Mechanical Devices Flashcards
1
Q
Mechanism
A
A mechanism is a device that changes an input motion into a different output motion
2
Q
Examples of mechanisms
A
- levers
- linkages
- cams
- gear trains
- pulleys and belts
3
Q
Types of motion
A
- linear (straight line)
- rotary (round)
- oscillating (movement swinging from side to side)
- reciprocating (movement backwards and forewords in a straight line)
4
Q
3 main points of a lever
A
- effort (input)
- load (output)
- pivot/fulcrum
5
Q
Lever
A
A rigid bar that turns around a fulcrum
6
Q
Three classes of lever
A
First class Second class Third class
7
Q
First class
A
When the fulcrum is at the middle eg. crowbars
8
Q
Second class
A
When the load is in the middle eg. wheel burrow
9
Q
Third class
A
When the effort is in the middle eg. cranes, fishing
10
Q
Arm length
A
The distance between the fulcrum and the effort/load
11
Q
Linkages
A
A collection of levers
12
Q
What can cams and followers do
A
A cam and a follower convert rotary motion into reciprocating motion
13
Q
Pear
A
Pear shaped
14
Q
Eccentric
A
Shaft is not in middle
15
Q
Snail
A
Looks like a snail’s shell
