What is development of surfaces in engineering drawing?
What is development of surfaces in engineering drawing?
A development is the unfold / unrolled flat / plane figure of a 3-D object. It is also called a pattern where the plane may show the true size of each area of the object. When the pattern is cut, it can be rolled or folded back into the original object as shown in figure 1.
What is the importance of surface development?
Surface development is the process of mapping a given 3D surface into a 2D shape. The usual objective is to achieve this mapping while preserving isometry, or, for non-developable surfaces, to minimize the distortion.
What are the methods of development of surfaces?
Methods of development of surfaces are:
- ➢ Parallel line development.
- ➢ Radial line development.
- ➢ Triangulation development.
- ➢ Approximate development.
What is the principle of development of surface?
The development of surface of an object means the unrolling or unfolding of all surfaces of the object on a plane. Principle of development: Every line on the development should show the true length of the corresponding line on the surface which is developed.
What are the principles of surface development?
What are the types of development in technical drawing?
The three procedures commonly used in developing patterns are parallel-line, radial-line, and triangular development.
How do you find the angle of a surface development?
To calculate the dimensions of the development, first the slant height of the cone must be found from Pythagoras’ theorem, ie R = √ [ H^2 + ( D/2 )^2]. The sector angle θ is found from the formula θ = D x ( 180 / R ), which gives θ in degrees.
What is development of lateral surface?
In gen- eral, the development of lateral surface of a cylinder is a rec- langle having one side equal to the circumference of its base circle and the other equal to its length.
What are the two types of pattern development?
Some general patterns of development are:
- Cause and Effect details why something happens, what causes it, what are the effects and how it is related to something else.
- Classification and Division groups items into their parts or types.
What are the 5 patterns of development?
Patterns of Development Overview
- Narration. The purpose of narration is to tell a story or relate an event.
- Description.
- Example.
- Definition.
- Process Analysis.
- Classification/Division.
- Comparison/Contrast.
- Cause/Effect.
What are the 4 patterns of development?
These four methods of development—cause and effect, problem-solution, chronology or narrative, and comparison and contrast—are just a few ways to organize and develop ideas and content in your essays.
What are methods of development?