Full Millwright Manual Study Guide > Chapter 3: Technical Drawings > Flashcards

Chapter 3: Technical Drawings Flashcards

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1
Q

How does the ability to read and interpret drawings benefit a millwright?

A

It helps aid the millwright in fabrication, troubleshooting, and interpreting machinery

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2
Q

In an orthographic drawing what direction is the object viewed from in the front elevation

A

Front

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3
Q

In an orthographic drawing what direction is the object viewed from in the plan view

A

Top or bottom

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4
Q

What are the 3 categories of technical drawings?

A

Orthographic
Pictorial
Schematic

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5
Q

What are the two types of orthographic drawings

A

First angle
Third angle

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6
Q

What are the 3 categories of pictorial drawings?

A

Isometric
Oblique
Perspective

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7
Q

What is an easy way to tell the difference between orthographic drawings and pictorial?

A

Orthographic is 2D
Pictorial is 3D

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8
Q

Where does first angle projection originate?

A

Europe

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9
Q

Where does third angle projection originate?

A

North America

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10
Q

Does the image show first or third angle projection?

A

First angle

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11
Q

Does the image show first or third angle projection?

A

Third angle

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12
Q

Does the photo show first or third angle projection?

A

First angle

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13
Q

What view projection is shown in the picture?

A

Third angle

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14
Q

How is first angle projection described?

A

The object is viewed from left to right

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15
Q

How is third angle projection described?

A

The view is from right to left

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16
Q

Name the views that are usually required in a third angle orthographic projection drawing (3)

A

Top (plan)
Front (front elevation)
One side (side elevation)

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17
Q

Which view is chosen to be in the front view for a technical drawing?

A

What ever side of the object shows the most information about its shape

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18
Q

Describe how isometric drawings are drawn

A

All lines are drawn either vertically or at 30 degrees to the horizontal. The lengths along the 30 degree axes are drawn to full scale

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19
Q

What type of pictorial drawn is shown

A

Isometric

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20
Q

Describe how oblique drawings are drawn

A

One face is at a right angle to the horizontal and the others are at an angle (usually 45 degrees) to the horizontal

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21
Q

What type of pictorial drawing is shown?

A

Oblique

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22
Q

What are the two main characteristics of an isometric drawings?

A

Tipped (30 degrees)
2 direction

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23
Q

What are the two main characteristics of an oblique pictorial drawing?

A

Flats bottom
1 direction

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24
Q

How is line thickness defined by Canadian Standards?

A

Thick
Thin

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25
How much thicker are thick lines compared to thin ones by Canadian standards?
At least twice as thick
26
Describe what a visible outline looks like
Thick, dark, bordering
27
What type of line is the first top one?
Visible outline
28
Describe a construction and projection line
Thin lines Used to layout the various views of an object Construction lines are eventually overlaid by the object lines
29
Describe object lines
Thick lines which indicate the visible outline of an object
30
Describe hidden lines
Thin Spaced Broken lines
31
Describe break lines
Can be thick or thin typically wavy or gagged
32
Define hidden lines
Show those surface and features of the object that are not seen in the chosen views
33
Define break lines
Used to shorten the view of an object from a long uniform section
34
Describe section lines
Parallel diagonal lines (hatch marks)
35
Define section lines
They identify a sectional view of an object in a drawing
36
Describe centre lines
Thin broken lines with long and short lines spaced alternately
37
Define centrelines
Show centreline of a shaft and of holes in an object
38
What type of lines are shown in the photo
Cutting plane lines
39
What are the two methods of marking dimensions
Aligned Unidirectional
40
How is the aligned dimension markings easily described
All dimension figures are aligned with the lines
41
How is the unidirectional dimensioning method described?
All numbers are written parallel to the bottom of the paper
42
What are the two types of dimensions?
Overall dimensions Detail dimensions
43
How are overall dimensions defined
Indicate overall length, width, or height of an object
44
How are detail dimensions defined
Give size and location of an feature or detail not in the overall length width or height
45
In drawings can you use both aligned and unidirectional?
No all dimensions must be written or one style or the other not both
46
In metric drawing how are dimensions units shown:
Without their units in mm Ex: 1100 is shown on the drawing which mean 1100mm
47
What does side view in full section mean?
Cutting section Side view Full section (half ) cut once
48
What’s does side view in half section mean?
Cutting section Side view Half section (quarter) cut twice
49
How is cast iron shown with pattern lines?
Full diagonal lines Equally spaced apart
50
How is steel shown using pattern lines?
Full Diagonal lines Alternating close together to further apart.
51
How is brass, bronze, copper shown using pattern lines?
Diagonal lines All equally spaced Alternating between dotted and solid
52
What material is this showing?
Cast iron
53
What material is this showing
Steel
54
What material is this showing
Brass, copper, or bronze
55
Describe auxiliary views
Auxiliary views - created by projecting lines of the object where the sloping surface appears as an edge
56
Describe exploded views
Exploded views- take complex drawings and separate it along a common axis this shows exactly how a group of parts fit together
57
What type of view is this
Exploded view
58
Define tolerance
Tolerance - the total permissible variance of the basic size of a component Tolerance sizes are the maximum and minimum sizes that are allowable
59
Describe unilateral tolerance
Unilateral tolerance- is tolerance in only one direction
60
Describe bilateral tolerance
Bilateral tolerenece - is tolerance in two directions
61
Describe maximum material condition (MMC)
Maximum material condition (MMC) -
62
What is the purpose of sectional view?
Used to show an aspect of the object that are too complex to show from standard angle views
63
Describe the difference between a full section view and a half section view
Full section - cut in half (cut once) Half section - quarter section (cut twice)
64
Describe Direct Method
Shows both upper and lower limits together. Removing calculations.
65
What is a datum or reference point?
Used when several measurements on the same plane are being given to act as the starting points for all
66
Describe a clearance (positive) fit
Easily fitted allows for a small amount of clearance between objects
67
Describe an interference (negative) fit
Close fit which requires heating, cooling or a combination of both to assemble the pieces
68
What are the two main reasons for the need of surface texturing?
Friction reduction Control to wear
69
What is a micro meter in terms of a meter??
0.000 001 meters
70
What is micro inch in terms of an inch
0.000 001 inches
71
Where should a title block always appear on a drawing?
Lower right hand side
72
What does a drawing scale of 1:1 mean
True to size
73
What type of drawing scale is 1:10
Revision it means 1 unit on the print is equal to 10 of the same units to the equipment
74
What type of drawing scale is a 10:1
Enlarged scale. It means 10 units of the scale is equal to 1 of the actual object
75
Describe a detail drawing
Detail drawing: a technical representation of one single part of a machine
76
What is an assembly drawing?
Assembly drawing : shows the various pieces of a machine and the way they fit together as a complete unit
77
What is the main benefit of an assembly drawing?
Gives a general idea of how the machine works
78
Describe a schematic drawing
Schematic drawing - facilitates the tracing of a hydraulic, pneumatic, or electrical lines and components for each
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