Motion Flashcards

1
Q

What type of motion goes in one direction only?

A

Linear motion

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2
Q

What type of motion goes back and forth?

A

Reciprocating motion

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3
Q

What type of motion goes in circles?

A

Rotary motion

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4
Q

What type of motion swings back and forth?

A

Oscillating motion

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5
Q

What does a mechanism have?

A
  • an input, process and output
  • the ability to change direction in which a force acts
  • the ability to change the size of the force
  • the ability to change the place where the force acts
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6
Q

An input of a mechanism is….

A

The change of condition that will influence the output

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7
Q

The process of a mechanism is….

A

The transfer of information provided by the input to the output

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8
Q

The output of a mechanism is….

A

A predictable end result produced by the input

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9
Q

What is a class one mechanism?

A

Load Effort
_______________________
Fulcrum

Example : the workman uses the trolley to carry the load

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10
Q

What is a class two mechanism?

A

. Effort
________________________________
Fulcrum Load

Example : the gardener uses the wheelbarrow to carry the load

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11
Q

What is a class three mechanism?

A

. Effort
__________________________________
Load Fulcrum

Example : the fisherman catches the load

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12
Q

What does one cycle mean?

A

One rotation/revolution of the CAM

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13
Q

What does dwell mean?

A

When the CAM rotates but the follower doesn’t rise or fall

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14
Q

What does rise mean?

A

The part of the CAM that causes the follower to rise

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15
Q

What does fall mean?

A

The part of the CAM that causes the follower to fall

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16
Q

What are the different types of cam profiles and what do they mean?

A

Pear - follower is motionless then rise and falls
Eccentric - produces smooth motion
Snail - follower rises then suddenly drops
Heart - allows rise and fall

17
Q

What are the types of belts and their advantages?

A

Round belts - can turn through 90 degrees
Toothed belts - low chance of slippage
V belts - greater drive because more surface area touches the pulley

18
Q

What are the different types of gears and their descriptions?

A

Spur gears - transmit rotary motion on parallel shafts
Bevel gears - transmit motion through right angle
Worm and wheel - used to reduce speed, worm is always the driver
Rack and pinion - changes rotary to linear motion
Sprockets and chains - transmits motion through 2 gears, not touching but using a chain

19
Q

What is the equation for calculating the gear ratio?

A

Number of teeth on the driver
——————————————
Number of teeth on the driven

20
Q

What is an idler gear used for?

A

To make the driver and driven gears turn in the same direction