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Mechanisms (Mechanisms (Classification (transforming motion (rotary to…

- - - - As you can see, hey have diverse uses.
        
        telling the time
        
        entertaining children in the park
        
        transporting people from A to B
        
        lifting and carrying objects
  - - - rotary to linear
      - rotary to reciprocating
    - - linear
      - rotary
- - - - This consists of a bolt or threaded bar and a nut that has the
        same intenor diameter as the diameter of the bolt.
    - - A winch and crank handle system consists of a drum that rotates and a crank handle that allows to pull or lift objects.
      - A crank is a bar attached to an axle that is used to turn it
      - A winch is balanced when it satisfies this equation: F·d=R·r
    - - This uses a pinion that is a small cogwheel, mounted on a rack
        that is a toothed belt or bar
        
        The ratio between the number of rotations of the pinion and the veloaty of
        the movement of the rack is expressed by this equation: L=P·N·Z
        
        Uses: bench dolls, corkscrews, vehicle steenng
  - - - This is a set of connecting rods attached to a jointed axle. Each of
        the joints of the axle acts as a crank.
      - It can also transform the reciprocating motion of the rods into a rotary motion of the axle : Uses:combustion engines and sewing machines
    - - This is basically a rotaring object that pushes a follower as it moves
        
        We can change the shape and the usable profiles — the outside edge of the piece -that are more or less pointed to produce more complex movements.
        
        A cam transforms rotary motion
        into reciprocating motion in the follower or bar.
    - - This is composed of a crank and a rod called a connecting rod or link.
        
        This crank-link-slider system can work in reverse — it can transform
        reciprocating motion or oscillating motion into rotary motion.
      - Uses: internal combustion engmes, windscreen wipers and machine tools
    - - This consists of a wheel with an
        off-centre rotation axle
        that doesn't coincide with the centre of its ircumference
      - It transforms the rotary motion of thewheel into reciprocating motion m the follower
- - - - A fixed pulley
        is balanced when the effort F is equal to the resistance of the load,R.
    - - A moveable pulley to a set of two pulleys — one to fixed while the other can move to a linear direction.
        
        A moveable pulley is balanced when it satisfies this equation F=R:2
    - - The following equauonmdicates a balanced lever:
        F·d=R·r
    - - this is a system of fixed and movleable pulleys,often called block and tackle.
        
        Uses; lifts, goods lifts and cranes.
- - - - This is a screw that moves a helical cogwheel that is set perpendicular to the screw
    - - These are two cogwheels with parallel axels thatare a certain distance apart, they rotate simultaneously by means of a metal chain or a toothed belt streched over both wheels.
        
        The chain transmits the rotary mouon of axle I to axle 2 by means of gears I and 2, and the two gears rotate in the same direction.
      - The relation between the rotation veloaties of the wheels depends on the number of teeth on each gear
      - Uses: industnal machinery, engines and motors, bicycles, motorbikes
        and three-wheeled vehicles.
    - - Cogwheels are sets of wheels that have teeth called cogs.
        
        Gears can be cylindncal or conical.
        
        CONICAL
        
        CYLINDRICAL
    - - This is a system of more than two gears, connected together as shown in
        the diagram
        
        The rotary motion of the first wheel drives the second wheel and so on
        
        In this system, the rotary movement of the first axle is transmited to the second by means of wheels 1 and 2
        
        Wheel 3 rotates with the same velocity as wheel 2 and doves wheel 4, to
        which it's connected
    - - They consist of two pulleys or wheels that are a certain distance apart.
      - The rotation of one axle is transmitted to the other through the
        connected pulleys.
      - Uses:
        industnal machines, vehicle engines, washing machines and drills
      - Their axles are parallel and they rotate simultaneously due to the effect of the belt.
    - - he ratio between the rotation veloaty of the wheels or pulleys
        depends on the relative size of the wheels.
        It is expressed by the followmg equation:
        N , D, = N, D r '