Parallel Line Development Flashcards
What is standard practice for dividing a circle?
Dividing it into 12 equal pieces
The quadrant lines for locating the center of a circle give you what? What gives you the rest?
4 element lines, bisecting the quadrants
Another name for side view
Elevation view
A “bird’s eye” view or top-down view is called what?
Plan view
One way of indicating element points behind one another is?
Put the hidden points in brackets
Element points go in clockwise or counterclockwise around the circle
Clockwise
Extra element points are named? What are they for
Primes identify points related to another point to indicate different ends of a line.
What is a step off distance.
Distance on a stretch out line representing distance between element points
What is a net pattern
A pattern without allowances
What is a gross pattern
A pattern with allowances for fabrication
The element lines of what view are generally true lengths?
Elevation
How do the element lines on plan views appear to look like?
Points
If the top and bottom of the view are identical what can be used?
Half plan view
Intersection of two pipes at an angle is known as what?
Pipe tee
What is developed for objects cut off at an angle? What is the line that represents it?
Miter and miter line
What is a stretch out
Is the length of any pattern.
Why is it common practice to put the stretchout line at right angles of the element lines.
So that it shows the element lines in true length.
Min views required to develop pattern with PLD.
2
The perimeter of a pattern is found in what view? Formula for the perimeter.
Plan view, diameter times pie. Perimeter=stretchout
What is the view that shows height and length, true lengths of elements representing the height is what?
Elevation view, usually the quickest and most accurate place to start.
Lines projected from view to view or view to pattern are called? Drawn in _____weight?
Projection lines
construction
PLD uses the same steps for any object developed with this method? True or false
False
You can develop patterns for spherical objects using PDL
True
To properly develop a PDL pattern, you must have the true length of what?
Element lines
What info is needed to develop a pipe tee
Angle, height, and diameter of stub
Diameter length of body
Tee and wye’s on center means?
The intersection in the middle of the duct
Tee’s or wye’s off center means
The intersection of the pipes is off to one side
Formula for developing a retangluer stretch out
2L+2W
2×Length + 2×width
