mechnical jack

Topics: Screw thread, Screws, Screw Pages: 56 (16255 words) Published: June 28, 2014
DESIGN AND FABRICATION OF MOTORIZED SCREW JACK
FOR A FOUR WHEELER
A PROJECT REPORT
Submitted in partial fulfillment for the award of the Diploma of Polytechnic
IN
MECHANICAL ENGINEERING
By
Shashank Thakur
Amarjeet Singh
Nitish Bhardwaj
Prashant Bhardwaj
DEPARTMENT OF MECHANICAL ENGINEERING
Vtech Institute of Intergrated Technology,
(Affiliated To Uttar Pradesh Board Of Technical Education,Lucknow) Sunhaira,Bulandshahr -Khurja Road,Bulandshahr-203001

DEPARTMENT OF MECHANICAL ENGINEERING
Vtech Institute Of Intergrated Technology,Bulandshahr
(AFFILIATED TO Uttar Pradesh Board Of Technical Education)
Lucknow.
CERTIFICATE
This is to certify that this project entitled “design and fabrication of motorized screw jack for a four wheeler” is a bonafide work carried out by Shashank Thakur,Amarjeet Singh,Nitish Bhardwaj and Prashant Bhardwaj during the period 2013-2014 in partial fulfillment of the requirements for the award of Diploma of “Polytechnic" in Mechanical Engineering” from Vtech Institute Of Intergrated Technology, Bulandshahr affiliated to Uttar Pradesh Board Of Technical Education Lucknow,under our guidance and supervision. The results embodied in the project work have not been submitted to any other University or Institute for the award of any degree or diploma. Mr.Arvind Sagar and Mr. Vikrant

PROJECT GUIDE PROJECT HEAD
(Associate professor, Mech dept.) (Professor, Mech dept.)
VIIT
Mr.Nikhar
(HOD)
MECHANICAL DEPT.
GRIET

ACKNOWLEDGEMENT
This project would have been a distant reality if not for the help and encouragement from various people. We take immense pleasure in thanking Dr.Vijay Kaushik Director, Vtech institute Of Intergrated Technology,Bulandshahr for having permitted us to carry out this project work. We wish to express our deep sense of gratitude to Mr.Nikhar, HOD,VIIT, Mr. Arvind sagar, Professor, Mechanical Engineering Department, VIIT and our project guide Mr.Vikrant, Associate Professor, Mechanical Engineering Department, VIIT for their able guidance, encouragement and useful suggestions, which helped us in completing the project in time. We would also like to mention Western Powers and Engineering Works, Bulandshahr for their encouragement and cooperation in carrying out the project work. Finally, yet importantly, I would like to express my heartfelt thanks to my beloved parents for their blessings, my friends for their help and wishes for the successful completion of this project. Shashank Thakur

Amarjeet Singh
Nitish Bhardwaj
Prashant Bhardwaj

NOMENCLATURE
p - Pitch of screw thread (mm)
l - Lead of screw thread (mm)
d - Nominal diameter of screw (mm)
dc - Core diameter of screw (mm)
dm - Mean diameter of screw
α - Helix angle of screw (degree)
W - Load (kg)
N - Normal reaction
μ - Coefficient of friction
P - Effort (N)
θ - Friction angle (degree)
T - Torque (N.m)
η - Efficiency (%)
Fc - Direct compressive stress (N/mm2)
Ft - Torsional shear stress (N/mm2)
Fs - Principal shear stress (N/mm2)
Ts - Transverse shear stress (N/mm2)
t - Thread thickness at the core diameter (mm)
n - Number of threads in engagement with the nut.
Tn - Transverse shear stress at the root of the nut (N/mm²) Pb - Unit bearing pressure (N/mm²)
k - Least radius of gyration of the cross-section about its axis (mm) I - Least moment of inertia of the cross-section (mm4)
A - Area of the cross-section (mm2)
Pcr - critical load (N).
E - Modulus of elasticity (N/mm²)
Syt - Yield strength of the material (N/mm2)
M - Maximum bending moment at the critical section
WT - Tangential load acting at the tooth (N)
h - Length of the tooth (mm)
y - Half of the thickness of the tooth (t) at critical section (mm) b - Width of gear face (mm)
Fw - Permissible working stress
y - Lewis form factor
Fo - allowable static stress (N/mm2)
Cv - velocity factor.
v - Pitch line velocity (m/s.)
WD - Total dynamic load (N)
WT...
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