Understanding Section Views in Technical Drawing: Creating and Interpreting Cutting Planes, Slides of Computer-Aided Design for Engineers

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Section

Views-

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

Section Views

• Definition: An Orthographic Technical

Drawing That Reveals Details About

INTERNAL Features By Displaying The Part

As If Cut By An Imaginary Plane

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

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.

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

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

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

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

Sketch Demo

• Using the White Board, Let’s

Make Some Cross Section

Drawings

A

B

C

Prob-B Solution

Prob-C Solution

Bruce Mayer, PE Licensed Electrical & Mechanical Engineer [email protected]

Engr/Math/Physics 25

Appendix

f ( ) x = 2 x^3 − 7 x^2 + 9 x − 6

Prob-A Solution - 1

 Grid it