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ENGR 111 9.2
Sectioned Views
Thursday, October 28 th 2004
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Learning ObjectivesList and recognize by name; symbol; and ANSI number these materials:
- Cast Iron - Aluminum - Brass, Bronze,- Steel - Zinc or Copper
Identify a drawing as being a:- Full Section - Offset Section - Revolved Section
- Half Section - Broken-Out Section - Removed SectionGiven an orthographic view; draw section views:
- In Pencil or - In AutoCADUse revolutions and partial views (as conventionalpractices) to construct sectional views of an object.List the parts of a drawing which do not getcrosshatched, even if the cutting plane passes throughthem.Sketch a cutting plane for any of the sections listedabove
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R eadiness A ssessment T est 9.2.1
Individually answer the followingquestions. You will be given 2minutes:
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R eadiness A ssessment T est 9.2.1
Individually answer the followingquestions. You will be given 2minutes:List 4 types of sectional views.
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Team Discussion Item
As a team, discussing the followingquestion:
What is the purpose of sectionalviews?
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Purpose of SectionsShow internal detailReplace complexorthographic viewsDescribe materialsin an assemblyDepict assembly of parts
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Sectioning PracticesDifferent parts at different anglesHatch spacing of about 1/16-1/8
Cutting plane line .020 wide (bold)Section or hatch lines -- thin .007Visible lines -- wide .015
Not parallel or perpendicular toboundary
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When sectioningan assembly of several parts,draw section linesat varying anglesto distinguish
separate parts.
Sectioning Practices
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Most commonANSI Material Patterns
ANSI 31 -- Cast Iron, General
ANSI 32 -- SteelANSI 33 -- Brass, Bronze,
Copper
ANSI 38 -- Magnesium,Aluminum
Earth
ANSI No. Name Pattern
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What is ANSI?
.
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Available Hatch Patterns inAutoCAD
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Cutting PlaneT he sight arrows atthe end of the cuttingplane are alwaysperpendicular to thecutting plane.Line thickness of thecutting plane is thesame as the visible
object line.T he direction of thearrow indicates theline of sight.
CUTTING PLANE LINE
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Types of Sections..Fig #:Broken-out section6.3Conventional breaks.6.4
Full section..6.5Half section..6.8Revolved section..6.10
Removed section..6.11Offset section....6.12
(See Essentials of Engineering Design Graphics by Vinson for figure references)
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Full SectionCutting planepasses throughentire object
Hidden lines areomittedVisible linesbehind thecutting plane mustbe shown
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Individual Exercise (7 min)Sketch a full section of the object shown below
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Individual Exercise (7 min)Were you correct ?
What material (hatch pattern) did you use?
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A quarter of assembly removedHalf of view is cross-hatched
Half section:HA LF SECTION
ALL hidden lines may be omittedCenter line divides halvesCenter line remains only if associated feature
is sectioned
CUTTING PLANE LINE
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Bend the cutting plane to show morefeatures
Offset section: CUTTING PLANE LINE
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Sectional view does not denote locationof offset
Offset section: CUTTING PLANE LINE
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Show cross- sections by rotating sections 90o
T he section view stays on the object.
R evolved section:
Without breaks
With breaks
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B roken out section:Used to section a small portion of the objectDoes not modify the rest of the view
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Conventional PracticesConventional practices are accepteddrawing techniques that violate therules of orthographic projectionT hey are designed to simplifyorthographic drawing of complexfeatures.
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Aligned Parts:Arms Lugs
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Aligned Parts:
Single Arm R ibs & Holes
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Parts Not Sectioned.Dont crosshatch (even though thecutting plane may pass thru them): Ribs, webs, spokes T hin parts like gaskets Ball bearings, roller bearings Most vendor items:
y Bolts y Washers y Shaftsy Nuts y Screws y Pins
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Partial Views
Use partial views to conserve spaceWhich half depends on whether yousection the view or not.
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Conventional breaks:.For extremely large parts
CR LL YMB L LI TI B LT
RT BR K LI
LI FT
CYLI RIC L BR K
LL W PIP
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Crosshatching in AutoCAD
AutoCAD canapply a givenpattern to fillan areaT he area mustbe a closedareaT o fill the areause theBHA T CHcommand.
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Pair Homework Assignment
Drawings (in AutoCAD): 28 all 29 all 32 a, b, c 34 all
Due: Beginning of class 10.2
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Stop
