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Sheet Metal First Year > Simple Layout ( 110102c) > Flashcards

Simple Layout ( 110102c) Flashcards

1
Q

What are 5 methods of common layout types in pattern development?

A

Simple layout
Parallel line development
Radial line development
Triangular development
Rollation development

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2
Q

What is a simple layout?

A

Patterns drawn directly onto metal without using any orthographic views

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3
Q

What is parallel line development?

A

Patterns that use a number of straight lines to create a pattern

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4
Q

What is triangulation?

A

A method of pattern development used to develop patterns for irregular objects

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5
Q

What is radial line development?

A

Objects that have a main apex point that the pattern is then developed from

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6
Q

What is a rollational development?

A

The use of a pattern that has been created and is simply rolled onto the new sheet metal

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7
Q

What is stretchout?

A

The distance around the duct (perimeter)

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8
Q

What is the formula for calculating the stretch out?

A

2 (width) plus 2 (diameter)

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9
Q

How are brake lines marked?

A

With the capital x and then marked up or down with the desired angle

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10
Q

What 2 measurements required before laying out a piece of pipe?

A

Diameter of the pipe
Length of the pipe

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11
Q

What is the formula for pipe stretchout?

A

(3.14) x ( diameter of pipe) = stretchout

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12
Q

How can raw edge connection be fastened?

A

By welding the seam

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13
Q

How wide is a slip cleat or s cleat?

A

1 inch

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14
Q

How wide is a drive cleat?

A

1 1/8 or 1.125”

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15
Q

What are the slip and drive allowances?

A

1/2 on square and rectangle
1 on round and radius fittings

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16
Q

What is another name for hammerlock seam?

A

Tap in

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17
Q

What is the allowance for a hammerlock?

A

Commonly we use a 3/4 allowance 3 (w) depending on the size of the application

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18
Q

What are the pittsburgh allowances for female and male?

A

Female 15/16 24mm
Male 1/4 5mm straight fittings and 3/16 for curved

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19
Q

Where are the female pittsburgh seam placed?

A

On the short side of the fitting

20
Q

When do we develop a gross pattern?

A

When we have to add allowances to the net pattern

21
Q

What angle do we Notch at?

A

30 degree

22
Q

What is a standing drive connection also known as?

A

Cp connection

23
Q

What is needed on slip and drive connections?

A

Proper allowances and proper notching

24
Q

What seem is commonly used for lighter gauge rectangular duct?

A

Button lock

25
Q

What are 3 measurements required when laying out the net pattern for a length of rectangular duct?

A

Duct width
Duct depth
Duct length

26
Q

What 2 measurements are required before to lay out the net pattern for a round pipe?

A

Diameter of the pipe
Length of the pipe

27
Q

What is a hammer lock used for?

A

To join a smaller rectangular duct to a larger piece like in a pto

28
Q

What is the most commonly used lock in the sheet metal trade?

A

Pittsburgh lock

But in real life Pittsburgh for commercial button lock for residential

29
Q

What is a cut list?

A

A list of pieces that will be cut at the shear

30
Q

What are used to join individual pieces of duct or fittings together?

A

Duct connections

31
Q

What type of pattern development is used for duct and pipe?

A

Simple layout

32
Q

What dimensions are required to layout the net pattern for a length of rectangular duct?

A

Duct width
Duct depth
Duct length

33
Q

What is the stretch out of a pattern?

A

The distance around the Duct

34
Q

The duct openings should be marked out along the baseline true or false?

A

True

35
Q

The length of the duct should be measured from the baseline and drawn parallel to it true or false

A

True

36
Q

Brake lines in some cases become the corners of the duct once it is folded and should be marked out on the inside whenever possible true or false

A

True

37
Q

What is not an example of a duct connection.
Raw edge connection
Groove seam
Standing drive connection
Hammerlock

A

Groove seam

38
Q

Raw edge connection requires that no allowance is added to the completed pattern true or false

A

True

39
Q

How many different cleats does the slip and drive connection use?

A

2

40
Q

Standing drive connections are primarily used on?

A

Larger ductwork

41
Q

Duct seams are used to hold the duct together true or false

A

True

42
Q

The female portion of a Pittsburgh is placed on the shorter side of the duct because of the extra stiffness it provides true or false

A

True

43
Q

What are duct connections and seam allowances?

A

Material that is added to a net pattern

44
Q

What is notching?

A

Removal of excess material not needed for fabrication

45
Q

When are object lines and labeling added to a pattern?

A

Once the gross pattern is complete

46
Q

Calculating and creating a cut list will save time and material true or false

A

True

47
Q

On transitional fittings such as a pto 1 inch of straight material is required in order to allow for the s cleat to be installed true or false

A

True

Sheet Metal First Year (31 decks)

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