What does section view include?
A sectional view or a section looks inside an object. Sections are used to clarify the interior construction of a part that cannot be clearly described by hidden lines in exterior views. By taking an imaginary cut through the object and removing a portion, the inside features may be seen more clearly.
What are the three types of section views?
Types of Sectional Views
- Full Section. If the imaginary cutting plane passes through the entire object, splitting the drawn object in two with the interior of the object revealed, this is called a “full section.” A full section is the most widely-used sectional view.
- Half View.
- Offset View.
- Revolving View.
- Broken View.
What should I hatch in a section view?
In section views, hatch lines (also called section lines) are used to indicate solid materials that are cut through. Some hatch pattern types are used to represent specific materials. Hatch lines are usually drawn at angles between 15o and 75o but must not be parallel or perpendicular to object visible lines.
What is section AA and BB in drawing?
typically in mechanical drafting or shop drawing contexts. That’s how we learned it when I took drafting way back in high school. There’s no set rules, but I always tried to have some sort of hierarchy (AA is the primary section, BB is the opposite axis, CC, DD etc. work down into details).
What is a section view in construction?
A ‘section drawing’, ‘section’ or ‘sectional drawing’ shows a view of a structure as though it had been sliced in half or cut along another imaginary plane.
What is section AA in drawing?
The cutting plane is represented by a cutting plane line. The cutting plane line is defined as A-A, and the section view is defined as view A-A.
Which of the following is a type of sectional view?
Explanation: A sectional view of the assembly is called the assembly section. This view gives the details when all the parts are assembled together.
When sectioning what should not be hatched?
A sectional view must not have any full lines drawn over hatched areas. As a general rule, dimensions are NOT inserted in hatched areas.
Why sectional views are used in drawing?
For mechanical drawings section views are used to reveal interior features of an object when hidden lines cannot properly represent them (e.g., with multiple interior features and excessive overlaying hidden lines). In other words, a primary reason for creating a section view is the elimination of hidden lines.
What is section BB?
In this case, the section drawing would be named ‘Section B-B’. Shading, cross hatching or other fill styles and / or thicker lines can be used to indicate parts of the structure that have been cut through, such as walls, roofs and floors.
When and why is a section view necessary?
In which case, the direction of sight is towards one half of the object. The other half is then mentally discarded. Drafters use sectional views to improve the clarity of complex objects when internal surfaces result in too many hidden lines. Special conventions are used to make a sectional view easy to understand.
What are section lines used for?
Section Lines: Used to indicate where the cutting plane cuts the material. Section lines are thin and the symbols (type of lines) are chosen according to the material of the object. Section lines are generally drawn at a 45° angle.
What type of view is AA?
section view
The cutting plane line is defined as A-A, and the section view is defined as view A-A. All surfaces directly visible must be shown in a section view. In Figure 4-43 the back portion of the object is not affected by the section view and is directly visible from the cutting plane.
What is sectional drawing?
∎ A section view is a view used on a drawing to. show an area or hidden part of an object by. cutting away or removing some of that object.
What parts on a sectional view should be hatched?
On sectional views, solid areas (areas that the cutting plane has passed through) should be hatched to indicate that they are solid. Hatching is drawn with a thin continuous line, equally spaced (preferably about 4mm apart, though never less than 1mm) and preferably at an angle of 45o.
How is sectional view obtained?
The sectional view obtained by passing the cutting plane fully through the object is called a full section. The arrows at the end of the cutting plane line indicate the direction of sight for the sectional view. The cutting plane line may be omitted if the view is in orthographic position.
What is section view drawing?
A sectional view represents the part of an object remaining after a portion is assumed to have been cut and removed. The exposed cut surface is then indicated by section lines. Hidden features behind the cutting plane are omitted, unless required for dimensioning or for definition of the part.
What is aa section?
The cutting plane line is defined as A-A, and the section view is defined as view A-A. Figure 4-42. All surfaces directly visible must be shown in a section view. In Figure 4-43 the back portion of the object is not affected by the section view and is directly visible from the cutting plane.