Chapter 3 Sectioning - Union Collegeantipasto.union.edu/~tchakoa/mer101/Sectioning.pdf ·...
Transcript of Chapter 3 Sectioning - Union Collegeantipasto.union.edu/~tchakoa/mer101/Sectioning.pdf ·...
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Chapter 3Sectioning
Basic TopicsAdvanced Topics
Exercises
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Sectioning: Basic TopicsSummary3.1) Sectional Views3.2) Types of Sections
3.2.1) Full section3.2.2) Half section3.2.3) Offset section
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Sectioning: Advanced Topics3.2) Types of Sections
3.2.4) Aligned section3.2.5) Rib and web sections3.2.6) Broken section3.2.7) Removed section3.2.8) Revolved section3.2.9) Non-sectioned parts3.2.10) Thin sections
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SummaryWhat will we learn in Chapter 3?→ How to create various types of sectional
views. (Sectional views allow you to see inside an object.)
Key points→ Using a sectional view can be very useful
for parts that have complex interior geometry.
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Sectioning
3.1) Sectional Views
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Sectional ViewsA sectional view or section looks inside an object. → Sections are used to clarify the interior
construction of a part that can not be clearly described by hidden lines in exterior views.
→ By taking an imaginary cut through the object and removing a portion, the inside features may be seen more clearly.
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Sectional ViewsWhat is this? An ugly rock?
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Sectional ViewsA pretty rock?
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Creating a Section ViewThe part is cut using an imaginary cutting plane.
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Creating a Section ViewThe unwanted portion is mentally discarded exposing the interior construction.
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Section Example
Notice how the cutting plane is indicated.
Notice how the cut material is shown.
Sectional view label
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Lines Used in Section ViewsCutting Plane Line: Used to show where the object is being cut.→ (Phantom line type)
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Lines Used in Section ViewsShows where the part is being cut.
Arrows point to the portion being kept.
Section Lines
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Lines Used in Section ViewsSection Lines: Section lines are used to indicate where the cutting plane cuts the material. → Section lines are thin lines. → Section line symbols are chosen according
to the material of the object → Section lines are generally drawn at a 45°
angle.
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Lines Used in Section ViewsCommon Section Line Symbols
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Lines Used in Section ViewsCommon Section Line Symbols
More section line symbols shown in Fig. 3-4 on page 3-5
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Rules of SectioningRule 1:A section lined area is always completely bounded by a visible outline.
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Rules of SectioningRule 2:The section lines in all areas should be parallel.→ Section lines
shown in opposite directions indicate a different part.
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Rules of SectioningRule 3: All the visible edges behind the cutting plane should be shown.
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Rules of SectioningRule 4:Hidden features should be omitted in all areas of a section view.→ Exceptions include
threads and broken out sections.
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Sectioning
3.2) Types of Sections
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Types of SectionsThe type of section used depends on the situation and what information needs to be conveyed.
Types of sections→Full Section→Half Section→Offset Section→etc …
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Full SectionTo create a full section, the cutting plane passes fully through the object.→ Used in many cases to avoid having to
dimension hidden lines.
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Exercise 3-1
Full Section
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Exercise 3-1Given the top and right side views, sketch the front view as a full section. → The material used is steel.
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Fill in the visible lines in the front full sectional view
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Fill in the section lines in the front full sectional view
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Section lines are bounded by visible lines
Visible features behind the cutting plane are shown.
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Half SectionA half sectionexposes the interior of one half of an object while retaining the exterior of the other half.
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Half SectionHalf sections are used mainly for symmetric objects or assembly drawings.
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Half SectionA centerline is used to separate the two halves.
Hidden lines should not be shown on either half.
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Exercise 3-2
Half Section
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Exercise 3-2Given the front and right side views, sketch the top view as a full section and create a half sectioned front view.→ The material is brass.
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Fill in the visible lines in the top full section view.
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Fill in the section lines in the top full section view.
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Fill in the visible lines in the right side half section view.
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Fill in the section lines in the right side half section view.
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No hidden lines
Center line divides the halves
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Offset SectionAn offset section is produced by bending the cutting plane to show features that don’t lie in the same plane.
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Exercise 3-3
Offset Section
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Exercise 3-3Given the front and top views, sketch the three missing section views in their appropriate places. The material is cast iron.
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Aligned SectionIn order to include angled elements in a section, the cutting plane may be bent so that it passes through those features.
Skip advanced topic
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Conventions of RevolutionFeatures are revolved to the projection plane, and then projected over.
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Exercise 3-4
Aligned Section
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Exercise 3-4Given the front and unrevolved right side views, sketch the right side view as an aligned section using the conventions of revolution. The material is cast iron.
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Fill in the visible lines in the sectional view.
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Fill in the section lines.
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Notice how much clearer the sectional view is.
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Rib and Web SectionsTo avoid a false impression of thickness and solidity, ribs and webs are not sectioned.
Cutting plane passes through the web
No section lines in cut area of web
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Rib and Web SectionsIf the cutting plane passes crosswise through the rib or web, we include section lines.
Cutting plane passes through the web
Section lines in cut area of web
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Broken SectionSometimes only a partial or broken outsection is needed.→ Hidden lines are shown in the non-sectioned
area of a broken section.
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Removed SectionA removed section is one that is not in direct projection of the view containing the cutting plane.
Not in projection path
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Removed Section
Removed section should be labeled with name and scale.
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Revolved SectionThe cross sectional shape of an object may be shown in the longitudinal view by means of a revolved section.
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Non – Sectioned PartsIt is common practice to show standard parts 'in the round' or un-sectioned.→ Nuts→ Bolts→ Rivets→ Shafts→ Screws
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Thin SectionsFor extremely thin parts of less than 4 mm thickness, the parts should be shown in solid black or without section lines.→ Sheet metal → Washers→ Gaskets
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Sectioning
The End