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Course name: - THEORY OF MACHINES
Project on Geneva Mechanism

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

Content
 Introduction
 Parts of Geneva mechanism
 Modelling of Geneva wheel
 Calculation
 Motor
 Advantages & dis advantages
 Application
 Fabrication
 Conclusion

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.

Course Name: - THEORY OF MACHINES
Motion of Mechanism

Parts of Geneva Mechanism
 Drive wheel
 Driven wheel
 Base plate
 Bolt
 Nut
 Bushes

MODELLING OF GENEVA WHEEL

Calculations

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
Problemof Geneva Mechanism

Problemof Geneva Mechanism

Geneva Mechanism

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

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.

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.

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.

APPLICATIONS OF GENEVA

Simple Mechanism

FABRICATION
TURNING
CNC cutting
Welding
DRILLING

CNC Machine

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.

Thanks

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Geneva Mechanism (1 hbhbkjbjbkj'ok).pptx

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