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Sectional views in engineering drawing, Schemes and Mind Maps of Engineering Drawing and Graphics

University of Engineering and Technology Peshawar (UETP)Engineering Drawing and Graphics

Sectional views in engineering drawing are used to reveal the internal features of a component by cutting through it along a specified plane. These views help engineers and manufacturers understand complex internal structures that are not visible in standard external views. By removing a portion of the object, sectional drawings provide clarity on hidden details such as holes, ribs, and cavities, ensuring accurate interpretation and fabrication. Common types of sectional views include full section, half section, offset section, and broken-out section, each serving a specific purpose in illustrating internal details effectively.

Typology: Schemes and Mind Maps

2022/2023

Available from 03/26/2025

mohaiman-khan
mohaiman-khan 🇵🇰

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SECTIONAL VIEWS AND CONVENTIONS
1. PURPOSE OF SECTIONAL VIEWS
•To see the inner details of an object.
•Sectional views help in clarifying the interior shape of a part because in the outer
view too many hidden lines can create confusion.
•To sometimes see small cross sections of a part.
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SECTIONAL VIEWS AND CONVENTIONS

1. PURPOSE OF SECTIONAL VIEWS

  • (^) To see the inner details of an object.
  • (^) Sectional views help in clarifying the interior shape of a part because in the outer view too many hidden lines can create confusion.
  • (^) To sometimes see small cross sections of a part.

The sectioned Front View clearly shows the internal part shape.

A A

SECTION A-A

2. HOW SECTIONS ARE SHOWN

  • (^) The place from which the section is taken shall be clearly identified.
  • (^) A cutting plane, directional arrows and identification letters shall be used.
  • (^) A sectional view must show which portions of the object are solid material and which are spaces by drawing section lines in the solid parts.

A full section with the cutting plane passing straight across.

A

A SECTION A-A

A full section with the cutting plane changing direction

  • (^) Change in plane direction shall never be shown in the sectioned view.

A

A SECTION A-A

A

SECTION A-A A

  • (^) In a half section, hidden lines are usually not shown in the exterior half.
  • (^) The two halves in the sectioned view are separated by a center line.

A

SECTION A-A A

D. Rotated Section

  • (^) Used for showing cross sections of parts while saving space.
  • (^) Section is drawn on the view by rotating the section at 90o.

E. Removed Section

  • (^) Used for the same purpose as rotated section but the section is removed and placed adjacent to the drawing of the part.
  • (^) The cutting plane with reference letters shall be mentioned. A SECTION A-A

4. DRAWING PRACTICES FOR SECTIONAL VIEWS

A. Unnecessary Hidden Detail

  • (^) Hidden edges and surfaces are not shown behind the cutting plane. B. Visible Detail
  • (^) Visible edges and surfaces shall be shown behind the cutting plane.
  • (^) Shall be omitted only if the section is to be emphasized on.

Visible Edges shown (Recommended) Visible Edges not shown (Not recommended) A A^ SECTION A-A Visible Edges not shown (Recommended)

5. PARTS NOT SECTIONED

  • (^) Parts that are more easily recognized by their exterior are not sectioned.
  • (^) Bolts, nuts, screws, studs, pins, keys, cotters, rivets etc. are all fasteners and therefore shall not be sectioned. Shafts shall also not be sectioned unless inner details are required.