CAM. 1.1 CAM - Definition Cams are used to convert rotary motion into reciprocating motion.
Rotary Motion
description
Transcript of Rotary Motion
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Rotary Motion
A Pulley Mechanism uses rotary motion to transmit rotary motion between two parallel shafts.
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Mechanisms using Rotary Motion
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Pulley mechanisms can be used to increase or decrease rotary velocity
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Velocity Ratio Velocity Ratio =
Distance moved by Effort
Distance moved by Load
Velocity Ratio =
Distance moved by the driver pulley
Distance moved by the driven pulley
Velocity Ratio = Diameter of Driven Pulley
Diameter of Driver Pulley
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Velocity Ratio
Pulley Shaft Rotary Velocities can be calculated using the following formula
rotary velocity of driven pulley x diameter of driven pulley =
rotary velocity of driver pulley x diameter of driver pulley
rotary velocity of driven pulley =
rotary velocity of driver pulley x diameter of driver pulley
diameter of driven pulley
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What is the rotary velocity of the driven pulley shaft?
rotary velocity of driven pulley =
rotary velocity of driver pulley x diameter of driver pulley
diameter of driven pulley
= 450 x 3090
revs/min
= 150 revs/min
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Pulleys and Belts
A section through a grooved pulley and
round belt
Vee pulley and section through a vee pulley and belt
Stepped cone pulleys provide a range of shaft speeds
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Flat belts and
pulleys
A section through a flat pulley and belt
Flat belt in use on a threshing
machine
Jockey pulley in use
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Chains and sprockets
Bicycle chain and sprockets
Graphical symbols
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Velocity Ratio = number of teeth on the driven
sprocket number of teeth on the driver sprocket
= 12
36
= 1 : 3
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Example
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Pulleys and Lifting Devices
The pulley
is a form of Class 1 lever
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Movable single pulley
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Pulleys
Velocity Ratio =
Distance moved by Effort
Distance moved by Load
Velocity Ratio = the number of rope sections that support the load
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Two Pulley System
Velocity Ratio =
Distance moved by
Effort
Distance moved by
Load
Velocity Ratio =
2x
x
Velocity Ratio = 2:1
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Four Pulley System
Velocity Ratio =
Distance moved by
Effort
Distance moved by
Load
Velocity Ratio =
4x
x
Velocity Ratio = 4:1
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Cams
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Cams
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Uses
Pear shaped cams are used in valve control mechanisms
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Cams used in a four
cylinder engine
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Cam motions
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Types of cam follower
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Types of cam follower
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Springs are used to keep the follower in contact with the cam
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Cam Profiles
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Displacement graph for a pear shaped cam
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Displacement Graphs
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Bearings
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Thrust Bearings
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Bearings
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Bearings
• Bronze• Nylon• PTFE• Air• White metal• Cast Iron• Sintered
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Gears
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Gears
Gears are not only used to transmit motion. They are also used to transmit force.
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Gears
Mechanical Advantage =
Number of teeth on the driven gear
Number of teeth on the driver gear
Velocity Ratio = Gear Ratio =
Number of teeth on the driven gear
Number of teeth on the driver gear
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Gears
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Gears
Gear Ratio =Product of teeth on the driven gearsProduct of teeth on the driver gears
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Gears
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Gears
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Gears
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Gears
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Basic Gear Geometry
http://www.sdp-si.com/D190/PDF/D190T25.PDF
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The inclined plane
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The inclined plane
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The inclined plane
Effort required to pull trolley up slopeF = effort E
F = 1000 x sin
F = 1000 x 0.01F = 10N
E = 10N
sin = 1/100 = 0.01
M.A. = 1000/10 = 100
Follow link to see effects of steeper incline:http://lectureonline.cl.msu.edu/~mmp/applist/si/plane.htm
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The screw thread
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Screw thread terms
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Screw thread forms
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Screw thread forms
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Screw thread forms
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B.S. PD7308
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Newton’s Laws
• First Law– A body continues in its state of rest or uniform
motion in a straight line unless compelled by some external forces to change that state.
(sometimes know as the law of inertia)
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Newton’s Laws
• Second Law– Rate of change of momentum is proportional to
the applied force and takes place in the direction in which the force acts.
(Continued force means continued acceleration)
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Newton’s Laws
• Third Law– To every action there is an equal and opposite
reaction