systems and control (motion and linkages)

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Linear motion
linear motion is movement in a straight line in one direction
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Reciprocating motion
Reciprocating motion is moving backwards and forwards in a straight line, as in cutting with a saw.
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Rotary motion
Rotary motion is turning round in a circle, such as a wheel turning
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Oscillating motion
Oscillating motion is swinging from side to side, like a pendulum in a clock.
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Load
the wheight or mass that is supported or moved by a mechanism
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Effort
the import force applied to the mechanism if the mechanism has a mechanical advantage , the distance moved by the effort will be greater than the distance moved by the load
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Fulcrum
in a lever mechanism , the pivot about which the lever turns is known as the fulcum . The position of the fulcrumb relative to the to the load effort will determine the class of lever
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Torque
this is the turnimg force in a mechanism . high force means that there is a lot of force in the rotation
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Friction
this can be defined as a force resisting the relative motion of two surphaces
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Mechanical Advantage
this is simply defined as load divided by effort or output force divided by input divorce
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Velocity Ratio
the distance over which the force is applied divided by the distance over which load is moved
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Efficiency
this is a percentage , given by the formula : Machanical Advantage /Velocity Ratio or MA/VR
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Linkages
Linkages are mechanisms which allow force or motion to be directed where it is needed. Linkages can be used to change:
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reverse motion linkage
A reverse-motion linkage changes the direction of motion.the central rod moves around a central fixed pivot. By pulling (or pushing) the linkage in one direction, it creates an exact opposite motion in the other direction.
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parallel linkages
parallel-motion linkage creates an identical parallel motion.it is the two side rods that move around two central fixed pivots, while the top of the "n" moves freely. By pulling the linkage in one direction, it creates identical motion.
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toggle clamps
these are used to produce locking mechanisms
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treadle linkage
treadle linkage shows how linkages can be used to change one type of motion into another. In this case, the rotary motion of the cam moves a parallel-motion linkage
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Other cards in this set

Card 2

Front

Reciprocating motion is moving backwards and forwards in a straight line, as in cutting with a saw.

Back

Reciprocating motion

Card 3

Front

Rotary motion is turning round in a circle, such as a wheel turning

Back

Preview of the back of card 3

Card 4

Front

Oscillating motion is swinging from side to side, like a pendulum in a clock.

Back

Preview of the back of card 4

Card 5

Front

the wheight or mass that is supported or moved by a mechanism

Back

Preview of the back of card 5
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