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1 Period Sheet Metal > Simple Layout > Flashcards

Simple Layout Flashcards

1
Q

List the five types of layout in PD?

A
  • simple layout
    *parallel line development
    *radial line development
    *triangulation development and
    *rollation development
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2
Q

What is simple layout?

A

Patterns that are drawn directly onto metal without using any orthographic views or formal development methods.

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3
Q

What is parallel line development?

A

Many objects that have one pair of parallel sides can be developed using parallel line development.

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4
Q

Objects whose sides meet at an apex,or common center point ,may developed using ?

A

Radial line development.

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5
Q

——— method of pattern development used to develop patterns for irregular shaped objects?

A

Triangulation development.

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6
Q

What is rollation development?

A

In sheet metal work, there are short cut methods of layout.

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7
Q

When laying out the net pattern for a length of rectangular duct , three measurements are required?

A

*the duct width (W)
*the duct depth (D) and
*the duct length (L).

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8
Q

What is stretchout?

A

Is the distance around the duct.

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9
Q

To determine the overall length or stretchout of the pattern for duct use the formula?

A

2(W) + 2(D)= stretchout.

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10
Q

What is brake lines ?

A

The vertical lines that become the corners of the duct after it is folded in a brake.

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11
Q

Two measurements are required before you can begin layout the net pattern for a round pipe?

A

*the diameter (d) of the pipe and
*the length (l) of the pipe.

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12
Q

When stretchout round pipe net pattern which formula you use?

A

Pai(3.14)d=stretchout.

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13
Q

What is raw edge connection?

A

Is no allowance is added to the completed pattern.

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14
Q

What also called slip and drive or (S&d)?

A

S-cleat and drive cleat.

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15
Q

———-is a commmon connnection used for connecting residential and samaller commercial ducts?

A

S-cleat and drive -cleat.

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16
Q

The slip cleat ,sometimes called S cleat is approximately———-wide?

A

1’’

17
Q

The drive cleat is approximately———wide?

A

1 1/8’’

18
Q

The S and D connection requires a ————allowance to be added to the duct connection end of the metal?

A

1/2’’

19
Q

The standing drive connection also called?

A

CP connection.

20
Q

What is typically used for to join a smaller rectangular piece of duct to a larger piece of duct?

A

A hammerlock or a tap-in

21
Q

The allowance for hammerlock is ————- the width of the seem?

A

3 times.

22
Q

What is used in rectangular and round heavy gauge materials fitting that most likely be welded together?

A

The butt seams.

23
Q

What is lap seam ?

A

Has one piece of sheet metal lapped over the other.

24
Q

What is groove seam?

A

Is a hooked seam with a single offset.

25
Q

The Pittsburgh lock is the commonly used lock in the sheet metal trade,and the common allowance for male and female hook is ?

A

1/4’’ for male hook
3/16’’ for female hook.

26
Q

The female portion of the Pittsburgh locker room is generally placed on the?

A

Shorter side of the duct.

27
Q

What is button lock?

A

It is also commonly used for lighter gauge round and rectangular duct and is always formed in a lock forming machine.

28
Q

What is acme lock ?

A

Pipe lock is a hooked seam with a double offset.

29
Q

What is the gross pattern?

A

Is the net pattern with allowance added.

30
Q

The steps to follow to create a gross pattern for rectangular duct are ?

A

1.develop a net pattern
2.add duct seam allowances
3.add duct connections allowances
4.develop notching
5.add objects lines and labelling.

31
Q

When developing net patterns,always use ?

A

Construction lines.

32
Q

What is required to remove excess material not required in either the duct fabrication allowance or the duct connection allowance?

A

Proper notching.

33
Q

What is cut list or blank size?

A

Is a list of the pieces of metal that will be cut at the shear.

34
Q

The slip and drive duct connection only requires a ———- allowance be added to the edge of the duct or fitting?

A

1/2’’

35
Q

The duct notch radius and the transitional fitting notch are all notches used when notching for the ———- duct connection?

A

S and D.

1 Period Sheet Metal (10 decks)

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