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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?

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
What are 3 measurements required when laying out the net pattern for a length of rectangular duct?
Duct width Duct depth Duct length
26
What 2 measurements are required before to lay out the net pattern for a round pipe?
Diameter of the pipe Length of the pipe
27
What is a hammer lock used for?
To join a smaller rectangular duct to a larger piece like in a pto
28
What is the most commonly used lock in the sheet metal trade?
Pittsburgh lock But in real life Pittsburgh for commercial button lock for residential
29
What is a cut list?
A list of pieces that will be cut at the shear
30
What are used to join individual pieces of duct or fittings together?
Duct connections
31
What type of pattern development is used for duct and pipe?
Simple layout
32
What dimensions are required to layout the net pattern for a length of rectangular duct?
Duct width Duct depth Duct length
33
What is the stretch out of a pattern?
The distance around the Duct
34
The duct openings should be marked out along the baseline true or false?
True
35
The length of the duct should be measured from the baseline and drawn parallel to it true or false
True
36
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
True
37
What is not an example of a duct connection. Raw edge connection Groove seam Standing drive connection Hammerlock
Groove seam
38
Raw edge connection requires that no allowance is added to the completed pattern true or false
True
39
How many different cleats does the slip and drive connection use?
2
40
Standing drive connections are primarily used on?
Larger ductwork
41
Duct seams are used to hold the duct together true or false
True
42
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
True
43
What are duct connections and seam allowances?
Material that is added to a net pattern
44
What is notching?
Removal of excess material not needed for fabrication
45
When are object lines and labeling added to a pattern?
Once the gross pattern is complete
46
Calculating and creating a cut list will save time and material true or false
True
47
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
True

Sheet Metal First Year (31 decks)

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