Quick return mechanism

1. Yadash S Bankay
EMT- 1220
Experiment No. 3 Quick Return Mechanism
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QuickQuickQuick
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2. Table Of content
Cover Page …………………………………………………………………………………..1
Table of Content…………………………………………………………………………..2
Objective………………………………………………………………………………………3
Procedure…………………………………………………………………………………….4
Quick Return Mechanism…………………………………………………………..6-8
Link length vs Stroke…………………………………………………………………….9
Conclusion…………………………………………………………………………………..10
Question…………………………………………………………………………………..11-12
Internet Research
Crank Shaper Mechanism…………………………………………………………….13
Quick Return Link…………………………………………………………………………14
Klann (Walking) linkage ……………………………………………………………….15
Double Parallel Crank …………………………………………………………………..16
Crest Spin Electric Toothbrush ……………………………………………………..17
Inductive Charging………………………………………………………………………..18
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3. Objectives
In this experiment, we will construct a quick return mechanism in order to
transform uniform rotation motion on the crank into oscillatory motion of the
follower link and linear reciprocating motion of the slider. In other words, the
output motion, L R (Left to Right) or R L (Right to Left) will be visible faster
than the other one. In addition, by altering the link lengths one at a time we will
measure the slider stroke effect, also we are going to plot a graph of the crank
angle versus the slider displacement going clockwise and counterclockwise of the
crank motion which will be done on a computer. Moreover, we will be able to
analyze the degrees crank rotation to determine where the slider will have zero
linear velocity and where the slider will have Maximum Linear Velocity using
physics terms.
Procedure
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4. The breadboard were on the workbench in a vertical position in order to easily
make adjustments. They were three fix pivots, one pivot with dial and two sliding
pivots. I assembled the first fixed pivot with the dial in the center of the bread
board, and the second pivots at the right extreme and one to the left extreme.
Quick Return Starting Position
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Extreme
Left
Extreme
Right
Slider
Couple
Follower
Ground
Stroke
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5. Page 5 of 18
Extreme Right
Extreme Left
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6. Page 6 of 18
Coupler
Slider
Follower
Ground
Extreme
Right
Extreme
Left
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7. Quick Return Mechanism
In this experiment, we were required to take data to conform that this is a quick
mechanism and how to record the data. I measure the crank angle Vs the slider
displacement, starting from zero degrees and increase it 20 ͦ at a time, the I
record the data into excel.
Crank Angle Vs Slider Displacement
Crank
Angle
CW
(Inches)
CCW
(Inches )
Crank
Angle
CW
(Inches)
CCW (Inches
)
0 0 0 200 3.45 3
20 0.125 0.125 220 2.9 2.5
40 0.375 0.5 240 2.25 2
60 0.875 1 260 1.975 1.5
80 1.25 1.5 280 1.5 1
100 1.875 2.1 300 0.875 0.5
120 2.25 2.5 320 0.375 0.3875
140 2.75 2.9 340 0.125 0.125
160 3.25 3.5 360 0 0
180 3.625 3.4
The data was plot using excel graph to analyze the crank angle X-axis Vs the slider
displacement Y-axis clockwise and counterclockwise.
0 50 100 150 200 250 300 350 400
0
0.5
1
1.5
2
2.5
3
3.5
4
Crank Angle vs Slider Displacement
Crank Angle Vs Slider Displacement CW (Inches)
Moving average (Crank Angle Vs Slider Displacement CW (Inches))
Crank Angle Vs Slider Displacement CCW (Inches )
Slider Displacement inches "
Crank Angle (Degrease)
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8. 0 50 100 150 200 250 300 350 400
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.13
0.38
0.88
1.25
1.88
2.25
2.75
3.25
3.63
3.45
2.9
2.25
1.98
1.5
0.88
0.38
0.13 0
Crank Angle Vs Slider Displacement
ClockWise
Slider Displacement CW"
Crank angle (Degrease)
0 50 100 150 200 250 300 350 400
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.13
0.5
1
1.5
2.1
2.5
2.9
3.5 3.4
3
2.5
2
1.5
1
0.5 0.39
0.13 0
Crank Angle Vs Slider Displacement
Counterclockwisw
Slider Displacement CCW"
Crank angle (Degrease)
As we can see from the diagram above that the length of the crank increase, also
there was an increase in the stroke. It is the same aspect for the counts for the
ground as long as it increase we can see that the stroke also increase.
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9. Link lengths Vs Stroke
A) As the length of the crank line increase the length of the stroke increase
B) As the length of the ground decreases, the length of the stroke increase
Alpha α 180 ͦ
Beta 360 ͦ- 160 ͦ=200 ͦ
Time Ratio= 200/160= 1.25 Second
Stroke = 4 22/32
Conclusion
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Crank
(Inches) "
Ground
(Inches) "
Stroke
(Inches) "1 1/8 4 4 1/2
1 3/8 4 5 1/2
1 3/8 3 1/4 6 1/2
1 3/8 3 1/4 6 1/2
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10. In this experiment, we learn how to construct a quick return linkage to
transform uniform rotation motion of the crank into oscillatory rocking
motion of the follower link and liner reciprocating motion of the slider.
Inclusion, the lab was successful and we have seen that the slider has
higher velocity moving to the right to left.
Questions
1. The constant angular velocity crank is transform into oscillatory motion for
the follower link; also the slider has a linear reciprocating motion.
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11. 2. The time ratio implies that the back and forth slider motion is meant to
determine clockwise and counterclockwise which will always be faster than
the forward motion since Beta cannot be greater than or equal to the slider.
3. The change of direction for the slider from clockwise to counterclockwise is
that the slider value goes up. when the it is flip it is like a mirror image of
one another.
0 50 100 150 200 250 300 350 400
Crank Angle vs Slider Displacement
Crank Angle Vs Slider Displacement CW (Inches)
Moving average (Crank Angle Vs Slider Displacement CW (Inches))
Crank Angle Vs Slider Displacement CCW (Inches )
Slider Displacement inches "
Crank Angle (Degrease)
4)
0 50 100 150 200 250 300 350 400
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.13
0.38
0.88
1.25
1.88
2.25
2.75
3.25
3.633.45
2.9
2.25
1.98
1.5
0.88
0.38
0.13 0
Crank Angle Vs Slider Displacement
ClockWise
Slider Displacement CW"
Crank angle (Degrease)
5) The slider have maximum velocity at 280 ͦ and have zero velocity at 240 ͦ.
In addition, the slider higher velocity move from right to left that is because
our crank was between 280 ͦ - 300 ͦ
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12. 6.) The slider crank mechanism and the four bar linkage had graphs that
were symmetrical and have two points of maximum velocity. In addition,
the Four bar linkage and the quick return mechanism graph is not parabola.
Internet Research
1. Crank Shaper Mechanism
The shaping machine is used to machine flat metal surfaces especially
where a large amount of metal has to be removed. Other machines such as
milling machines are much more expensive and are more suited to removing
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13. smaller amounts of metal, very accurately. The reciprocating motion of the
mechanism inside the shaping machine can be seen in the diagram. As the
disc rotates the top of the machine moves forwards and backwards, pushing
a cutting tool. The cutting tool removes the metal from work which is
carefully bolted down.
2. Quick Return linkage -In mechanical design, the designer often has need of a
linkage that provides a certain type of motion for the application he/she is designing.
Since linkages are the basic building blocks of almost all mechanisms, it is very
important to understand how to design linkages for specific design
characteristics.https://www.softintegration.com/chhtml/toolkit/mechanism/fou
rbar/fourbarQuickReturn.html.
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14. 3. The Klann linkage is a planar mechanism designed to simulate the gait of legged animal
and function as a wheel replacement. The linkage consists of the frame, a crank, two
grounded rockers, and two couplers all connected by pivot joints.The proportions of each
of the links in the mechanism are defined to optimize the linearity of the foot for one-half
of the rotation of the crank. https://en.wikipedia.org/wiki/Klann_linkage
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15. Double Parallel Crank- A parallelogram system allows a movement similar output
to the input movement
4.
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16. 5. Crest spin Electric Toothbrush
The Crest spin electric toothbrush use a 1.5v battery with and electric
motor to move a four bar linkage in the toothbrush in order to rotate in
the middle of the toothbrush to rotate the brush the top. The spin brush
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17. pro use a slider crank linkage for the removable
brush.http://kmoddl.library.cornell.edu/leonardo/
6.) Inductive charging (also known as wireless charging) uses an electromagnetic
field to transfer energy between two objects. This is usually done with
a charging station. Energy is sent through an inductive coupling to an electrical
device, which can then use that energy to charge batteries or run the device.
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18. Page 18 of 18
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