Section Views-Engineering Drawing and Graphics-Lecture Slides, Slides of Engineering Drawing and Graphics

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Lecture 17

Section Views

TOPICS

Introduction

Terminology & common practices

Kind of sections

Dimensioning

Object

GRAPHICS COMMUNICATION

WITH ENGINEERING DRAWING

Working drawing

Clear?

Orthographic projection ( convention )

Section views convention

Section Views

Orthographic Projection

Finish

Yes

No

Dimensioning

PURPOSES OF

SECTION VIEWS

Clarify the views by

Facilitate the dimensioning.

 reducing or eliminating the hidden lines.

 revealing the cross sectional’s shape.

Let See the example

Terminology and

common practices

Cutting plane

CUTTING PLANE

Cutting plane line

Cutting plane is a plane that imaginarily cuts

the object to reveal the internal features.

Section lines

ANSI standard

Thick line

Thick line

JIS & ISO

standard

Thin line

CUTTING PLANE LINESTYLES

Viewing direction

Viewing direction

Viewing direction

Note: When a cutting-plane line coincides with a center line, the

cutting-plane line takes precedence.

CUTTING PLANE LINESTYLES

Section-Lining Technique

 Draw the section lines preferably at 45deg with the

horizontal

 Section line spacing can be from 1.5 mm (1/16”) to 3

mm (1/8”). For average drawing, spacing should be

about 2.5 mm (3/32”) or more apart.

SECTION LINES SYMBOLS

The section lines are different for each of

material’s type.

Cast iron, Malleable iron

Steel Concrete^ Sand^ Wood

For practical purpose, the cast iron symbol is

used most often for any materials.

SECTION LINING PRACTICE

It should not be drawn parallel or perpendicular to contour of the

view. If section lines drawn at 45 deg. with horizontal would be

parallel or perpendicular (or nearly so) to a prominent visible outline,

the angle should be changed to 30deg., 60deg., or some other angle.

COMMON MISTAKE

Kinds of Sections

FULL SECTION VIEW

The view is made by passing the straight cutting

plane completely through the part.

Full Section