Radial Line Development Flashcards
What step differentiates conical layout from radial line development?
Both use a vertical apex and elevation view but radial adds the use of a plan view
What does the plan view in radial line help to develop?
Frustums of cones, cone intersections and point locations
When developing the full pattern stretch out for a cone what is used to measure the stretch out?
Pee wee tape
If the plan view is above the elevation view, you are looking at a?
Below the elevation view?
Top view
Bottom view
What application uses pipe tees on cones?
Blow pipe/dust collection systems
When laying out a pattern for a truncated cone, always draw the entire cone first and cut it off later. True or false
True
When a cone is laid out and then truncated, what is the remaining portion called?
Frustum
Which way do element lines always run?
From apex to base or base to apex
An element line that falls on the outside sloped sides of a cone are true length or foreshortened?
True length
Pipe tee on cone fittings are sometimes referred to as?
Stub Y’s
What is the preferred pipe angle on a pipe tee fitting?
30 degrees
Besides dust collection systems, where else are pipe tee on cone fittings found?
Commercial air handling
How many plan views are needed to develop all patterns for a pipe tee on cone fitting?
2-The pipe tee plan view and the conical fittings plan view
The pipe tee stretch out is developed using radial line development?
No, parallel line development
For a horizontal pipe tee on cone, what shape will the hole pattern be?
It will be shaped like a shield
For a vertical pipe tee on cone, what shape will the hole pattern be?
It will be teardrop shaped
For a 45 degree pipe tee on cone, what shape will the hole pattern be?
It will be a circle
By adding a plan view to a pipe tee on cone fitting, along with the elevation view, you can develop what?
A mitre line
What can be developed on a cone fitting once you have the mitre line?
A hole and stub pattern
A cone on pitch is usually found where?
Residential sloping roofs
Conical tees used in commercial applications usually accompany what other fitting?
Reducer
What is another name for a pipe tee on cone?
Tee on taper
A conical tee fitting used in residential is commonly called a ?
Saddle take off
How many views are required for developing a pattern for a 90 degree conical tee?
One
How many views are required when developing a pattern for a conical tee that is not 90 degrees?
Two
What is the formula for Vertical Apex?
VA=VH X LD divided by
LD - SD
Vertical apex= vertical height x large diameter divided by large diameter-small diameter
Sectional curves can be found in what fitting?
A 45° fitting
What is the minimum number of points needed to develop sectional curves?
3 points
What view is developed from the sectional curves?
The hole mitre plan view
What must be developed on the elevation view prior to creating a whole pattern stretch out?
The developed mitre
When laying out an oblique cone which lines are used to develop the views and which lines are used to develop the pattern?
The element lines are used to develop the views and true length lines are used to develop the pattern
When constructing an oblique three-way Y branch both plan and elevation views are necessary, true or false?
True
Slipping a pattern is commonly used for what 2 fittings?
Transitional elbows and offsets
What is the formula for calculating a mitre in the field?
M= Offset x Width / Length
