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Title: Slider Crank Mechanism
Aim:
Apparatus:
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THEORY:
**GENARAL**
The
Slider-crank mechanism is used to transform rotational motion into
translational motion by means of a rotating driving beam, a connection rod and
a sliding body. In the present example, a flexible body is used for the
connection rod. The sliding mass is not allowed to rotate and three revolute
joints are used to connect the bodies. While each body has six degrees of
freedom in space, the kinematical conditions lead to one degree of freedom for
the whole system.
A slider
crank mechanism converts circular motion of the crank into linear motion of the
slider. In order for the crank to rotate fully the condition L> R+E must be
satisfied where R is the crank length,L is the length of the link connecting
crank and slider and E is the offset of slider . A slider crank is a RRRP type
of mechanism i.e. It has three revolute joints and 1 prismatic joint. The total
distance covered by the slider between its two extreme positions is called the
path length. Kinematic inversion of slier crank mechanisms produce an ordinary
quick return mechanism.
When the
driving torque rotates the rigid body in a circular motion, the felixible beam
which is connected by a revolute joint causes the sliding mass to move in a
to-and-fro direction.
DIAGRAM
A crank is an arm attached at right angles to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to convert circular motion into reciprocating motion, or vice versa. The arm may be a bent portion of the shaft, or a separate arm or disk attached to it. Attached to the end of the crank by a pivot is a rod, usually called a connecting rod. The end of the rod attached to the crank moves in a circular motion, while the other end is usually constrained to move in a linear sliding motion.
The term often refers to a human-powered crank which is used to manually turn an axle, as in a bicycle crankset or a brace and bit drill. In this case a person's arm or leg serves as the connecting rod, applying reciprocating force to the crank. There is usually a bar perpendicular to the other end of the arm, often with a freely rotatable handle or pedal attached.
For
Procedures, See your Mechanical Laboratory Manual.
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Observations
:-
1.
Applications:-
1.
PRECAUTIONS:
For Precautions, See General Laboratory Precautions
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