EXPERIMENT NO 4
OBJECTIVE:
To
perform slotted link mechanism
Apparatus:
Crank,
Slider, Connecting Rod, Slotted Link
PROCEDURE:
1.
Set all the equipment for the
experiment of slotted link mechanism.
2.
Adjust the angle of the circle of
the crank at zero degree.
3.
Twist the angle of the circle 20”
and measure linear position of the slider.
4.
Repeat the above process by
increasing 20” of the angle of circle until the angle reaches 360” and each
time measure the resulting distance of the slider.
5.
Plot a graph between linear
position of slider on y-axis and the angle of circle on x-axis.
Theory:
A slotted link mechanism
is a reciprocating
motion
mechanism, converting the linear motion of a slider into rotational
motion, or vice
versa. The piston or other reciprocating part is
directly coupled to a sliding yoke
with a slot that engages a pin on the rotating part. The location of the piston
versus time is a sine wave of constant amplitude, and
constant frequency given a constant rotational speed.
Slotted link:
An
oscillating and rotating link of a crank
mechanism which is provided by a slide way.
Slotted
link mechanism:
A device used in
reciprocating machine to make the return stroke faster than the power stroke.
Simple
Harmonic Motion:
Simple
harmonic motion is defined as when a mass or point moves in such a way that its
acceleration is proportional to its displacement from a fixed point in its path
and is directed to the point, the motion is said to be simple harmonic.
Sr. No
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Angle
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Linear
Position 1
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Linear
Position 2
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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Graph:
Precautions:
Ø All
the apparatus should be in a good condition and work properly.
Ø Each
time, the increased angle of the circle should be of exact 20”.
Ø Read
the linear scale readings carefully.
Application:
Shaper
Machine
The shaper machine is
used to machine flat surfaces especially where a large amount of metal has to
be removed.
In a shaper machine
cutting action takes place while the cutting tool moves in the forward
direction .It does not take cut in backward direction. This is an idle stroke
and time required for this stroke is idle time. To reduce idle time, crank and
slotted link mechanism used.
Piston water pump, with
a scotch yoke connection to its flywheel
This setup is most commonly used in control valve
actuators in high-pressure oil and gas pipelines.
Although not a common metalworking machine
nowadays, crude shapers
can use Scotch yokes. Almost all those use a Whitworth linkage, which gives a slow speed
forward cutting stroke and a faster return.
It has been used in various internal combustion
engines, such as the Bourke engine, SyTech engine, and many hot
air engines and steam engines.
The term scotch yoke continues to be used
when the slot in the yoke is shorter than the diameter of the circle made by
the crank
pin. For example, the side rods of a locomotive may have scotch yokes to permit
vertical motion of intermediate driving
axles
Conclusion:
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