Sections and sectional views

A section is used to show the detail of a component, or an assembly, on a particular plane which is known as the cutting plane. A simple bracket is shown in Fig. 8.1 and it is required to draw three sectional views. Assume that you had a bracket and cut it with a hacksaw along the line marked B-B. If you looked in the direction of the arrows then the end view B-B in the solution (Fig. 8.2), would face the viewer and the surface indicated by the cross hatching would be the actual metal which the saw had cut through. Alternatively had we cut along the line C-C then the plan in the solution would be the result. A rather special case exists along the plane A-A where in fact the thin web at this point has been sliced. Now if we were to cross hatch all the surface we had cut through on this plane we would give a false impression of solidity. To provide a more realistic drawing the web is defined by a full line and the base and perpendicular parts only have been cross hatched. Note, that cross hatching is never undertaken between dotted lines, hence the full line between the web and the remainder of the detail. However, the boundary at this point is theoretically a

Engineering Drawing Exam

dotted line since the casting is formed in one piece and no join exists here. This standard drawing convention is frequently tested on examination papers.

Cutting planes are indicated on the drawing by a long chain line 0.35 mm thick and thickened at both ends to 0.7 mm. The cutting plane is lettered and the arrows indicate the direction of viewing. The sectional view or plan must then be stated to be A-A, or other letters appropriate to the cutting plane. The cross hatching should always be at 45° to the centre lines, with continuous lines 0.35 mm thick.

If the original drawing is to be microfilmed successive lines should not be closer than 4 mm as hatching lines tend to merge with much reduced scales. When hatching very small areas the minimum distance between lines should not be less than 1 mm.

In the case of very large areas, cross hatching may be limited to a zone which follows the contour of the hatched area. On some component detail drawings it may be necessary to add dimensions to a sectional drawing and the practice is to interrupt the cross hatching so that the letters and numbers are clearly visible.

Section Views Engineering Drawings
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Responses

  • FREDRIK
    What is meaning of AA & BB SECTIONS IN DRAWINGS?
    3 years ago
  • Diana
    What is the distance between section line in engineering drawing?
    2 years ago
  • Ted
    How to shade in sectional drawing?
    2 years ago
  • Wilimar
    Can we draw dotted line in section view?
    2 years ago
  • brittany
    What is the definition of section thru aa?
    2 years ago
  • azzeza ermias
    How to interpret sectional drawing?
    2 years ago
  • SANDRA JAEGER
    How can sectioning be carried out in engineering drawing?
    2 years ago
  • SAMUEL
    What are the distance between hatching line in enginering drawing?
    2 years ago
  • yvonne
    What is meant by views and sections in engineering drawing?
    2 years ago
  • Matthew
    How to section in mechanical drawing?
    2 years ago
  • Pia
    How to master engineering drawing sectional views?
    2 years ago
  • fastolph
    What Is Section Line In Engineeting Draeing?
    2 years ago
  • AILIE
    How to draw sectional view of drawings?
    2 years ago
  • domenica
    How to master sectioning in drawing N2?
    2 years ago
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    How to shade a section in technical drawing?
    2 years ago
  • Estelle
    What is the differrent between hatching lines and section lines?
    2 years ago
  • dirk
    How to make section in mechanical drawings?
    2 years ago
  • christopher
    When hatching a sectional view in an engineering drawing?
    2 years ago
  • Francis
    What is sections in technical drawing?
    2 years ago
  • lempi
    What is cross section in engineering graphics?
    2 years ago
  • SADOC
    How many so tha seaction of drawing?
    2 years ago
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    What is meant by section view in mechanical drawing?
    2 years ago
  • STEFANIE
    How about sectioning views?
    2 years ago
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    What is sectioning in technical drawing?
    2 years ago
  • codi hayes
    What meaning of km 10x25 DIN 74 in counter bor in engineering drawing?
    2 years ago
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    What is section types of section and define(engineering drawing)?
    2 years ago
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    What is section in enginerring drawing ?
    2 years ago
  • walter
    What is the meaning of section view aa?
    1 year ago
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    What is section in EngineeringDrawing?
    1 year ago
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    1 year ago
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    1 year ago
  • PERVINCA
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    1 year ago
  • Daniela
    How to hatch a sectional top view in engineering graphics and design?
    1 year ago
  • Nereo
    How meny section in engineering drawing?
    1 year ago
  • editta
    What is section view explain in detail?
    1 year ago
  • Gisella Lorenzo
    How to understand sectioning in drawingN2?
    1 year ago
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    What are three names of component that are usually not sectioned in technical drawing?
    1 year ago
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    1 year ago
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    1 year ago
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    1 year ago
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    How to do a full sectional front view on cutting plane AA?
    1 year ago
  • Kimmo
    What is cross sectional drawing definition engineering drawing?
    11 months ago
  • christine
    What is the AA section in techincal drawings?
    11 months ago
  • eric
    Why section a component in a sectionbal plan?
    11 months ago
  • janice
    What is sectional and section view?
    11 months ago
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    How to understand section views?
    10 months ago
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    What is sectional line in graphice?
    10 months ago
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    10 months ago
  • brhane
    What is section or sectional views?
    10 months ago
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    How to do a section aa on engineering drawing solidworks?
    10 months ago
  • ELEUTERIO
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    10 months ago
  • Shannon
    What is a cross sectional view?
    9 months ago
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    What is the distance between two section line in engg drawing?
    9 months ago
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    Which type of pencil is used for sectioning?
    8 months ago
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    8 months ago
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    8 months ago
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    7 months ago
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    6 months ago
  • Lucas
    How would a sectional view drawing be used to do tolerance?
    6 months ago
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    Are sections always defined in plan view?
    6 months ago
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    What is CROSS SECTION VIEW NOTATION in engineering drawings?
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    5 months ago
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    1 month ago
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    24 days ago
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    23 days ago
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    22 days ago
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    22 days ago
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    What is CrossSectional Views.?
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    8 days ago
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    7 days ago
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    How to view cutting section in engineering drawings?
    2 days ago

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