Week 9 in-Class Examples - Solutions
Example 1
Determine the allowable tensile force that the
multi-riveted joint shown can transmit. All
rivets are nominally 24 mm in a 26 mm
diameter hole. The design stresses are
all tension 160 MPa ,
P
P
300 mm
all s
Three Posi*on Slider Crank
Design a slider crank mechanism to
move a coupler containing the line AB
through the three positions shown. The
moving pivot (circle point) of the crank
is at A.
Finding the poles
Find the intersec*on of the perpen
Review for exam 2
Sizing a sha4
d3 =
Ma
T
16
+ 3 m
2 K fb nd
SN
Su
Sha4 Design Equa9ons
M=
2
(M y ) + (M z )
2
Ma
Tm
16
d = 2 K fb nd
+ 3
SN
Su
3
Deec9on Based Sha4 Design Equa9ons
For a stepped sha4:
a) Assume
Recitation 8 Power Screws and Threaded Fasteners
Power Screw Example 1
A square-threaded power screw has an outside radius of ro 16 mm and a pitch of 4 mm
with double threads. Knowing that t c 0.08 , rc 20 mm , and W 6.4 kN per
screw;
(a)
(b)
(c)
(d)
Find
Recitation 7 Key and Coupling Examples - Solutions
Key Example 1
A 63.5 mm-diameter shaft is fixed to a gear hub with a
16 16 mm key. The shaft material has yield and allowable
shear stresses of S y 400 MPa and
all S y / 2 200 MPa . The shaft fits into a
Example:
Design a four-bar linkage to generate the function
for values of x between 2
and 5. Use Chebyshev spacing to determine the x- values of these precision points. The
base length of the linkage must be 4.5 inches. Use the following angle information
Design a four-bar linkage to move its coupler (AB) through the three positions shown.
Point B is to be one moving pivot and point X* is to be one fived pivot.
Step 1: Locate fixed pivot B * by extending the perpendicular bisectors of B1B2 and B2 B3
until
Graphical Cam Design
Examples
(811)
(812)
Lay out radial lines from 0
to 360 at 20 degree increments
counterclockwise (since the cam
rotaEon is clockwise).
Draw the base circle and
prime circle.
rp = rb +
You are to design a four bar linkage that will take the coupler AB through the two
positions show. A and B are the moving pivots (circle points). It is desirable to have
a Grashof type 1 linkage where A*A is a crank.
Department of Mechanical and Aerospace