A Definitive Resource for Multiview Drawings

8/17/2019 A Definitive Resource for Multiview Drawings

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Multiview Drawings

Definitive Resource


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Classical Engineering Drawing

Multiview Drawings

Multiview Drawing:

a collection of 2-

dimensional drawings

(of the same 3Dobject) that are

projected

orthogonally


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Multiview Drawings

What is meant by ‘orthogonal'?

the plane of projection is parallel to the view of

the object

straight,

right, or

proper


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Classical Engineering DrawingMultiview Drawing

Some plane

features are

showing up as a

line.


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Classical Engineering DrawingMultiview Drawing

Not all features displayed as ‘true’

i.e., the true shape ofthe face is not

displayed in this

auxiliary view


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Multiview DrawingPrincipal Drawing Views

six planes of projection form an imaginary box

around the object


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Multiview DrawingPrincipal Drawing Views

to make sense, the same scale is employed in all the views,

and the edges of the objects must line up


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Multiview DrawingProjection Systems

Third Angle Projection

• in the U.S., we unfold

the views around theobject like a box.

and it’s called a third-angle projection


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First Angle Projection

• in other countries the

views are projectedbehind the object

and it’s called a first-angle projection


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Third Angle Projection First Angle Projection


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Multiview Drawing

Projection Systems

You might see these symbols in a title box.


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Projection Systems

POP QUIZ

Which one of these systems are you likely to see?


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Projection Systems

POP QUIZ

Which one of these systems are you likely to see?


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Multiview DrawingAuxiliary and Section Views

For some shapes, the principal views are not

adequate to fully describe part shape(s). Thus

Auxiliary and Detail views are needed.


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section view(s), removed


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section view(s), removed


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Broken Views


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Broken-out, section view, revolved


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section view, offset cutting plane


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section view, offset


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section view(s), full


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section view, detail view


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section view, aligned


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section view, full

Revolution


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section view revolved, 3D


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section view, broken, revolved, chisel


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section view, half


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section view, Broken-out


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section view, full


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section view, revolved, broken


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section view, revolved


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Multiview Drawing

POP QUIZ

Name 5 types of views:• Primary, Secondary

• Auxiliary

• Partial views

•Assembly views

• Section views

• full section

• half section

• offset section

•

revolved• removed

• broken-out

• detail view


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Examples of Derived Drawing ViewsSolidWorks Help


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Classical Engineering DrawingView Notation Symbols


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Classical Engineering DrawingView Notation Symbols


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Classical Engineering DrawingDimensioning Rules

• placement:

– dimensions should not

be repeated nor should

unnecessary information

be given


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• placement:

– dimensions should

extend from the most

descriptive view

– dimensions which apply

to two views should be

placed between those

two views


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• placement:

– do not over-constrain;

one dimension is

omitted from a series of

dimensions since the

overall dimension

determines the omitted

dimension

– it is permissible to showthe omitted dimension

as reference

REF


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• placement:

– wherever possible,

dimensions should be

applied to visible lines,

rather than hidden lines .5


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• placement:

In order to dimension

each measurement in

its most descriptive

view, you may have to

place measurements in

more than one view


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• placement:

– crowded numerals

should be staggered for

better spacing


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• placement:

– where practical, place all

the dimensions on the

same side of the drawing

for ease of reading

– intermediate dimensions

should be placed in a

single line rather than

offset


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• placement:

– wherever possible,

dimension lines should

be placed outside of the

object, not within it

l l


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• placement:

– a dimension line should

not be used as an

extension line

.5

.45

Cl i l E i i D i


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Dimensioning Rules

• placement:

– avoid placing dimension

lines inside an angular

feature - allow for

extension lines

– ensure a gap between

extension lines and the

view/feature

Cl i l E i i D i


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Dimensioning Rules

• placement:

– extension lines may

cross, but dimension

lines should not

– extension lines show no

gap at points of crossing

– a witness line is used to

show that two

planes/features are

aligned

dimension line

d i m e n s i o n l i n e

extension

line(s)

⃝ ⃝ no gap

Cl i l E i i D i


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Dimensioning Rules

• Order of CoincidingLines:

– invisible lines begin witha dash, not a space

– dashes intersect without

a gap between them

– three dashes meet atthe intersection point

– as a continuation of avisible line, begin with a

space – invisible arcs begin with

a dash, etc

Cl i l E i i D i


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Dimensioning Rules

• Order of Coinciding

Lines (cont.):

– axis line starts and

ends with a longer

dash

– two axes intersect

with longer dashes

– axis extends the

boundary with a

longer dash

I might take

exception to this:

Cl i l E i i D i


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Some Drawing Abbreviations

Cl i l E i i D i


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Some Drawing Abbreviations


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Multiview Drawings

Definitive Resource

Date post:	06-Jul-2018
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A Definitive Resource for Multiview Drawings

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