1. Unit 2: Design Fundamentals
SPECIAL VIEWS
Unit 2: Design Fundamentals
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2. Partial or Enlarged Views
When necessary, a view of a large machine or device in its entirety may be broken into partial views on a single sheet, or extended over several sheets
used when it is desirable to show a feature in greater detail or to eliminate the crowding of details or dimensions
should be oriented in the same manner as the main view
the scale of the enlargement must be shown
When a portion of a view is enlarged for magnification purposes, the view and the enlarged view must each be labeled as separate views.
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3. Partial and Enlarged Views
a view of a large machine or device in its entirety may be broken into partial views on a single sheet, or extended over several sheets
used when it is desirable to show a feature in greater detail or to eliminate the crowding of details or dimensions
should be oriented in the same manner as the main view
the scale of the enlargement must be shown
when a portion of a view is enlarged for magnification purposes, the view and the enlarged view must each be labeled as separate views.
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6. Exploded Views
a type of drawing, that shows the intended assembly of mechanical or other parts
shows all parts of the assembly and how they fit together.
can also help to represent the disassembly of parts, where the parts on the outside normally get removed first.
shows the components of an object slightly separated by distance, or suspended in surrounding space
represented as if there had been a small controlled explosion emanating from the middle of the object, causing the object's parts to be separated an equal distance away from their original locations.
used in parts catalogues, assembly and maintenance manuals and other instructional material.
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8. Sectional Views
Visualize and imaginary cutting plane through an object
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9. 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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16. 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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18. 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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20. 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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21. 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 is used to separate the sectioned half from the unsectioned half of the view.
most often used on parts that are symmetrical, such as cylinders.
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22. 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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