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Second Year Welding > Pattern Development > Flashcards

Pattern Development Flashcards

1
Q

NTS means

A

Not to scale

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2
Q

From your perspective
Has a vanishing point
Artistic and realistic

A

Perspective drawing

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3
Q

Shows front, top and right sides
Front surface is true size and shape of object
Uses foreshortening

A

Oblique drawings

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4
Q

Equal measure
Always at 30 degree angles

A

Isometric drawings

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5
Q

Used two of more views
Look directly at one side of the object

A

Orthographic projection

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6
Q

Arrowheads

A

3-4 mm long

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7
Q

Used to add notes or information

A

Leader lines

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8
Q

Less cluttered
Easy to read
Not all dimensions necessary
—-
Disadvantage
Cumulative error
Mistakes in math

A

Conventional dimensioning

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9
Q

Risk of cumulative error eliminated
Need for math eliminated
——-
Disadvantage
Takes up lots of space

A

Baseline dimensioning

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10
Q

Combines advantages of both baseline and conventional systems
Eliminates need for math

A

Running dimension

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11
Q

8 degrees 20’ 30”

A

8 degrees, 20 minutes, 30 seconds

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12
Q

Used to draw horizontal lines

A

T square

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13
Q

Draws small circles and arcs
Used in one direction only

A

Compass / divider

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14
Q

Parts of a circle

A

Chord
Diameter
Radius
Sector
Arc
Segment
Semi circle
Tangent line
Sector

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15
Q

Common center (circle)

A

Concentric

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16
Q

Different centres (circle)

A

Eccentric

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17
Q

Divide into two equal parts

A

Bisect

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18
Q

Drawing using only a ruler and compass

A

Angular construction

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19
Q

How many steps around the circumference with the radius does it take to complete a full circle

A

6

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20
Q

Common tool that is useful at finding the centre of a circle

A

Carpenter square

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21
Q

The space/gap used for an extension line

A

2 mm

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22
Q

4 dimensioning methods

A

Conventional
Baseline
Running
Number placement

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23
Q

Set square

A

Triangles
90-60-30 set square
30 degrees - 60 degrees

45 degree set square
90-45 set

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24
Q

A straight line not through the center touching the circumference with both ends

A

Chord

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25
Any portion of the circumference
Arc
26
A portion of a circle bound by an arc and a chord
Segment
27
A portion of a circle bound by an arc and two radius lines
Sector
28
A line touching the circumference at one point only
Tangent line
29
Where the point bends Where the two lines meet
Vertex
30
Triangle: equal on all sides
Equilateral
31
Triangle: two equal sides
Isosceles
32
Triangle: no equal sides
Scalene
33
AIT T squares is a guide for drawing….
Horizontal lines
34
AIT Tolerances control the level of accuracy acceptable deviations in measurements +_ / + / - …..
Can be above or below Can be above only Can be below only
35
AIT What is this angle
60 degrees
36
AIT How many times do you move the carpenter square when finding the centre
One time
37
AIT How to make a blind flange (no hole in centre to stop connection)
1. Lay horizontal and vertical lines 2. Draw flange OD 3. Draw bolt circle diameter 4. Divide BCD into appropriate number of equal parts: depends on how many holes you need if you have eight bolt holes divide 360 by 8 5. Add bolt holes 6. Add a leader line to one bolt hole, giving bolt number and size
38
Two holing a flange
Straddle the center line of the flange
39
One hole
Is where it goes in center of hole typically is to attach a 45 degree to a normal pipe
40
Drawing. Real ————- = ———— Drawing. Real
Scale
41
Baseline dimensioning: Common baseline locations are
The tangent line The reference line The datum line The center line Work points on structural drawings A head Sean on vessels
42
Tangent line (Baseline dimensioning)
The moment the curve starts (where the circle meets straight line)
43
Running dimensions All tailed dimensions from this baseline
Disadvantage Must watch for dimensions that are not tailed
44
Number placement Unidirectional
Dimensioning from the bottom of the drawing
45
Number placement Aligned
Number placement read horizontally from bottom and aligned vertically from the right side
46
Can you measure from hidden lines
No
47
C= pie D
Circumference
48
How many degrees in a triangle
180
49
Acute angle
Less than 90 degrees
50
Obtuse angle
More than 90 degrees
51
Hexagon
6 sides
52
Octagon
8 sides
53
Pentagon
5 sided
54
Trapezoid
A four sided figure with two parallel sides and two non parallel sides
55
Parallelogram
Four sided figure, opposite sides of which are parallel and equal
56
What type of pictorial drawing shows objects as they appear to the eye
Perspective
57
Which type of drawing used one orthographic view with parallel lines receding off
Oblique
58
Oblique drawings are generally used for objects that
Are small and simple
59
Isometric drawings show horizontal lines receding at
30 degrees
60
Drawings using oblique projection are foreshortened to
Make the drawing look more realistic
61
One disadvantage of isometric drawing is that
All of the faces are distorted
62
One disadvantage of perspective drawing is that
These drawings cannot be drawn to scale
63
Two true statements regarding orthographic drawings
The views are always two dimensional The reader has to visualize the complete assembly
64
In order to have oblique drawings appear true to form the receding lines are drawn
Shorter than the actual length of the part
65
When dimensioning differs from conventional type it is called
Baseline dimensioning
66
The purpose of dimension are to
Indicate size and locations
67
Baseline dimensioning eliminates
Cumulative error
68
A hole dimension is expressed as a
Diameter
69
Wall thickness is measured in
Schedule Millimeters Standard Extra strong XXS
70
Little lines on tape measure are called
Graduations
71
Finding the arc on a rounded plate
Radius to focal point

Second Year Welding (13 decks)

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