1. PROJECT REPORT ON :
G e n e v a M e c h a n i s m
Submitted by :
Group(21)
• Mohamed Fathy Mubarak
• Mohamed Abdel- monem
• Mohamed Mahrous Hanfy
• Mohamed Nasr Ibrahim
Guide by :
• Dr.Wesam Farouk
• Eng. Mohamed Elshamy
5/10/2024
2. INTRODUCTION
• The Geneva drive is a gear mechanism that 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 advancing it by one step. The drive wheel also has a
raised circular blocking disc that locks the driven wheel in position between steps.
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8. Calculations
Geneva gear auto calculating site
this site is amazing! Through this site we can easily calculate Geneva gear parameters and check the
motion(animation).
http://benbrandt22.github.io/genevaGen/
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13. CRITERIA FOR SELECTION OF MATERIAL:
The material for different components was selected by assessing tensile strength
and modulus, flexural strength and modulus, impact strength, compressive strength,
fatigue endurance, creep, and stress-relaxation properties depending on the
application. This ensures that design will work efficiently without any probability of
failure. However, unexpected conditions like being subjected to a higher load than
expected or being damaged by a chemical can affect the system. Furthermore, the
cost factor is also very important in selecting material.
14. 1. Frame/Stand:
Purpose:
This is the part which bears the load of all other components as they are mounted
on it. The frame material must have the capability to endure the load and offer
minimum deformation
Material:
Steel 37
15. 2. Geneva Mechanism:
It will consist of a Drive Wheel and a Driven wheel.
Purpose:
It will change continuous circular motion into fixed step circular motion. The rest of its
mechanism has been explained earlier.
Material:
Steel 37
16. 3. 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
18. APPLICATIONS
1. Modern film projectors may also use an electronically controlled indexing
mechanism or stepper motor, which allows for fast-forwarding the film.
2. Geneva wheels having the form of the driven wheel were also used in
mechanical watches, but not in a drive, rather to limit the tension of the spring,
such that it would operate only in the range where its elastic force is nearly
linear.
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20. ADVANTAGES
Maintains good control of its load at
all times.
Low cost.
Saves Man Power.
Saves time.
Easy setup in an industry.
Does not require stepper motor.
21. DISADVANTAGES
Very difficult to change timing
once design is chosen.
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.
