1. Technological Design
Section Views
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2. Sectional Views
Visualize and imaginary cutting plane through an object
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3. Section Views Sectional Views are used to:
reveal interior features of an object that are not
easily represented using hidden lines
improve the visualization of designs
clarify multi-view drawings
facilitate the dimensioning of complex features
communicate material type.
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10. Cutting Plane Lines
used to indicate where the imaginary cutting takes place.
use extra thick lines terminated by arrow heads showing the viewing direction
cutting plane lines take precedence over centre lines
identifying letters are placed near arrowheads
sub-title (Section A-A) indicates that sectional view is taken along cutting plane line A-A
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12. Section Lines
indicate the solid areas of a part that are imagined cut through
indicate the type of material from which the part is made
general-purpose section lining recommended for most drawings
thin continuous lines drawn at 45 degrees.
the spacing of the hatch lines should be consistent
distance between lines…..from 1 to 3 mm depending on dwg size
dimensions should not be placed in sectioned areas
on adjacent parts, the section lines should be drawn in opposite direction
for additional adjacent parts, any suitable angle may be used to make each part stand out separately.
shafts, bolts, pins, keyways, etc. should not be sectioned
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14. Types of Section Views Full Section
imaginary cutting plane fully through an object and half of it being removed
placed in the same position that an unsectioned view would normally occupy
i.e., a front section view would replace the traditional front view
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16. Types of Section Views Half Section
passing an imaginary cutting plane halfway through an object and one quarter of it is removed.
Hidden lines are omitted on both halves of the section view.
External features of the part are drawn on the unsectioned half of the view.
A center line, not an object line, is used to separate the sectioned half from the unsectioned half of the view.
Half section views are most often used on parts that are symmetrical, such as cylinders.
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18. Types of Section Views Broken-out Section
used to show interior features of a part by breaking away some of the object.
used instead of a half or full section view to save time.
A break line separates the sectioned from un-sectioned half of the view.
A break line is drawn free-hand to represent the jagged edge of the break.
No cutting plane line is drawn with a broken-out section view.
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20. Types of Section Views Removed Section
used to show the contours of complicated shapes such as wing and fuselage, blades for jet engines.
passing an imaginary cutting plane perpendicular to a part then revolving the cross section 90 degrees.
a removed section should be on the same sheet as the part it represents, and it should be clearly labeled.
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22. Types of Section Views Offset Sections
has its cutting plane bent at 90 degree angles to pass through important features.
Offset sections are used for complex parts that have a number of important features that cannot be sectioned using a straight cutting plane.
The cutting plane is bent at 90 degrees to pass through the hole, then bent 90 degrees again to pass through the slot.
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