Bruce Mayer, PE
Registered Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engineering 22 – Engineering Design Graphics
1
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Learning Goals
 Properly Create Section
(Cut-Away) Views to Show
Internal Features Of Objects
That Are Not Easily
Understood In
Standard
Orthographic
Projection View Drawings
Engineering 22 – Engineering Design Graphics
2
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Learning Goals cont
 Use and/or Apply
• How & Where to Construct the Cutting
Plane Line
• Section Lines (a.k.a. “Hatch Lines”)
• Several Types of Section Drawings
Engineering 22 – Engineering Design Graphics
3
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Section Views
 Definition: An Orthographic Technical
Drawing That Reveals Details About
INTERNAL Features By Displaying The
Part As If Cut By An Imaginary Plane
Engineering 22 – Engineering Design Graphics
4
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Section Views cont
 Usefulness:
• Makes the Drawing More Understandable,
Especially The Internal Details Of The Part
• Since The Sectioned Drawing Shows Internal
Features There Is Generally NO NEED To
Show HIDDEN Lines
• Especially helpful for
– Complex Part Fabrication
– Assembly Drawings
Engineering 22 – Engineering Design Graphics
5
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Some Assembly Drawings
Engineering 22 – Engineering Design Graphics
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Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

The Cutting Plane
 An imaginary plane that defines where the object is cut
 Shown in drawing
ADJACENT to the
Sectioned View
 Drawn with the PHANTOM or HIDDEN line type
 Arrows at the end of the cutting plane line indicate the direction of view for the sectioned drawing.
Engineering 22 – Engineering Design Graphics
7
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

The Cutting Plane cont.
 The arrows point
TOWARD the part of the object that is
VISIBLE in the sectioned view
 A sectioned drawing follows the general rules of any view in an
OrthoGraphic
MULTIVIEW drawing
Engineering 22 – Engineering Design Graphics
8
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Multiple Cutting Planes
 Cutting planes may be labeled at their endpoints if multiple cutting plane lines are used
 When using multiple cutting planes each sectioned drawing is drawn as if the other cutting plane lines do not exist
 The cutting plane line takes precedence over center lines
 Cutting planes may by omitted when their location is obvious
Engineering 22 – Engineering Design Graphics
9
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Section View Placement
 The Section View is Placed “Opposite” to the Direction of the Cutting Plane Arrows
• The Arrows are Rotated INTO the Paper to
Reveal the Section
Engineering 22 – Engineering Design Graphics
10
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Cross Hatch Lines
 Cross-Hatch Lines are drawn where the object passes through the cutting plane
 If a saw were used to cut the part then Hatch lines represent the cutting
(tool) marks left by the saw blade
 Different materials may be represented by the use of different
Hatch line types
• The general Hatch line type which may be used for any material is the line type for IRON
Engineering 22 – Engineering Design Graphics
11
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Hatch Line Conventions
 Hatch lines should NOT be PARALLEL or
PERPENDICULAR to object lines
 Hatch lines are generally drawn at 45 ° unless this conflicts with other rules
 Hatch lines should be oriented at different angles for separate parts
 Occasionally Hatch lines are only drawn on the perimeter of large areas (not an issue with CAD)
 Hatch lines are not used for thin parts rather they are filled in solid (Do not use closely spaced Hatch lines)
Engineering 22 – Engineering Design Graphics
12
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Section Line Conventions cont.
 Cutting Plane Lines Take
Precedence over Center
Lines
 Hatch Line Density
• Should Clearly Identify the
Cut Material
• Not be Too Dense As This
Tends to Obscure Object lines
Engineering 22 – Engineering Design Graphics
13
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Sketch Demo
 Using the White Board, Let’s
Make Some Cross Section
Drawings
A
B
Engineering 22 – Engineering Design Graphics
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C
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution
Engineering 22 – Engineering Design Graphics
15
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-B Solution
Engineering 22 – Engineering Design Graphics
16
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-C Solution
Engineering 22 – Engineering Design Graphics
17
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

All Done for Today
Blue Print
CrossSec
Circa 1862
Engineering 22 – Engineering Design Graphics
18
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt


2 x
3 
7 x
2  x

6 f
Bruce Mayer, PE
Licensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engineering 22 – Engineering Design Graphics
19
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution - 1
 Grid it
Engineering 22 – Engineering Design Graphics
20
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution - 2
 Connect
Dots to
Block In
OutLine
Engineering 22 – Engineering Design Graphics
21
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution - 3
 Connect
Dots to
Reveal
Sliced
Edges
Engineering 22 – Engineering Design Graphics
22
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution - 4
Engineering 22 – Engineering Design Graphics
23
 Construct
View of
Rounded-
End Slot
• Circle
• Trim
• Pedit (turn
½-circles into
Plines)
• Pline
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution - 5
 Connect the Dots to
Reveal
Sliced
Areas
 Hatch the
Sliced
Areas
Engineering 22 – Engineering Design Graphics
24
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-A Solution - 6
Engineering 22 – Engineering Design Graphics
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 Strip Out
Constr
Lines, and
Add Center
Marks &
Lines to
Show
Completed
Cross-
Section
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-B Solution
Engineering 22 – Engineering Design Graphics
26
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-B Solution
Engineering 22 – Engineering Design Graphics
27
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-C Solution
Engineering 22 – Engineering Design Graphics
28
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt

Prob-C Solution
Engineering 22 – Engineering Design Graphics
29
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt