Simple Layout

Question 1

List the five types of layout in PD?

Answer 1

• simple layout
  *parallel line development
  *radial line development
  *triangulation development and
  *rollation development

Question 2

What is simple layout?

Answer 2

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

Question 3

What is parallel line development?

Answer 3

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

Question 4

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

Answer 4

Radial line development.

Question 5

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

Answer 5

Triangulation development.

Question 6

What is rollation development?

Answer 6

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

Question 7

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

Answer 7

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

Question 8

What is stretchout?

Answer 8

Is the distance around the duct.

Question 9

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

Answer 9

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

Question 10

What is brake lines ?

Answer 10

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

Question 11

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

Answer 11

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

Question 12

When stretchout round pipe net pattern which formula you use?

Answer 12

Pai(3.14)d=stretchout.

Question 13

What is raw edge connection?

Answer 13

Is no allowance is added to the completed pattern.

Question 14

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

Answer 14

S-cleat and drive cleat.

Question 15

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

Answer 15

S-cleat and drive -cleat.

Question 16

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

Answer 16

1’’

Question 17

The drive cleat is approximately———wide?

Answer 17

1 1/8’’

Question 18

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

Answer 18

1/2’’

Question 19

The standing drive connection also called?

Answer 19

CP connection.

Question 20

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

Answer 20

A hammerlock or a tap-in

Question 21

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

Answer 21

3 times.

Question 22

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

Answer 22

The butt seams.

Question 23

What is lap seam ?

Answer 23

Has one piece of sheet metal lapped over the other.

Question 24

What is groove seam?

Answer 24

Is a hooked seam with a single offset.

Question 25

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

Answer 25

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

Question 26

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

Answer 26

Shorter side of the duct.

Question 27

What is button lock?

Answer 27

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

Question 28

What is acme lock ?

Answer 28

Pipe lock is a hooked seam with a double offset.

Question 29

What is the gross pattern?

Answer 29

Is the net pattern with allowance added.

Question 30

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

Answer 30

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

Question 31

When developing net patterns,always use ?

Answer 31

Construction lines.

Question 32

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

Answer 32

Proper notching.

Question 33

What is cut list or blank size?

Answer 33

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

Question 34

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

Answer 34

1/2’’

Question 35

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

Answer 35

S and D.