Unit 2: Design Fundamentals SPECIAL VIEWS Unit 2: Design Fundamentals Footer Text 5/21/2019

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. Footer Text 5/21/2019

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. Footer Text 5/21/2019

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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. Footer Text 5/21/2019

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Sectional Views Visualize and imaginary cutting plane through an object 5/21/2019

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. 5/21/2019

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 5/21/2019

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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 5/21/2019

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 5/21/2019

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. 5/21/2019

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 5/21/2019