Answered: A screw clamp shown in the figure has a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

A screw clamp shown in the figure has a handle with diameter 5
mm made of cold-drawn AISI 1006 steel (table E18 - page 1195).
The overall length of the hand is 75 mm. The screw is M 12 coarse
(table 8-1) and is 145 mm long, overall. Distance A is 50 mm. The
clamp will accommodate parts up to 105 mm high.
a) What is the value of screw torque that causes the handle to bend
permanently?
b) If the collar friction is neglected and if the thread friction is
0.075, what is the screw force value that causes the handle to
bend permanently?
c) What is the value of clamping force, which will cause the screw
to buckle?
d) Are there any other stresses or possible failures to be checked?
e) If yes, calculate them.

pitch of 4mm with double thread (2 starts), and it is to be used in
an application shown in the figure. The given data include f = fc =
0.08, dc == 40 mm, and F = 6.4 kN per screw.
a) Find the thread depth, thread width, pitch diameter, minor
diameter and lead
b) Find the torque required to raise and lower the load.
c) Find the efficiency during lifting the load.
d) Find the body stresses, tensional and compressive.
e) Find the bearing stress.
f) Find the thread stresses bending at the root, shear at the root,
and principle stress and maximum shear stress at the same
location.
5- A screw clamp shown in the figure has a handle with diameter 5
mm made of cold-drawn AISI 1006 steel (table E18 - page 1195).
The overall length of the hand is 75 mm. The screw is M 12 coarse
(table 8-1) and is 145 mm long, overall. Distance A is 50 mm. The
clamp will accommodate parts up to 105 mm high.
a) What is the value of screw torque that causes the handle to bend
permanently?
b) If the collar friction is neglected and if the thread friction is
0.075, what is the screw force value that causes the handle to
bend permanently?
c) What is the value of clamping force, which will cause the screw
to buckle?
d) Are there any other stresses or possible failures to be checked?
e) If yes, calculate them.
6- A single square-thread power screw has an input power of 3 kW at a speed of 60 rpm. The
screw has a diameter of 36 mm and a pitch of 6 mm. The frictional coefficients are 0.14 for
the threads and 0.09 for the collar, with a collar friction radius of 45 mm. Find the axial
resisting load F and the combined efficiency of the screw and collar.
9/15
2.
COLLEGE OF ENGINEERING & TECHNOLOGY
Department: Mechanical Engineering (Mechatronics)
Lecturer: Dr. Mostafa Rostom
Course Title: Machine Design I
Course Code: ME 356
Title: Fasteners
Sheet No.: 5
1- In the shown hydraulic cylinder, the maximum oil pressure is 6 MPa. The inner diameter A is
120 mm. the flanges width are D=12mm and E=15mm. The dead end flange is fixed by 10
111111111111
...

e with diameter 5
E18 - page 1195).
ew is M 12 coarse
A is 50 mm. The
1.
he handle to bend
thread friction is
ses the handle to
1l cause the screw
s to be checked?
9/15
power of 3 kW at a speed of 60 rpm. The
mm. The frictional coefficients are 0.14 for
friction radius of 45 mm. Find the axial
e screw and collar.
:::

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