BMayer@ChabotCollege.edu ENGR-22_Lec-11_Section-Views-1.ppt 1 Bruce Mayer, PE Engineering 22 –...

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt1

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Bruce Mayer, PERegistered Electrical & Mechanical Engineer

BMayer@ChabotCollege.edu

Engineering 22

SectionSectionViews-1Views-1

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.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-11_Section-Views-1.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-11_Section-Views-1.ppt4

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Section ViewsSection Views Definition: An Orthographic Technical

Drawing That Reveals Details About INTERNAL Features By Displaying The Part As If Cut By An Imaginary Plane

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt5

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Section Views Section Views contcont

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

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt6

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Some Assembly DrawingsSome Assembly Drawings

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt7

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

The Cutting PlaneThe 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.

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt8

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

The Cutting Plane cont.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

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt9

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Multiple Cutting PlanesMultiple 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

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt10

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Section View PlacementSection 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

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt11

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Cross Hatch LinesCross 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

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt12

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Hatch Line ConventionsHatch 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)

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt13

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Section Line Conventions cont.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

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt14

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Sketch DemoSketch Demo Using the White Board, Let’s

Make Some Cross Section Drawings

A

B

C

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt15

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A SolutionProb-A Solution

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt16

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-B SolutionProb-B Solution

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt17

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-C SolutionProb-C Solution

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt18

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-11_Section-Views-1.ppt19

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-11_Section-Views-1.ppt20

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A Solution - 1 Prob-A Solution - 1 Grid it

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt21

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A Solution - 2 Prob-A Solution - 2 Connect

Dots to Block In OutLine

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt22

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A Solution - 3 Prob-A Solution - 3 Connect

Dots to Reveal Sliced Edges

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt23

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A Solution - 4 Prob-A Solution - 4 Construct

View of Rounded-End Slot• Circle

• Trim

• Pedit (turn ½-circles into Plines)

• Pline

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt24

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A Solution - 5 Prob-A Solution - 5 Connect

the Dots to Reveal Sliced Areas

Hatch the Sliced Areas

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt25

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-A Solution - 6 Prob-A Solution - 6 Strip Out

Constr Lines, and Add Center Marks & Lines to Show Completed Cross-Section

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt26

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-B SolutionProb-B Solution

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt27

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-B SolutionProb-B Solution

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt28

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-C SolutionProb-C Solution

BMayer@ChabotCollege.edu • ENGR-22_Lec-11_Section-Views-1.ppt29

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Prob-C SolutionProb-C Solution