section - georgia southern university-armstrong campussketching section views uses new features...
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ENGR 1170ENGR 1170
AASUAASUSectionsSections
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Sketching Section ViewsSketching Section Views
UsesUsesNew FeaturesNew Features
ExamplesExamplesCharacteristicsCharacteristics
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Uses Uses --Floor PlanFloor Plan
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Uses Uses -- Assembly DrawingAssembly Drawing
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Uses Uses -- Assembly Drawing (Full Section)Assembly Drawing (Full Section)
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Section View BasicsSection View Basics
Cutting Plane
View Direction Arrows
Cross-Hatch
Reveal part or assembly inner structure details
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Cutting Plane Line TypesCutting Plane Line TypesThick – like visible
1/8” dashes1/16” gaps
Used in this course
1/4” dashes1/16” gaps
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Cross Hatch PracticesCross Hatch PracticesNot parallel nor perpendicular to boundaries of view
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Cutting Plane Arrows and Section LocationCutting Plane Arrows and Section Location
Section View Behind Arrows -
- but may be on a separate sheet
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Full Section ExampleFull Section Example
Note - no hidden line
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No IslandsNo Islands
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Section View Section View –– Easier to InterpretEasier to Interpret
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Cross Hatch Cross Hatch -- Material SymbolsMaterial Symbols
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Section View CharacteristicsSection View CharacteristicsCutting Plane Line –
typeplacementarrowslabel
Section View –orientationpositionlabelvisible linescenter linesno hidden lines
Cross Hatch –line typeuniformline slopeonly “cut” regions
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SECTIONINGSECTIONING
Sections and sectional views are used to show Sections and sectional views are used to show hidden detail more clearly. They are created by hidden detail more clearly. They are created by using a cutting plane to cut the object.using a cutting plane to cut the object.
A section is a view of no thickness and A section is a view of no thickness and shows the outline of the object at the cutting shows the outline of the object at the cutting plane. Visible outlines beyond the cutting plane. Visible outlines beyond the cutting plane are not drawn.plane are not drawn.
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SECTIONINGSECTIONINGA sectional view, displays the outline of the A sectional view, displays the outline of the
cutting plane and all visible outlines which can cutting plane and all visible outlines which can be seen beyond the cutting planebe seen beyond the cutting plane
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SECTIONINGSECTIONING
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HATCHINGHATCHING
On sections and sectional views solid area On sections and sectional views solid area should be hatched to indicate this fact. should be hatched to indicate this fact.
Hatching is drawn with a thin continuous line, Hatching is drawn with a thin continuous line, equally spaced (preferably about 4mm apart, equally spaced (preferably about 4mm apart, though never less than 1mm) and preferably at though never less than 1mm) and preferably at an angle of 45 degrees.an angle of 45 degrees.
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HATCHINGHATCHINGHatching a single objectHatching a single object
When hatching objects with areas that are When hatching objects with areas that are separated, all areasseparated, all areas of the object should be of the object should be hatched in the same direction and with the same hatched in the same direction and with the same spacingspacing..
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Hatching Adjacent objectsHatching Adjacent objects
When hatching assembled parts, the direction When hatching assembled parts, the direction of the hatching should ideally be reversed on of the hatching should ideally be reversed on adjacent parts. adjacent parts.
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Hatching Adjacent objectsHatching Adjacent objects
If more than two parts are adjacent, then the If more than two parts are adjacent, then the hatching should be staggered to emphasize hatching should be staggered to emphasize the fact that these parts are separate.the fact that these parts are separate.
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Hatching Thin MaterialsHatching Thin MaterialsSometimes, it is difficult to hatch very thin Sometimes, it is difficult to hatch very thin sections. To emphasize solid wall the walls sections. To emphasize solid wall the walls can be filled in. This should only be used can be filled in. This should only be used when the wall thickness size is less than 1mmwhen the wall thickness size is less than 1mm
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Hatching Large AreasHatching Large Areas
When hatching large areas in order to aid When hatching large areas in order to aid readability, the hatching can be limited to the readability, the hatching can be limited to the area near the edges of the partarea near the edges of the part
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TYPES OF SECTIONINGTYPES OF SECTIONING
Sectional View in a single planeSectional View in a single plane
Sectional View in two planesSectional View in two planes
Half Sectional viewsHalf Sectional views
Part or BrokenPart or Broken--Out Sectional viewsOut Sectional views
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Sectional View in a single planeSectional View in a single plane
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The cutting plane is indicated using the line The cutting plane is indicated using the line style used for center lines, but with a thick style used for center lines, but with a thick line indicating the end of lines and any line indicating the end of lines and any change in the direction of the cutting plane. change in the direction of the cutting plane.
The direction of the view is indicated by The direction of the view is indicated by arrows with a reference letter. arrows with a reference letter.
The example shows a sectional view of the The example shows a sectional view of the cutting plane A cutting plane A -- A.A.
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Sectional View in two planesSectional View in two planes
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Half Sectional viewsHalf Sectional viewsHalf sections are commonly used to show both the Half sections are commonly used to show both the internal and outside view of symmetrical objects. internal and outside view of symmetrical objects.
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Part Sectional viewsPart Sectional views–– when small areas need to be sectioned to indicate the when small areas need to be sectioned to indicate the
important details. For example below is a part sectional view important details. For example below is a part sectional view to indicate a throughto indicate a through--hole in a plate. Notice that the line hole in a plate. Notice that the line indicating the end of the section is a thin continuous line.indicating the end of the section is a thin continuous line.
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WHICH SECTIONAL VIEW IS CORRECT?WHICH SECTIONAL VIEW IS CORRECT?
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DRAWING THREADED DRAWING THREADED PARTSPARTS
Drawing ConventionsDrawing Conventions
Threads are drawn with thin lines as shown in this illustration. When drawn from end-on, a threaded section is indicated by a broken circle drawn using a thin line.
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DRAWING THREADED DRAWING THREADED PARTSPARTS
Frequently a threaded section will need Frequently a threaded section will need to be shown inside a part. to be shown inside a part.
The two subsequent illustrations The two subsequent illustrations demonstrate two methods of drawing a demonstrate two methods of drawing a threaded section.threaded section.
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Note the conventions. The hidden detail is Note the conventions. The hidden detail is drawn as a thin dashed line. The sectional drawn as a thin dashed line. The sectional view uses both thick and thin line with the view uses both thick and thin line with the hatching carrying on to the very edges of the hatching carrying on to the very edges of the object.object.
DRAWING THREADED PARTSDRAWING THREADED PARTS
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EXERCISEEXERCISECREATE A SECTIONAL VIEW OF THE TAPCREATE A SECTIONAL VIEW OF THE TAP
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