Machine and Mechanisms
Introduction to mechanisms and
It is the study of motion (relative motion of different links), quite apart
from forces which produce that motion. More particularly, kinematics
is the study of position, displacement, rotation, speed, velocity and
acceleration which arise in the design of mechanical system, or
kinematics of machine.
Position, displacement, rotation, speed, velocity, acceleration
Geometry dimensions of the mechanism
Power capacity, stability, member load
Planar mechanism – motion in 2D space
Machines and mechanisms
Oxford dictionary: an apparatus for applying mechanical power,
consisting of a number of interrelated parts each having a
Devices used to alter, transmit, and direct forces to accomplish a
Mechanical advantage is sole object of a machine e.g. lathe, shaper,
Let's make a simple mechanism with similar behavior. Take
some cardboard and make four strips as shown in.
Take 4 pins and assemble them as shown in fig
Now, hold the 6in. strip so it can't move and turn the 3in.
strip. You will see that the 4in. strip oscillates.
A rigid body contains only
A rigid body contains more
than two joints
Point of interest
A power source link