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M7 > 7.5 Engineering Drawings > Flashcards

7.5 Engineering Drawings Flashcards

1
Q

How should you smoothe out food lines on drawings?

A

Smooth them DO NOT bend them backwards

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2
Q

What are the three most common standards used for drawings?

A

International organisation for standardisation (ISO)
American National Standards Institute (ANSI)
British standard (BS8888)

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3
Q

What are the three types of working drawings?

A
  • detail drawings
  • assembly drawings
  • installation drawings
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4
Q

When is a detail drawing made?

A
  • during aircraft design
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5
Q

What is included in a detail drawing?

A
  • size and shape description
  • material and heat treatment requirements
  • protective finish instruction
  • Machine finish if required
  • part numbering and marking instructions
    (Bscly everything required for fabrication)
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6
Q

What does an assembly drawing include? Where is this?

A
  • reference individual parts’ by their part number
  • specify type and number of fasteners needed to join them together
  • found in the lower right hand
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7
Q

What dimensions are included in an assembly drawing?

A

Only those needed to assemble the parts included

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8
Q

What is an assembly?

A
  • multi piece item that can be disassembled in to its components or units without being destroyed
  • cannot perform a complete function independently
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9
Q

What’s the main purpose of an installation drawing?

A
  • To show exactly where certain parts or assemblies are to be permanently fixed, pertaining to the aircraft
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10
Q

What does the bill of material on an installation drawing show?

A

Any instructions required for the installation
Any fasteners needed
Dimensions only given for those adjustments needed for the part to function

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11
Q

What is the difference between assembly and installation drawings in terms of locating?

A

Assembly drawings give parts locations in relation with each other.
Installation drawings give their position relative to the aircraft.

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12
Q

What word is in the title of all installation drawings?

A

“Installation”

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13
Q

When is a sectional drawing used?

A

To show a parts internal construction or shape

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14
Q

What are the four types of sectional drawings?

A

Revolved
Removed
Complete
Half section

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15
Q

Revolved section drawings: where is the cutting plane?

A

Cutting plane is perpendicular through the feature/ object

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16
Q

Revolved section drawings: how is the material cut with the cutting plane projected?

A

Rotated 90 degrees
Projected to the adjacent view on the adjacent view

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17
Q

When is a revolved drawing used and what does it show?

A
  • used when only the shape of a part needs to be shown
    • shows how a part is sectioned and revolved to illustrate it from a different view
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18
Q

What is a removed section drawing used for?

A
  • to illustrate simple objects from another angle
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19
Q

If a drawing becomes too cluttered, where can removed drawing be displayed?

A

Section can be drawn adjacent to the view

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20
Q

What are complete sectional drawings used for?

A

To illustrate complex assemblies such as cable connectors

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21
Q

What does a half sectional drawing show?

A

Upper half of the drawing: assembly’s internal construction
Lower half: shows the entire assembly from the outside

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22
Q

Identify the drawing: All parts are in their relative positions but are exes dead outwards, so that each can be identified by their physical appearance or name

A

Exploded view drawings

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23
Q

What does a block diagram consist of?

A

Individual blocks that represent several components
Shows how they are all connected

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24
Q

What are block diagrams used for?

A

To aid troubleshooting of complex electrical and electronic systems

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25
Q

What do logic flowcharts show?

A
  • shows specific logic gates and their relationship to other digital devices in a system using standardised symbols
  • shows the inputs and outputs of individual components
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26
Q

What were logic flowcharts specifically developed for?

A

For analysing digitally controlled components and systems

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27
Q

What do schematic drawings show?

A
  • the principle of the operation
  • where objects are located only in relation to each other
  • direction of fluid flow (if applicable)
28
Q

Can the exact image of an object be seen in a schematic drawing?

A

No

29
Q

What do electronic schematic diagrams show?

A
  • show symbols for each component found in the circuit
  • show function and flow
30
Q

Do electronic schematic diagrams show the placement or scale of components?

A

No

31
Q

What dimensional are pictorial diagrams?

A

Two dimensional drawings

32
Q

What are schematic drawings mostly used for by engineers?

A

Fault diagnosis
See how components in complex systems interact

33
Q

What do the types of projection refer to?

A
  • orientation
  • how it’s viewed on a flat plame
34
Q

How is an orthographic projection drawing presented?

A
  • Represents 3D object using several two dimensional views of the object
35
Q

In an Orthographic projection, how many possible views are there from which an object can be drawn?

A

Six views:

Front
Rear
Top
Bottom
Left side
Right side

36
Q

How does the first angle represent an object?

A

“Represent the side of the object that is remote from it in adjacent view”
The drawing is next to the part of the object it represents

37
Q

How does the third angle present an object?

A

“Each view represents the side of the object that is nearest to it in the adjacent view”
The drawing is illustrated on the side opposite of the object

38
Q

Which angle is European in origin?

A

The first angle

39
Q

What is the first angle projection symbol?

A

Rectangle : target

40
Q

What’s an isometric drawing?

A

Tilts an object forward so all three views can be seen in one view

41
Q

Where are all the edges of the object on an isometric drawing?

A

The edges of the object all form a 30 degree angle to the drawing plane

42
Q

What is an oblique drawing?

A
  • An isometric drawing with one object face parallel to the drawing plane
  • front if the object identical to the front view of an orthographic drawing
43
Q

What is the depth axis of an oblique drawing?

A
  • anything convenient
  • most often 45*
44
Q

What are perspective drawings?

A
  • shows an object as it would appear to the observer
45
Q

Are the actual angles and dimensions in a perspective drawing accurate? Why?

A
  • not accurate
  • lines aren’t parallel as it imitates how you’d see the object irl
46
Q

In a drawing, if no inch mark is used what is the dimension given in?

A

Inches

47
Q

What do centre lines look like?

A

Made up of alternate long and short dashes

— - — - — - —

48
Q

What are dimension lines?

A
  • an arrow with a vertical line on each side
49
Q

How are the dimensions of circular parts given?

A
  • In terms of the circles diameter
  • Marked with the letter D or DIA
50
Q

How are dimensions of an arc displayed?

A
  • given in terms of radius
  • marked w an R following the dimension
51
Q

What do section lines show?

A

Indicate the exposed surfaces of an object in a sectional view

52
Q

What do phantom lines indicate?

A

Alternate positions or layers or the object, or the relative position of a missing part

53
Q

What do phantom lines look like? Is

A

One long and two short evenly spaced dashes
— - — -

54
Q

What do break lines indicate? What do they look like?

A
  • indicate a portion if the object is not shown
  • short breaks are made by solid, freehand lines. Long breaks shown by solid rules lines w zigzags
55
Q

What do leader lines indicate and how do they look?

A
  • indicate a part or option that a note, number or other reference applies
  • solid lines with one arrowhead
56
Q

What are Biden lines also referred to as?

A

Dash lines
- - - -

57
Q

What do cutting plane lines indicate?

A

Indicate the plane where a sectional view of the object is taken

58
Q

What do viewing plane lines indicate?

A

Indicate the plane from where a surface is viewed

59
Q

What’s the difference in the symbol of a solid metal rod and a hollow tube?

A

Solid metal is shaded

60
Q

What are finish marks used for?

A

To indicate the surface has to be machine finished

61
Q

Surface texture: is the number bigger or smaller if the surface finish is to be smoother?

A

Smaller
Smaller the number above the triangle- smoother the finish.

62
Q

What does a circle above a triangle for surface finish mean?

A

No surface finish

63
Q

When there’s a single number on the surface finish symbol, what does it mean?

A

That is the maximum degree of roughness acceptable

64
Q

What a thick lined circle portrait?

A

Drilled holes

65
Q

What do threaded holes have to show the thread crest and root?

A

Thread crest: thick circular line
Root: thin circular line

66
Q

When the delay for a counterbored, countersunk or spotfaced hole aren’t given, what is the depth required?

A

The minimum depth required to achieve a flat seating

M7 (5 decks)

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