gears cams followers

studied byStudied by 1 person
0.0(0)
get a hint
hint

Simple Machines

1 / 151

Tags and Description

Engineering

152 Terms

1

Simple Machines

  • make effort easier

New cards
2
  • changes direction or magnitude of force applied for work

New cards
3

Compound Machines

multiple simple machines working together

New cards
4

6 Simple Machines

  • Inclined Plane

New cards
5
  • Wedge

New cards
6
  • Lever

New cards
7
  • Pulley

New cards
8
  • Screw

New cards
9
  • Wheel and Axle

New cards
10

Inclined Plane

Stationary, flat surface set at angle

New cards
11
  • as distance of slope increases, force decreases, greater mechanical advantage

New cards
12

New cards
13

Ex:

New cards
14
  • ramp

New cards
15
  • ladder

New cards
16
  • staircase

New cards
17

New cards
18

New cards
19

SLOPE IS MECH ADVANTAGE

New cards
20

Wedge

Moving inclined plane that moves through a load

New cards
21
  • thinner the wedge, bigger the mechanical advantage

New cards
22

New cards
23

New cards
24

SLOPE IS MECH ADVANTAGE

New cards
25

1st Class Lever

fulcrum between effort and load

New cards
26
  • fulcrum midpoint: no advantage

New cards
27
  • fulcrum close to effort: distance amplified

New cards
28
  • fulcrum close to load: effort amplified

New cards
29

2nd Class Lever

load between fulcrum and effort

New cards
30
  • load closer to fulcrum, increased mech advantage

New cards
31
  • effort force is amplified

New cards
32

Ex:

New cards
33

Wheelbarrow

New cards
34

3rd Class Lever

effort between load and fulcrum

New cards
35
  • moves load over longer distances and reduces effort

New cards
36

Ex:

New cards
37

Baseball bat

New cards
38

fishing rod

New cards
39

Wheel and Axle

a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects

New cards
40
  • large force applied to axle, greater distance of wheel

New cards
41
  • small force applied to wheel, large torque on wheel

New cards
42

New cards
43

RADIUS OF WHEEL OR AXLE IS MECH ADVANTAGE

New cards
44

Pulley

A simple machine that consists of a rope that fits into a groove in a FREE SPINNING wheel

New cards
45
  • Fixed pulley: changes direction of force but no mech advantage

New cards
46
  • Single movable pulley: effort is halved, distance increase by factor of two

New cards
47
  • Block and Tackle: multiple pulleys, effort is reduced but amount of rope is increased

New cards
48

New cards
49

New cards
50

# OF PULLEYS AND ROPE LENGTH IS MECH ADVANTAGE

New cards
51

Screw

a simple machine that consists of an inclined plane wrapped around a cylinder

New cards
52
  • converts rotary motion to linear motion

New cards
53
  • large output forces

New cards
54

New cards
55

Pitch: linear distance traveled in one revolution, small pitch is greater force

New cards
56

Types of Mechanical Motion:

  • Linear: straight line (box up a ramp)

New cards
57
  • Reciprocating: back and forth (saw)

New cards
58
  • Rotary: continuous circular (fan)

New cards
59
  • Oscillating: back and forth along an arc on a pivot (pendulum)

New cards
60
  • Intermittent: starts and stops predictably (clock)

New cards
61
  • Irregular: no pattern (robot)

New cards
62

Mechanism

A system of mechanical parts connected to a drive source

New cards
63
  • Transfer between types of motion

New cards
64
  • to classify as mechanism, must have a predictable output motion based on known input motion

New cards
65

Gear

A circular toothed object used to transfer rotary motion and torque from one shaft to another

New cards
66

Torque

rotational force

New cards
67

Gear Train

  • 2 or more gears in mesh

New cards
68
  • only one gear per shaft

New cards
69
  • small gear to big: more force

New cards
70
  • big gear to small: more speed

New cards
71
  • changes or maintains rotational direction

New cards
72

In order to Mesh...

Pressure Angle: Angle of the gear tooth itself

New cards
73

Gear Pitch: Number of gear teeth per arc length

New cards
74

Pitch Circle: Where the gear teeth meet the circumference of the wheel;

New cards
75

all must be equal to the second gear in mesh

New cards
76

Pinion

smaller of two gears

New cards
77

Compound gear train

two gears of different sizes are locked to the same idler gear shaft. Have a greater ability to increase/decrease rotational speed and torque.

New cards
78

Drive gear

the input gear

New cards
79

Driven gear

the output gear

New cards
80

Idler

bridges the gap between input and output gear, may be used to change rotational direction

New cards
81

Gear ratio

# teeth in driving gear (front)/# teeth in driven gear (rear)

New cards
82

Spur gear

  • straight cut teeth, uses parallel shafts

New cards
83

Pros: low cost, easy to build, high precision

New cards
84

Cons: limited distance, not good at high speeds or stress

New cards
85

Helical Gear

  • angled teeth, smoother, greater load capacity

New cards
86

Pros: less slipping, smoother, greater load

New cards
87

Cons: costly, runs hotter

New cards
88

Bevel Gear

  • used for perpendicular shafts, tapered teeth, designed in pairs

New cards
89

Pros: high speed without speed loss

New cards
90

Cons: difficult to design

New cards
91

Rack and Pinion

  • linear gear (Rack) moving circular spur gear (pinion), converts between rotary and linear motion

New cards
92

Pros: easiest and cheapest way to slow speed

New cards
93

Cons: noisy with friction

New cards
94

Worm gear

  • screw and wheel perpendicular to each other

New cards
95
  • causes speed reduction and increase in torque

New cards
96

Pro: high reduction ratio, self-locking

New cards
97

Cons: high heat and inefficient

New cards
98

Cam

rotating machine component that has an irregularly curved outline; transmits a specific or continuous motion to the follower

New cards
99

Follower

paired with a cam, follows the outline of the cam; transmits reciprocating or oscillating motion to other machine parts.

New cards
100

Cam Types

  • Plate or Disc: follower follows circumference of cam

New cards

Explore top notes

note Note
studied byStudied by 827 people
Updated ... ago
4.8 Stars(5)
note Note
studied byStudied by 17 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 11 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 4 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 17 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 4 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 30 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 36362 people
Updated ... ago
4.9 Stars(205)

Explore top flashcards

flashcards Flashcard60 terms
studied byStudied by 2 people
Updated ... ago
5.0 Stars(2)
flashcards Flashcard264 terms
studied byStudied by 62 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard59 terms
studied byStudied by 9 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard31 terms
studied byStudied by 20 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard57 terms
studied byStudied by 11 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard55 terms
studied byStudied by 32 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard46 terms
studied byStudied by 18 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard32 terms
studied byStudied by 3116 people
Updated ... ago
4.3 Stars(35)