Simple Layout Flashcards
List the five types of layout in PD?
- simple layout
*parallel line development
*radial line development
*triangulation development and
*rollation development
What is simple layout?
Patterns that are drawn directly onto metal without using any orthographic views or formal development methods.
What is parallel line development?
Many objects that have one pair of parallel sides can be developed using parallel line development.
Objects whose sides meet at an apex,or common center point ,may developed using ?
Radial line development.
——— method of pattern development used to develop patterns for irregular shaped objects?
Triangulation development.
What is rollation development?
In sheet metal work, there are short cut methods of layout.
When laying out the net pattern for a length of rectangular duct , three measurements are required?
*the duct width (W)
*the duct depth (D) and
*the duct length (L).
What is stretchout?
Is the distance around the duct.
To determine the overall length or stretchout of the pattern for duct use the formula?
2(W) + 2(D)= stretchout.
What is brake lines ?
The vertical lines that become the corners of the duct after it is folded in a brake.
Two measurements are required before you can begin layout the net pattern for a round pipe?
*the diameter (d) of the pipe and
*the length (l) of the pipe.
When stretchout round pipe net pattern which formula you use?
Pai(3.14)d=stretchout.
What is raw edge connection?
Is no allowance is added to the completed pattern.
What also called slip and drive or (S&d)?
S-cleat and drive cleat.
———-is a commmon connnection used for connecting residential and samaller commercial ducts?
S-cleat and drive -cleat.
The slip cleat ,sometimes called S cleat is approximately———-wide?
1’’
The drive cleat is approximately———wide?
1 1/8’’
The S and D connection requires a ————allowance to be added to the duct connection end of the metal?
1/2’’
The standing drive connection also called?
CP connection.
What is typically used for to join a smaller rectangular piece of duct to a larger piece of duct?
A hammerlock or a tap-in
The allowance for hammerlock is ————- the width of the seem?
3 times.
What is used in rectangular and round heavy gauge materials fitting that most likely be welded together?
The butt seams.
What is lap seam ?
Has one piece of sheet metal lapped over the other.
What is groove seam?
Is a hooked seam with a single offset.
The Pittsburgh lock is the commonly used lock in the sheet metal trade,and the common allowance for male and female hook is ?
1/4’’ for male hook
3/16’’ for female hook.
The female portion of the Pittsburgh locker room is generally placed on the?
Shorter side of the duct.
What is button lock?
It is also commonly used for lighter gauge round and rectangular duct and is always formed in a lock forming machine.
What is acme lock ?
Pipe lock is a hooked seam with a double offset.
What is the gross pattern?
Is the net pattern with allowance added.
The steps to follow to create a gross pattern for rectangular duct are ?
1.develop a net pattern
2.add duct seam allowances
3.add duct connections allowances
4.develop notching
5.add objects lines and labelling.
When developing net patterns,always use ?
Construction lines.
What is required to remove excess material not required in either the duct fabrication allowance or the duct connection allowance?
Proper notching.
What is cut list or blank size?
Is a list of the pieces of metal that will be cut at the shear.
The slip and drive duct connection only requires a ———- allowance be added to the edge of the duct or fitting?
1/2’’
The duct notch radius and the transitional fitting notch are all notches used when notching for the ———- duct connection?
S and D.
