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Parallel Line Development > Final > Flashcards

Final Flashcards

1
Q

What is parallel line development

A

Process of developing patterns for objects with a constant cross section

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2
Q

How many views do you need to perform parallel line development

A

2

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3
Q

What does an elevation view represent

A

Represents what the object would look like if you were looking at it from the side

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4
Q

What does the plan view represent

A

Represents what the object would look like if you were looking at it from above or below

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5
Q

What are element lines

A

Foundation of parallel line development, drawn on the surface of the object in the elevation view at their true length

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6
Q

What are projection lines

A

Projection lines are used to project an element point from one view to another, or from a view to a pattern

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7
Q

What weight are projection lines drawn in

A

Construction

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8
Q

What is a Half plan view

A

A shortcut when developing patterns

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9
Q

What is the miter

A

Line when two gores meet

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10
Q

Define stretch out

A

Length of pattern

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11
Q

Define true length lines

A

True length of the element lines

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12
Q

Define step off distance

A

A distance on the stretch out line representing the distance between element pints

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13
Q

Define primes

A

Names used to identify extra element points related to another point

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14
Q

Define net pattern

A

Pattern without any allowances

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15
Q

Define gross pattern

A

Net pattern with allowances

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16
Q

What is the formula for stretch out

A

3.14 x diameter

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17
Q

On a square pattern what are brake lines also known as

A

Element lines

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18
Q

When labeling element points where do you start and which way do you go around

A

At the seam and clockwise

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19
Q

When are round elbows used

A

When round pipes must change direction either horizontally or vertically

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20
Q

When are round offsets used

A

When round pipe has to bypass a permanent obstruction either horizontally or vertically

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21
Q

How many pieces is a residential adjustable 90 made out of and what gauges

A

4 pieces
28g or 30g

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22
Q

How many pieces are commercial adjustable elbows made out of and what gauge

A

5 or 7 pieces
26-22g

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23
Q

What gauge are lap and spot welded elbows made of

A

26-18

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24
Q

Round elbows with larger diameters need to be developed and assembled in ———— or ——— to achieve the desired angle

A

Sections or pieces

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25
Q

What’s the minimum gauge for a butt welded elbow, what are the benefits, and what’s another name for them

A

18 gauge
Provide a smooth surface, and airtight seams
Breaching elbows when venting boilers

26
Q

Which elbows are primarily used in high velocity systems

A

22ga Beta elbows

27
Q

Which elbows are used in material handeling

A

Lap and spot
Butt welded
Formed elbows

28
Q

List three different styles of round offsets

A

3 piece and 5 piece

29
Q

What should minimum length an offset should be

A

Twice the amount of the offset

30
Q

What is the formula for miter angle

A

Degree of elbow
2x number of pieces -2

31
Q

What is the most accurate method to establish the miter line on a round elbow, and what is another method

A

Bisect an angle
Protractor

32
Q

How many parts is the planview and stretch out divided into

A

12 equal spaces

33
Q

What are the four methods used to establish the miter line for a round offset

A

Given throat length
Given centreline length
Given heel length
Bisecting centreline

34
Q

True or false
All element lines must be parallel to the sides of the offset

A

True

35
Q

An adjustable elbow can be twisted to form any angle from what degrees

A

0-90

36
Q

The development of a round offset is similar to what fitting

A

3 piece elbow

37
Q

When the throat height is given when creating the mitre line for a round offset the arc will be drawn from where

A

The throat

38
Q

What is the allowance for an elbow seem

A

1/8th

39
Q

What is the small end allowance

A

7x the material thickness

40
Q

What is the allowance for a grooved seam

A

3X the grooved seam

41
Q

Where are tees used

A

Most used on venting and air distribution systems

42
Q

How would you describe a tee with a 6” main branch size and a 4” stub

A

4 on 6 tee

43
Q

True or false
The process for devolping on center tees is the same for off center tees

A

True

44
Q

When laying out a tee fitting you start by drawing what view

A

Side elevation

45
Q

Corresponding element lines from the end view and side elevation create

A

The mitre line

46
Q

If the stub has the same diameter as the pipe, the stepped off distances for the hole patter will be ————

A

Equal

47
Q

When laying out a hole pattern, element lines must be extended from what view

A

Elevation

48
Q

When laying out just the stub pattern, the end view and plan viewis all that is required
T or F

A

True

49
Q

What is the formula for a rectangular stub

A

2L+2W

50
Q

When laying out a y stub pattern it is necessary to have which views

A

Both side and end views

51
Q

There will be a hidden line in the side elevation view of an on center pipe y
T or F

A

True

52
Q

Y pipes are always laid out at 45
T or F

A

True

53
Q

Hole pattern spacing around the main cylinder is taken from what view

A

End view

54
Q

Extended element lines from what view develop the hole pattern

A

Side elevation

55
Q

What lines are the foundation of parallel line development

A

Element lines

56
Q

To properly develop a parallel line development pattern you just have the true length of the ————

A

Element line

57
Q

Primes in parallel line development are used to indentify an—————

A

Extra element point

58
Q

You can develop patterns for spherical objects with parallel line development
T or F

A

True

59
Q

What is found in the plan view

A

Perimeter of the pattern

60
Q

Element line spacing on the stretch out is best developed by which method

A

Calculating and measuring

Parallel Line Development (2 decks)

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