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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
Q

Any portion of the circumference

A

Arc

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26
Q

A portion of a circle bound by an arc and a chord

A

Segment

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27
Q

A portion of a circle bound by an arc and two radius lines

A

Sector

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28
Q

A line touching the circumference at one point only

A

Tangent line

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29
Q

Where the point bends
Where the two lines meet

A

Vertex

30
Q

Triangle: equal on all sides

A

Equilateral

31
Q

Triangle: two equal sides

A

Isosceles

32
Q

Triangle: no equal sides

A

Scalene

33
Q

AIT
T squares is a guide for drawing….

A

Horizontal lines

34
Q

AIT
Tolerances control the level of accuracy acceptable deviations in measurements +_ / + / - …..

A

Can be above or below
Can be above only
Can be below only

35
Q

AIT
What is this angle

A

60 degrees

36
Q

AIT
How many times do you move the carpenter square when finding the centre

A

One time

37
Q

AIT
How to make a blind flange (no hole in centre to stop connection)

A
  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
Q

Two holing a flange

A

Straddle the center line of the flange

39
Q

One hole

A

Is where it goes in center of hole typically is to attach a 45 degree to a normal pipe

40
Q

Drawing. Real
————- = ————
Drawing. Real

A

Scale

41
Q

Baseline dimensioning:
Common baseline locations are

A

The tangent line
The reference line
The datum line
The center line
Work points on structural drawings
A head Sean on vessels

42
Q

Tangent line
(Baseline dimensioning)

A

The moment the curve starts (where the circle meets straight line)

43
Q

Running dimensions
All tailed dimensions from this baseline

A

Disadvantage
Must watch for dimensions that are not tailed

44
Q

Number placement
Unidirectional

A

Dimensioning from the bottom of the drawing

45
Q

Number placement
Aligned

A

Number placement read horizontally from bottom and aligned vertically from the right side

46
Q

Can you measure from hidden lines

A

No

47
Q

C= pie D

A

Circumference

48
Q

How many degrees in a triangle

A

180

49
Q

Acute angle

A

Less than 90 degrees

50
Q

Obtuse angle

A

More than 90 degrees

51
Q

Hexagon

A

6 sides

52
Q

Octagon

A

8 sides

53
Q

Pentagon

A

5 sided

54
Q

Trapezoid

A

A four sided figure with two parallel sides and two non parallel sides

55
Q

Parallelogram

A

Four sided figure, opposite sides of which are parallel and equal

56
Q

What type of pictorial drawing shows objects as they appear to the eye

A

Perspective

57
Q

Which type of drawing used one orthographic view with parallel lines receding off

A

Oblique

58
Q

Oblique drawings are generally used for objects that

A

Are small and simple

59
Q

Isometric drawings show horizontal lines receding at

A

30 degrees

60
Q

Drawings using oblique projection are foreshortened to

A

Make the drawing look more realistic

61
Q

One disadvantage of isometric drawing is that

A

All of the faces are distorted

62
Q

One disadvantage of perspective drawing is that

A

These drawings cannot be drawn to scale

63
Q

Two true statements regarding orthographic drawings

A

The views are always two dimensional
The reader has to visualize the complete assembly

64
Q

In order to have oblique drawings appear true to form the receding lines are drawn

A

Shorter than the actual length of the part

65
Q

When dimensioning differs from conventional type it is called

A

Baseline dimensioning

66
Q

The purpose of dimension are to

A

Indicate size and locations

67
Q

Baseline dimensioning eliminates

A

Cumulative error

68
Q

A hole dimension is expressed as a

A

Diameter

69
Q

Wall thickness is measured in

A

Schedule
Millimeters
Standard
Extra strong
XXS

70
Q

Little lines on tape measure are called

A

Graduations

71
Q

Finding the arc on a rounded plate

A

Radius to focal point

Second Year Welding (13 decks)

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