: Roundness Test
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26. Lab6: Roundness Test
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27. Apron Mechanism
Lab6: Roundness Test
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28. Lab6: Roundness Test
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29. Lab6: Roundness Test
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30. Half nut mechanism
Lab6: Roundness Test
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31. Lab6: Roundness Test
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32. Lab6: Roundness Test
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33. Rotary to linear motion
Lab6: Roundness Test
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34. Slider crank mechanism
Lab6: Roundness Test
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35. Lab6: Roundness Test
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36. Quick return mechanism
Shaper
Lab6: Roundness Test
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37. Lab6: Roundness Test
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38. Lab6: Roundness Test
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39. Lab project
Lab6: Roundness Test
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40. Speed ratio
Lab6: Roundness Test
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41. Coupling
Lab6: Roundness Test
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