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- When sketching an object or part that requires a sectional view, they are drawn by eye at an angle of approximately 45 degrees, and are spaced about 1/8” apart. Since they are used to set off a section, they must be drawn with care. It is best to use the symbol for the material being shown as a section on a sketch.
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- Full Sections. A Full section view is where the entire part or assembly is cut on a single plane. The generated section view that is created may form part of the same view as the reference view, permitted the correct projection method (first or third angled projection) is used.
- Half Section. The half section view may be used where a part or assembly is symmetrical about the centerline of the part or assembly. This will save space on the drawing with over population of reference and section views.
- Partial Section. A Partial section is used when only a certain portion of a part or assembly is cut in order to show important detail or geometry. The whole part or assembly is not sectioned as that may minimize the other information show.
- Revolved Section. A revolved section is a section that is made at a certain point in a part and revolved 90° to show the cross section of the part. The part can be broken to show the revolved section or the revolved section can be superimposed on the part itself.
In Figures 3.1.3, 3.1.4 and 3.1.6 you will have noticed the use of 3 line-types: continuous (solid), dashed and dash-dot. Based on their purpose they are commonly referred to as: visible, hidden and centre lines. By convention: all edges of a part which are fully visible in a particular view, must be
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- General Principles
- Section Lines and Symbols
- Cutting Planes
- Main Principles of Placement of Sectional Views
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.Section lines, or hatching, that represent the cut surface usually consist of thin parallel lines, as shown below, drawn at an angle of approximately 45° to the principal edges or axes of the part. For most purposes, the general use symbol of cast iron is used. When it is desired to indicate differences in materials, for example on assembly drawing...
Cutting plane lines which show where the cutting plane passes through the object, represent the edge viewof the cutting plane and are drawn in the view(s) adjacent to the section view. Here the cutting plane is drawn as an edge in the top view, which is adjacent to the sectioned front view. This is a frontal cutting plane. Lines of sight should alw...
Whenever practicable, and except for revolved sections, you should project sectional views perpendicular to the cutting plane and place it in the normal position for third angle projection.You should never show the views in first angle projected position on a third angle projection drawing.When the preferred placement is not practical you may remove the sectional view to some other convenient position on the drawing, but it must be clearly identified, usually by two capital letters,...Normally, you should not change orientation of the view, but if this becomes necessary, you must state the number of degrees through which it is revolved.This section will cover the different types of section views, corresponding technical vocabulary, and help you determine which section view would best communicate important aspects of an object or assembly to others.
This manufacturer’s drawing, using both full and half section, illustrates the advantages of sectional views. The different line directions indicate different parts and materials used in the assembly of this valve. Quiz. Directions: On a separate sheet of paper, complete the section view. Broken Out Sections.
The section marker on the plan will reference the drawing number of the section and the layout sheet it is located on. Sections will often show an indication of structure, foundations and so on – but the amount of information shown will depend on the stage of design.
Jun 28, 2022 · This manufacturer’s drawing, using both full and half section, illustrates the advantages of sectional views. The different line directions indicate different parts and materials used in the assembly of this valve. Quiz. Directions: On a separate sheet of paper, complete the section view.
