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2nd year sheet metal > Parallel Line Development > Flashcards

Parallel Line Development Flashcards

1
Q

A line used to divide an object into sections when developing patterns for round or irregular shapes, drawn on the elevation view at their true length-

A

Element line

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2
Q

A pattern with allowances added for fabrication-

A

Gross pattern

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3
Q

A line used to project an element point from one view to another-

A

Projection line

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4
Q

A point on the stretchout that represents the distance between element points from plan view-

A

Step off distance

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5
Q

A pattern with no allowances added-

A

Net pattern

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6
Q

Names used to identify extra element points related to another point-

A

Primes

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7
Q

The line where 2 parts of an object meet, usually at an angle-

A

Miter line

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8
Q

View of an object from the side-

A

Elevation view

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9
Q

When top and bottom halves of a view are identical, this can be used as a shortcut for round layout?

A

Half plan view

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10
Q

The actual length of a line usually found in elevation view?

A

True length line

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11
Q

View of an object from above or below-

A

Plan view

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12
Q

How many views are required to perform parallel line development?

A

2

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13
Q

A projection line is drawn in __________________ weight?

A

Construction

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14
Q

How many spaces are typically used when dividing a plan view into equal spaces?

A

12

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15
Q

What view is used to lay out a hole pattern?

A

Elevation view

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16
Q

Another name for the length of a pattern?

A

Stretchout

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17
Q

What method is used in parallel line development to divide the stretchout into 12 equal spaces?

A

Sloped rule

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18
Q

What type of fitting is the intersection of two pipes at an angle?

A

Pipe tee

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19
Q

What type of cylinder has the bases parallel to each other but the sides are not perpendicular to the bases?

A

Oblique cylinder

20
Q

Objects with a constant cross section can be developed with parallel line, true or false?

A

True

21
Q

When describing a pipe tee, you first state the ____________ size and then the main branch size?

A

Tee

22
Q

It is always best to start where when numbering the 12 equal divisions on a stub pattern?

A

At the seam

23
Q

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

A

Side elevation

24
Q

Corresponding element lines from the end view and side elevation create what?

A

Mitre line

25
Q

The process for laying out a wye and a tee are the same, true or false?

A

True

26
Q

What is the purpose of an offset?

A

To bypass a permanent obstruction either vertically or horizontally

27
Q

When manufacturing an offset, the length should be a minimum of how long in relation to the offset amount?

A

Minimum twice as long as the offset amount

28
Q

Angle divided by the number of pieces x 2 -2 is what formula?

A

Mitre angle formula

29
Q

The most accurate method to establishing a mitre line is what?

A

Bisecting (trisecting) an angle

30
Q

After establishing a mitre line, what can be used to ensure the angle is correct?

A

Protractor

31
Q

3.14 x diameter =

A

Stretchout

32
Q

If your mitre line was developed at 15 degrees, what would be the included angle of a middle gore?

A

30 degrees

33
Q

How many methods are there to lay out an offset?

A

4, (given throat, given heel, given centreline, bisecting the centreline)

34
Q

What 3 pieces of information must you know to lay out an offset?

A

Offset amount, opening size and vertical height

35
Q

What method is used to transfer the length of the element lines on the elevation view to the stretchout in parallel line development?

A

Projection

36
Q

When calculating small end on a fitting, always round __________ when converting from decimal to fraction?

A

Up

37
Q

What is always marked on the pattern to aid in the fabrication process?

A

Centreline

38
Q

What is the stretchout for a 7” LE with a 1/2” lap seam?

A

22 1/2”

39
Q

How is the stub developed for a rectangular on round pipe tee?

A

Divide plan view into equal increments

40
Q

What is the minimum number of points required to develop a curve?

A

3

41
Q

How many supports does a roof jack require?

A

Three supports

42
Q

What method of development is used for oblique and right cylinders?
Simple layout
Parallel line development
Triangulation
Radial line development

A

Parallel line development

43
Q

How do you calculate the tee stub stretchout on a rectangular tee?

A

2L + 2W (length + length + width + width)

44
Q

Calculate the mitre angle for a 4 piece, 3”, 90 degree elbow?

A

15 degrees

45
Q

Calculate the mitre angle for a 3 piece, 4”, 45 degree elbow?

A

11.25 degrees

2nd year sheet metal (5 decks)

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