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Sheet Metal 3rd Year > Pattern Development > Flashcards

Pattern Development Flashcards

1
Q

What are the most common triangulated fittings?

A

Top Takeoff, End Boot and Garbage Chute

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2
Q

When is a face line used ?

A

When triangulating a transitional Y-Branch

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3
Q

What is a foreshortened line?

A

A line that appears shorter than it actually is.

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4
Q

When determining the VH (vertical height) for a pattern all seams and allowances must be _________.

A

Subtracted.

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5
Q

How much of the pattern of an on centre both ways square to round needs to be developed ?

A

1/4 pattern

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6
Q

What view is necessary to develop a square or rectangular to round fitting ?

A

Plan view.

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7
Q

Transitional elbows are most commonly found in __________ installations.

A

Commercial

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8
Q

What are the benefits of transitional elbows ?

A

direction, dimension and elevation can be changed with one fitting

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9
Q

In transitional ogee offsets the vertical height of the sloped pattern is obtained from the sloped length of the ________

A

Runners

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10
Q

Why are transitions necessary ?

A

Transitions are necessary to change the size and or position of the main trunk to maintain the required amount of airflow

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11
Q

Twists serve the same purpose as ________

A

Transitions.

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12
Q

The vertical height of transitions and twists is the height of he fitting minus any ________ and ________.

A

Collars and Allowances

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13
Q

Cheek patterns for transitional y-branches are developed from the _________ view.

A

Elevation view

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14
Q

Multiple branch fittings are typically used in _______ systems

A

Blowpipe systems

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15
Q

How are 3 way branches triangulated ?

A

Chord offsets

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16
Q

What is the simplest form of triangulation?

A

Triangulation from plan view

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17
Q

The round collar pattern must be developed ______in order to determine the distance from point to point as you work your way around the round opening

A

First

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18
Q

Rectangle to round on patch fittings are found on what type of roofs ?

A

Pitch roofs only

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19
Q

What is an advantage of rectangle to round offsets ?

A

Combine 2 fittings into 1

20
Q

Triangulation from elevation uses what views ?

A

Elevation and Plan View

21
Q

When the fitting is on Centre the work line is always located ______ the depth of the rectangular opening as seen in the plan view.

A

1/2

22
Q

Where are garbage chutes found ?

A

Older apartment buildings or small apartment blocks

23
Q

Where is rectangle to round used in residential?

A

End boots

24
Q

If the work line falls within the plan view you continue the ______ development

A

Pattern

25
Q

What is a chord offset ?

A

A chord offset can be described as a distance between a point on the collar opening and a point on the plan view perpendicular to the collars opening

26
Q

Developing a pattern for a round reducing elbow uses __________ and _______ _____ development

A

Triangulation and parallel line development

27
Q

On a round reducing elbow when subtracting once chord offset from another you must always work from the __________ in

A

Outside

28
Q

When do the collars need to be developed on a round reducing offset ?

A

The collars need to be developed first

29
Q

On round reducing offsets the collars must be developed ______

A

First

30
Q

Round reducing y branches are typically found in _____ _______ systems

A

Dust collection

31
Q

How much of the pattern must be developed for an on Centre round reducing y branch ?

A

1/2 pattern

32
Q

How is the crotch mitre plan view developed ?

A

From the major and minor axis

33
Q

How is the ellipse developed in a round reducing y branch ?

A

With a minor and major axis

34
Q

Where are boots most commonly found ?

A

Residential duct systems

35
Q

Where are right angle boots commonly found ?

A

Above and below windows

36
Q

How many work lines are required for on Centre boots ?

A

One work line

37
Q

How many work lines are required for off Centre boots ?

A

Two work lines

38
Q

What is an advantage of top take offs ?

A

Top take offs allow branch lines and run within joists

39
Q

What view is used to triangulate end or right angle boots ?

A

Elevation view

40
Q

It is acceptable to use boot configurations when developing a _________

A

Wall stack

41
Q

The work line of a boot is found by measuring the centre of the ______ opening to the outside of the _____ opening

A

Round . Rectangular

42
Q

What types of pattern development are used on bull head tees ?

A

Line to line and triangulation

43
Q

What type of installations are bull head tees used in?

A

Blow pipe installations

44
Q

How many side of the triangle need to be triangulated in bull head tees ?

A

2 sides

45
Q

One foot of water equals ____ PSI

A

0.433 PSI

Sheet Metal 3rd Year (4 decks)

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