Indrouction To Conical Layout Flashcards
Most radial line development begins with establishing the elevation veiw and then extending the side lines until they meet at a common point called the: _________________.
Apex Point.
How many methods are used to establish the vertical apex?
Two
State the mathematical fomula to establish the vertical apex.
Vertical Height (VH) × Large Diameter(LD)
Vertical Apex(VA)= -----------------------------------------------------------
Large Diameter (LD) - Small Diameter(SD)When building a storm collar, the _______ _________ would be measured as this is the critical diameter in which pipe will have to pass through.
Small Diameter
_______ _________ are conical objects that are used to divert water away from the opening of roof jacks.
Storm Collars
Four functions of a rain cap.
- To coordinate with the design of the building.
- To keep birds, leaves and other materials out of the stack with the aid of a screen or mesh.
- To prevent rain or snow from entering the stack.
- To allow a free flow of air.
State the method of determining the height of a rain cap.
1/2 D of the pipe.
The outside Diameter of the cap must be a distance equal to ______ _______ the diameter of the pipe.
Two Times
State the formula to calculate the conical cap cut-out.
Conical cap cut-out = 6.28 x X
Caculate the following measurements for a rain cap using 8” round pipe.
- Cap height:
- Cap opening:
- Cap height above the pipe:
- 4”
- 8”
- 4”
What is the definition of a cone?
The definition of a cone is that it is a 3 dimensional object with a circle for a base that tapers to a point.
What is the best method of cone development?
Radial line development for right cones whenever possible. This is the most accurate method.
What seam can be used to fabricate a section or join sections of a project?
The lap seam can be used both as a seam or a joint between sections.
What are four types of seams used to join sections of a project?
Lap seam, peened seams, double peened seams, hammerlock seam, elbow seams.
What are three edges used on conical projects?
Wired edge, raw edge, hemmed edge, capped edge.
