Geneva Mechanism (1 hbhbkjbjbkj'ok).pptx

ىتىتىتىنىممنة م

1. Course name: - THEORY OF MACHINES Project on Geneva Mechanism

2. Course name: - THEORY OF MACHINES Group 16 members Youssef Abdelmoneim Youssef Sameh Ibrahim Nour Atef Abdel Sattar Menna Ashour Afifi Nada Ahmed Hamza Supervised by : Dr.Wesam Farouk Eng. Mohamed El- sayed

3. Course name: - THEORY OF MACHINES Content Introduction Parts of Geneva mechanism Modelling of Geneva wheel Calculation Motor Advantages & dis advantages Application Fabrication Conclusion

4. Course name: - THEORY OF MACHINES INTRODUCTION The Geneva Mechanism Translates a Continuous rotation into an intermittent rotary motion. The Rotating drive wheel has a pin that reaches into a slot of the driven wheel. The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps.

5. Course Name: - THEORY OF MACHINES Motion of Mechanism

6. Course name: - THEORY OF MACHINES Parts of Geneva Mechanism Drive wheel Driven wheel Base plate Bolt Nut Bushes

7. Course name: - THEORY OF MACHINES MODELLING OF GENEVA WHEEL

8. Course name: - THEORY OF MACHINES MODELLING OF GENEVA WHEEL

9. Course name: - THEORY OF MACHINES Calculations

10. Course name: - THEORY OF MACHINES A Geneva mechanism has been designed with six stations, as shown in Figure 9.37. The distance between the driving and driven shafts is 80 mm. The driving arm rotates at a constant rate of 80 rpm clockwise. Determine the angular velocity and acceleration of the wheel when the driving arm has rotated 15° from the position where the roller has just entered the slot. 1.Calculate Geneva Geometry2.Calculate Geneva Kinematic Properties Problem of Geneva Mechanism

11. Course name: - THEORY OF MACHINES Problem of Geneva Mechanism

12. Course name: - THEORY OF MACHINES Problem of Geneva Mechanism

13. Course name: - THEORY OF MACHINES Problem of Geneva Mechanism

14. Course name: - THEORY OF MACHINES Geneva Mechanism

15. Course name: - THEORY OF MACHINES 12V DC motor Purpose: A DC motor is a device to convert electrical energy input to mechanical/kinetic energy output via a simple mechanism that uses magnetic field and electricity to produce a torque. The DC motor will be connected to the Geneva drive wheel, causing it to rotate due to the torque produced in it. We can control the rotation speed of the Geneva Drive wheel by varying the supplied Voltage . Greater the voltage, greater the speed of rotation

16. Course name: - THEORY OF MACHINES Advantages Geneva Mechanism may be the simplest and least Expensive of all intermittent Motion Mechanisms. They come in a wide Variety of sizes , ranging from those used in instruments , to those used in machine tools to index spindle carriers weighing several tons. They have good motion curves characteristics compared to ratches, but exhibit more “jerk” or instantaneous change in acceleration , than better cam systems. Geneva Mechanisms good control of its load at all times ,since it is provided with locking ring Surfaces.

17. Course name: - THEORY OF MACHINES DIS ADVANTAGES The Geneva is not a versatile Mechanism. The ratio of dwell period to motion is also established Once the no of dwells per revolution has been Selected. All Geneva Acceleration Curves start with Finite Acceleration & Deceleration. This means they produce jerk.

18. Course name: - THEORY OF MACHINES APPLICATIONS OF GENEVA Stepper Mechanical Watches Plotters CNC Machine Iron ring clock Modern film projectors may also use an electronically controlled indexing mechanism or stepper motor, which allows for fast –forwarding the film. Indexing tables in assembly lines tool changes for CNC machines and so on.

19. Course name: - THEORY OF MACHINES APPLICATIONS OF GENEVA

20. Course name: - THEORY OF MACHINES APPLICATIONS OF GENEVA

21. Course name: - THEORY OF MACHINES Simple Mechanism

22. Course name: - THEORY OF MACHINES FABRICATION

23. Course name: - THEORY OF MACHINES CNC Machine

24. Course name: - THEORY OF MACHINES CONCLUSION The parts namely GENEVA WHEEL , rotator and baseplate were modeled using UNIGRAPHICS-NX 9.0 cad software and subsequently CNC coding were developed manually. The parts mentioned above were fabricated using conventional , lathe , milling and drilling machines. Next stage of the process was carried out using CNC vertical machining center to achieve the near to finish dimensions and later the parts were finished using flat file and emery sheet. Finally, The parts (Geneva Wheel ,Rotator) were assembled to the baseplate using fasteners (bolt and Nut) to complete the Geneva wheel Mechanisms.

25. Course name: - THEORY OF MACHINES Thanks