students ppts about mechanisms

2. INDEX
1. INTRODUCTION
2. MECHANISM
3. DEFINITION
4. CLASSES
5. MATHEMATICAL PROBLEMS
6. ANIMATION

3. INTRUDUCTION

4. MECHANISM
Thanks to the mechanism of this simple
tool, we can move heavy objects using a
small force and a fulcrum.
This is composed of a rigid bar that can
rotate freely around a point of support called
fulcrum.
This mechanism works if there’s one
part doing resistence and the other
making the effort.

5. DEFINITION
The lever is a simple machine whose
function is to transmit force and vary
displacement.
It can be used to amplify the mechanical
force that is applied to an object, to increase
its speed or distance traveled, in response to
the application of a force.

6. CLASSES

7. MATHEMATICAL PROBLEM
 LAW OF THE LEVER
 Formula:

8. Paula Lombas Zapatero
Ainhoa Rodríguez Obregón

9. MECHANISMS
( devices that transmit
and transform motion )
Transmitting
motion
Transforming
motion
Linear
transmission
Rotary
transmission
Levers
Pulleys

10. A pulley is simply a collection of one or
more wheels over which you loop a rope
to make it easier to lift things.
PULLEYS
COMPOUND
MOVABLE
FIXED

11. A fixed pulley is a simple machine
that uses a wheel with a groove. The
other end of the rope attaches to a
load, or the object you’re needing to
move.
F = L

12. A flag pole is an
example of fixed
pulley
A water well is another
example of fixed pulley

13. A movable pulley is a pulley that is free
to move up and down, and is attached
to a ceiling or other object by two
lengths of the same rope.
F = L/2

14. An elevator is an
example of movable
pulley
A crane is an example of
movable pulley

15. A compound pulley is a
combination of a fixed and
movable pulley.
F = L / 2
n

16. You use de compound
pulley in the saliboats
You use de
compound pulley to
elevate the bike

20. A pulley is a wheel on an axle that is designed
to support movement and change of direction
of a cable or belt, or transfer of power
between the shaft and cable or belt. ...

21. A pulley attached to many pulleys

22. N= rpm
D= diameter
N1 x D1 = N2 x D2 N1/N2 = D2/D1

24. Gears
Mirian and Rebeca

25. MECHANISMS OUTPUTIMPUT
TRANSMISSING
MOTION
TRANSFORMING
MOTION

26. Transmitting
Linear
Rotary
pulleys
gears
gear
Worm gear
Gear with chain
Gear train

27. Mechanism of worm gear
A worm gear is a gear consisting of a shaft with a spiral thread
that engages with and drives a toothed wheel
• How it works?
An electric motor or engine applies rotational power via to the worm. The
worm rotates against the wheel, and the screw face pushes on the teeth of
the wheel. The wheel is pushed against the load.

28. Gear train
• Gear train is a combination of gears, is used for transmitting
motion and power from one shaft to another shaft. Gear
trains are used to achieve large and different velocity ratio in
small area or space.

29. Types of gear train
• Simple gear train
• Compound gear train
• Reverted gear train
• Epicyclical gear train

30. Gears with chains
• A gear through which motion is transmitted by a chain that runs in a groove or
engages the cogs of a sprocket wheel

31. N1 X Z1 = N2 X Z2
N= rotary velocity (rpm)
Z= nº of cogs
N1/N2=Z2/Z1
INVERSE RELATION
(size/velocity)

32. Leire Sánchez
Manuel Rodríguez
3º A Technology
L

33. A mechanism is a system of parts working
together in a machine.
-Other types of mechanism
-Rotary into linear
-Function
M

34.  We´re going to be talking about three mechanisms that transform rotary
movement into linear movement. These three mechanisms are:
-Rack and pinion
-Winch
-Nut and bolt
L

35.  Rack and pinion
THIS USES A SMALL COGWHEEL OR GEAR
MOUNTED ON A TOOTHED BELT OR BAR.
Ex.: locking door
M

36.  Winch
THIS CONSITS OF A CRANK HANDLE ATTACHED TO THE AXLE
OF A CYLINDRICAL DRUM.
Ex: lifting weights on industrial
processes.
L

37.  Nut and bolt
THIS CONSITS OF A BOLT OR THREADED BAR AND A NUT THAT HAS THE SAME
INTERIOR DIAMETER AS THE DIAMETER OF THE BOLT.
Ex.: holding railways
M

38. ROTARY INTO
RECIPROCATING
Paula Prieto Delgado
Aidé Álvarez Fernández

39. WHAT WE ARE GOING TO EXPLAIN

40. CRANK-LINK-SLIDER
EXAMPLE:
In a crank-link-slider the slider moves from
one side to another and the connecting road
that is joined to the crank off center makes it
rotate

41. CRANKSHAFT
EXAMPLE:
Is a serie of holes connected to
slides, so when the mechanism
rotates, it makes the slides move
forwards and backwards

42. CAM
EXAMPLE:
Is an egg-shaped disc with an slide and a follower.
The disc makes the slide go up when it’s largest
part touches it.

43. ECCENTRIC
The disc with centre of rotation positioned off centre rotates
and the flat follower rises and falls constantly.
EXAMPLE: