LOS for
Download
1 / 29

Auxiliary views - PowerPoint PPT Presentation


  • 102 Views
  • Uploaded on

LOS for T.V. LOS for F.V. Auxiliary views. (Straight Edges). Line of sight (LOS) is an imaginary line from the eye to the object. To see the true shape of a surface, LOS must be perpendicular to that surface. LOS (T.V.). 1. 2. A. 4. 8. 3. 5. 7. 6. Take an object as follows :.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Auxiliary views ' - nhung


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

LOS for

T.V.

LOS for

F.V.

Auxiliary views

(Straight Edges)

  • Line of sight (LOS) is an imaginary line from the eye to the object.

  • To see the true shape of a surface,

    LOS must be perpendicular to that surface.


LOS (T.V.)

1

2

A

4

8

3

5

7

6

  • Take an object as follows :

LOS (L.S.V.)

LOS (F.V.)


2,7

1,8

A

3,6

4,5

T.V.

2,1

1

2

A

A

4,3

3

4

7,8

5,8

6,7

6,5

F.V.

L.S.V.

  • The Front, Top and Side Views are called the

    Principal Views. (Orthographic Projection)

  • Auxiliary View (or Extra View) is any view which is not one of the principal views.

  • Auxiliary view can be drawn from other views.

  • If you want to draw the true shape of surface A ( an auxiliary view of surface A) .

    need to choose LOS that is perpendicular to surface A.

LOS

for Aux. V.

of surface A


1

2

2,1

1

2

A

A

A

4,3

3

4

4

7,8

8

5,8

6,7

6,5

F.V.

L.S.V.

(View 2)

(View 1)

3

5

7

6

  • Procedure to draw auxiliary view from 2 given views:

1- Label all corners for the two given views.

2- Draw projection lines between the two given views.

3- Choose LOS for the Auxiliary view (from view 1)


1

LOS

for Aux. V.

of surface A

LOS

2

A

4

8

3

5

7

6


LOS

for Aux. V.

of surface A

1

LOS

2

x

A

4

8

3

5

7

x

6


RL1

2,1

1

2

LOS

A

43

3

4

7,8

5,8

6,7

6,5

F.V.

L.S.V.

RL2

(View 2)

(View 1)

4 - Draw a reference line RL1 perpendicular to LOS (OFFSET and Extend))

5 - Draw a second reference line RL2 perpendicular to the projection lines

between the two views (choose it close to view) (OFFSET and Extend)


2,1

1

2

LOS

A

43

3

4

7,8

5,8

6,7

6,5

F.V.

L.S.V.

(View 2)

(View 1)

RL1

RL2

6 - Draw projection lines // LOS from Each Corner to the reference line RL1 using SNAP TO perpendicular


d1

d2

1

2

A

3

4

1

d1

d2

8

2

4

RL1

5

7

3

2,1

LOS

6

4,3

7,8

5,8

6,7

6,5

F.V.

L.S.V.

RL2

(View 2)

(View 1)

7 - From Toolbars add Inquiry then use DISTANCE to measure from view 2

(example d1, d2 )

8 - Transfer these distance using OFFSET // RL1 for each corner

9- Extend the projection lines to the offset lines


1

d1

d2

8

2

4

RL1

d1

5

d2

7

3

2,1

1

2

LOS

6

A

4,3

3

4

7,8

5,8

6,7

6,5

F.V.

L.S.V.

RL2

(View 2)

(View 1)

9 - Label corners on transfer points.


LOS

for Aux. V.

of surface A

1

LOS

2

x

A

4

8

3

5

7

x

6


1

2

d1

d2

1

A

2

4

A

8

3

4

3

5

7

6

1

d1

d2

8

2

4

RL1

5

7

3

2,1

LOS

6

4,3

7,8

5,8

6,7

6,5

F.V.

L.S.V.

RL2

(View 2)

(View 1)

10- Join all points to auxiliary view. To ensure that no edges have been missed,

count the number of surfaces; loop each surface in turn, checking that all

points are connected. Use solid lines to showing lines and dashed lines for

hidden lines.


1

2

A

4

8

3

5

7

6

1

8

2

4

RL1

5

7

Complete Auxiliary View

showing the true shape

of Surface A

3

2,1

1

LOS

to A

2

6

A

A

4,3

3

4

7,8

5,8

6,7

6,5

F.V.

L.S.V.

RL2

(View 2)

(View 1)

  • To draw the True shape of surface A, choose LOS which is perpendicular A.

    and repeat steps 1-10. (you will get an auxiliary view of the true shape of

    surface A).


In the previous examples, we have drawn complete auxiliary

views of the object.

  • Some times it is not necessary to draw complete auxiliary view, but only

  • an auxiliary view of only one surface in order to find its true shape.

  • This auxiliary view which shows only part of the object and not

  • the whole object is called “Partial Auxiliary View”.


1

2

3

RL1

Partial Auxiliary View

showing the true shape

of Surface A

4

2,1

1

LOS

to Surface

A

2

A

A

4,3

4

3

7,8

5,8

6,7

6,5

F.V.

L.S.V.

RL2

(View 2)

(View 1)

  • Example : draw the true shape of surface A as partial auxiliary view: repeat

    steps 1-10 but only for the corners of surface A (corners 1,2,3 and 4).


Surface A

LOS

E

Auxiliary Views (Curved Edges)

The same procedure (steps1-10) discussed before applies for curved edges.

However, curved edges have no corners, so we take points on the curved edges

and treat them like corners. The more points we take, the better the drawing of the

Curved edges.

Take the following examples.

Surface A

Draw a true shape of surface A ( i .e we need an auxiliary view where LOS is Perpendicular to surface A.


6'

5'

7'

8'

4'

9'

3'

10'

2'

11

+

1

2

10

3

9

4

8

5

7

6

1

2

3

4

5

6

7

8

9

10

11

1

- choose points on curved edges

  • connect projection lines between views

  • -Choose LOS ( in this case LOS is perpendicular to surface A to get true shape)


7'

6'

5'

8'

4'

3

9'

3'

10'

2'

- Draw RL1 perpendicular to projection lines // LOS

11

+

1

  • Draw RL2 perpendicular to projection lines

  • between the two views.

2

10

3

9

4

8

5

7

6

RL2

1

2

3

4

5

6

7

8

RL1

9

10

11


7'

6'

8'

5'

4'

9'

3'

10'

2'

11

+

1

2

10

3

9

4

8

5

7

6

1

2

3

4

5

6

7

8

9

10

11

2

  • Draw projection lines from chosen points

  • on curved edges parallel to LOS.


7'

6'

5'

8'

4'

9'

3'

10'

2'

11

+

1

2’

1

3’

4’

5’

2

10

6’

3

9

4

2

8

7’

5

7

6

RL2

8’

3

9’

4

5

10’

6

7

8

11

1

9

2

10

3

4

5

6

7

8

RL1

9

10

11

4

- Measure distance from RL2

- Transfer distance to RL1


7'

6'

5'

8'

4'

9'

3'

10'

2'

11

+

1

2’

1

3’

4’

5’

2

6’

10

3

9

4

7’

8

5

2

7

6

RL2

8’

3

9’

4

10’

5

6

7

8

11

1

9

10

2

3

4

5

6

7

8

RL1

9

10

11

5

- Connect points


6'

7'

8'

5'

4'

9'

3'

10'

2'

1

+

11

RL2

2

10

3

9

4

8

5

7

6

1

2

3

RL1

4

5

6

7

8

9

10

11

OR

3'

- Draw RL1

  • Draw RL1


6'

7'

5'

8'

4'

9'

3'

10'

2'

1

+

11

RL2

2’

3’

1

4’

2

10

5’

3

9

4

6’

8

5

7

6

2

7’

8’

3

9’

4

5

10’

6

7

1

2

11

8

9

3

RL1

10

4

5

6

7

8

9

10

11

OR

4'

- Measure distance from RL2

  • Transfer distance to RL1


6'

7'

5'

8'

4'

9'

3'

10'

2'

+

1

11

RL2

2’

3’

1

4’

2

10

5’

3

9

4

6’

8

5

7

6

7’

2

8’

3

9’

4

10’

5

6

7

1

2

11

8

9

3

RL1

10

4

5

6

7

8

9

10

11

OR

5'

  • Connect Point


6'

7'

5'

8'

4'

9'

3'

10'

2'

+

1

11

RL2

2’

3’

1

4’

2

10

5’

3

9

4

6’

8

5

7

6

7’

2

8’

3

9’

4

10’

5

6

7

1

2

11

8

9

3

RL1

10

4

5

6

7

8

9

10

11

OR

5'

  • Connect Point


Summary of Auxiliary View

http://faculty.kfupm.edu.sa/CE/ahmadi/

Run //CE-WSINST

Identify line of sight

Create layers (1)  Choose color for projection.

Create layers (2)  Choose another color for point numbers.

- Draw offset  Through (any distance) and choose point for RL 2 & RL 1

Project lines from each view


- Choose layer for text  Give the Same Number on all layer

- Go to Tool pull down  drafting setting  object snap  perpendicular

- OR ONSAP  setting  perpendicular (SELECT)

- Go to Construction layer (1)

- Type DI (distance) or from the Tool bar add Inquiry bar & choose DI


- Go perpendicular  Go offset same dist. up and draw

- Extent line to new point  Give a point number as text.

- For curved line choose PL commands to draw lines

- Type PEDIT  Choose line (to show it smooth curve)  F

- To change some lines to hidden .

Modify  properties  Line type  hidden

- Mirror

Choose line  shift choose ….. specify 1st point

2nd point around the x-x line Enter



ad