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BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt1
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Bruce Mayer, PERegistered Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engineering 22
SectionSectionViews-2Views-2
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt2
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Learning GoalsLearning Goals
Properly Create Section (Cut-Away) Views to Show Internal Features Of Objects That Are Not Easily Understood In Standard Orthographic Projection View Drawings
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt3
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Learning Goals Learning Goals contcont
Use and/or Apply• How & Where to Construct the Cutting
Plane Line
• Section Lines (a.k.a. “Hatch Lines”)
• Several Types of Section Drawings
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt4
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Section Drawing TypesSection Drawing Types
Full Section (done so far) Half Section Offset Section Broken-Out Section Revolved Section Removed Section Special Section
Conventions
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt5
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Full SectionFull Section
The cutting plane passes completely through the part as a single flat plane
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt6
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Half SectionHalf Section The cutting plane only passes half way through the
part The other half is drawn as usual Hidden lines are not shown on either half of the part A center line is used to separate the two halves Mostly used on cylindrical parts
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt7
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Offset SectionOffset Section The multiview drawing is often difficult to interpret
when there are several hidden features on the object A sectioned view makes the object much easier to
understand An offset section allows the cutting plane to pass
through all of the significant internal features There may be several bends/kinks in the cutting plane
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt8
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Offset Section contOffset Section cont The actual part would show a new visible line
(at the edge) at the bend in the cutting plane • Since the cutting plane bend is arbitrary, do not
show the line representing this bend in the sectioned drawing
Hidden lines are NOT shown
Be sure to include object lines BEHIND the cutting plane
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt9
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Broken Out SectionBroken Out Section
Only a portion of the view is sectioned A jagged break line is used to divide the
sectioned and unsectioned portion of the drawing
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt10
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Revolved SectionRevolved Section A cross section of the part is revolved 90° and
superimposed on the drawing A jagged break line may be used to divide the revolved
section from the rest of the drawing
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt11
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Revolved Section CaveatsRevolved Section Caveats Superimposition of Rev-Sec
requires Removal of All ORIGINAL Lines Underneath the Section
Retain the TRUE-SHAPE of the Rev-Sec Regardless of the Line-Direction in the Visible-View
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt12
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Removed SectionRemoved Section Similar to the revolved section
except that the sectioned drawing is not superimposed on the drawing but placed adjacent to it
The view and the cutting plane are labeled (Sec. A-A)
The removed section may be drawn at a different scale• Very Useful for Detailing Small
Parts or Features
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt13
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Intersections - WindowsIntersections - Windows
a) The Offset of the intersection from the Visible Lines is SMALL or Negligible• Can DisRegard the True
Projection and Align to Vis-Lines
b) The Larger Intersection Does Have a Substantial Offset From the Visible Lines• Use the True-Projection to
position the intersection
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt14
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Intersections - PortHolesIntersections - PortHoles
c) The Offset of the intersection from the Visible Lines is SMALL or Negligible• Can DisRegard the True
Projection and Align to Vis-Lines
d) Larger Intersections• For the Smaller Hole Use Tube OD
(R1) and ID (r1) Arc at Depth Found by True Projection
• For Hole K, rk = r1, SemiEllipses of Intersection appear asStraight-Lines
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt15
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Special SectionsSpecial Sections There are special rules (conventions) that are followed
to make some parts more understandable Some features are rotated to their TRUE RADIAL
position in sectioned views The object is difficult to
understand using standard multiview drawings where hidden lines are used to represent internal features
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt16
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Special Sections contSpecial Sections cont Many Times If a part is sectioned as it would actually
appear if cut, the details of Features such as ribs and holes may not be clear
Since the goal is to make the drawing easy to interpret the drawing is modified by the following std conventions• The cutting plane shows that the features are revolved to their
true radial position• Hidden features are not shown• The sectioned drawing
produced is a DISTORTED, but CLEARER, picture of the object
• The section drawing appears as a full section
• The arrows show the directionof the view
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt17
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Special Sections contSpecial Sections cont Ribs/Webs are not
sectioned when the cutting plane passes through them lengthwise
Ribs are sectioned if the cutting plane passes through them at other orientations
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt18
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
SpecialSpecialSectionsSectionscontcont
The side view is replaced by a full section view The cutting plane shown in the Front view shows the
direction of the line of sight The holes and ribs have been revolved to their true
radial position The ribs are not sectioned in this orientation The section lines are all drawn at the same angle
since the object is one solid part
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt19
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Conventional Breaks
Use Conventional Breaks to Shorten an Elongated Object
“Jagged” Lines are used to Break Non-Circular Cross-section Objects
“S” Breaks are Preferred for Cylindrical Objects
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt20
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Demo – Pipe IntersectionDemo – Pipe Intersection
Let’s make a Cross Section for a Drilled, Thick-Walled Pipe
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt21
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Final ResultFinal Result
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt22
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
All Done for TodayAll Done for Today
Blue PrintCrossSec
Circa 1862
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt23
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Bruce Mayer, PELicensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engr/Math/Physics 25
AppendiAppendixx
6972 23 xxxxf
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt24
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Intersect Demo Intersect Demo
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt25
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Intersect Demo Intersect Demo cont cont
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt26
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Hatch Procedure-1Hatch Procedure-1
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt27
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Hatch Procedure-2Hatch Procedure-2
Hatch DiaLog Box
4
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt28
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Hatch Procedure-3Hatch Procedure-3
Pick Hatch Areas by Clicking ONCE ANYwhere within the Region
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt29
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Hatch Procedure-4Hatch Procedure-4
BMayer@ChabotCollege.edu • ENGR-22_Lec-12_Section-Views-2.ppt30
Bruce Mayer, PE Engineering 22 – Engineering Design Graphics
Hatch Procedure-5Hatch Procedure-5
All Done
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