Lec 2. isometric view (lect) mee 218
-
Upload
30gm-unilorin -
Category
Documents
-
view
97 -
download
2
description
Transcript of Lec 2. isometric view (lect) mee 218
![Page 1: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/1.jpg)
Pictorial Drawing/Sketching
![Page 2: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/2.jpg)
Objectivesis to be able:
to explain the difference between
axonometric projection and oblique
projection.
to explain the difference between
isometric projection and isometric
drawing/sketch.
to create isometric and oblique
sketches from the actual object and multiview
drawing.
![Page 3: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/3.jpg)
Axonometric & Oblique
Projection
![Page 4: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/4.jpg)
Axonometric Projection
AB
CD
Parallel & normal
to picture plane
Line
of
sightA
B
CD
![Page 5: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/5.jpg)
Axonometric Projection
Type of axonometric drawing
a
b c2. Dimetric Two angles are equal.
b
a
c3. Trimetric None of angles are
equal.
a
b c1. Isometric All angles are equal.
AB
CDA
B
C
D
Axonometric axis
Axonometric axis
Axonometric axis
![Page 6: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/6.jpg)
A
BC
D
Line
of
sight
Parallel & oblique
to picture plane
Oblique Projection
A
D
C
B
![Page 7: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/7.jpg)
Oblique Projection
A
D
C
B
B
C D
A
Oblique drawing angle
30o45o 60o
Type of Oblique drawing
45o 45o
1) Cavalier 2) Cabinet
Fullscale Half
scale
![Page 8: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/8.jpg)
Isometric Projection/Drawing
![Page 9: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/9.jpg)
Rotate 45
about vertical axis
Tilt forward (35o16’)
Isometric Projection
All edges foreshortenabout 0.8 time.
![Page 10: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/10.jpg)
Isometric Drawing
Isometric drawing is a drawing drawn on an isometric
axes using full scale.
Isometric projection(True projection)
Isometric drawing(Full scale)
Forshorten
Full scale
![Page 11: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/11.jpg)
Positions of Isometric Axes
Isometric axes can be arbitrarily positioned to create
different views of a single object.
Regular
isometricReverse axis
isometric
Long axis
isometric
View point is looking
down on the top of
the object.
View point is looking
up on the bottom of
the object.
View point is looking
from the right (or left)
of the object.
![Page 12: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/12.jpg)
Distance in Isometric Drawing
Isometric line is the line that run parallel to
any of the isometric axes.
Isometric axes
True-length distances are shown along
isometric lines.
Nonisometric lines
![Page 13: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/13.jpg)
Isometric Drawing/Sketching
Methods/Steps
![Page 14: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/14.jpg)
2. Define an isometric axis.
3. Sketching the enclosing box.
4. Estimate the size and relationship of each
details.
5. Darken all visible lines.
1. Place the object in the position which its shape
and features are clearly seen.
Sketch from the actual object
![Page 15: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/15.jpg)
STEPS
1. Positioning object.
2. Select isometric axis.
3. Sketch enclosing box.
4. Add details.
5. Darken visible lines.
Sketch from the actual object
![Page 16: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/16.jpg)
1. Positioning object.
2. Select isometric axis.
3. Sketch enclosing
box.
4. Add details.
Note In isometric sketch/drawing), hidden lines are omitted
unless they are absolutely necessary to completely
describe the object.
Sketch from the actual objectSTEPS
5. Darken visible lines.
![Page 17: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/17.jpg)
CAN YOU TRY ONE ???
![Page 18: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/18.jpg)
1. Interprete the meaning of lines/areas in
multiview drawing.
2. Locate the lines or surfaces relative to isometric
axis.
Sketch from multiview drawing
![Page 19: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/19.jpg)
Front View
Top View
Side View
Class work 1: Object has only normal surfaces
Bottom View
Bottom
FrontSide
SideFront
Top
Regular
Reverse
WD
H
H
DW
![Page 20: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/20.jpg)
Class work 2: Object has inclined surfaces
W
HD
y
x Front View
y
x
Nonisometric line
![Page 21: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/21.jpg)
Nonisometric line
A
A x
y
x
xB
B
AB
C
C
C
x
y
Class work 3: Object has inclined surfaces
![Page 22: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/22.jpg)
A
A
B
B
C D
E
D
EF
F
x
y
Front View
Regular
C
Class work 4
Reverse
![Page 23: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/23.jpg)
Circle & Arc in IsometricIn isometric drawing, a circle appears as an ellipse.
2. Construct an isometric square.
3. Sketch arcs that connect the
tangent points.
Sketching Steps
1. Locate the centre of an ellipse.
![Page 24: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/24.jpg)
Circle & Arc in Isometric
3. Construct a perpendicular
bisector from each tangent point.
4. Locate the four centres.
5. Draw the arcs with these centres
and tangent to isometric square.
Sketching Steps
Four-centre method is usually used when drawn an
isometric ellipse with drawing instrument.
2. Construct an isometric square.
1. Locate the centre of an ellipse.
![Page 25: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/25.jpg)
Class work 5
![Page 26: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/26.jpg)
Irregular Curve in Isometric
1. Construct points along the
curve in multiview drawing.
2. Locate these points in the
isometric view.
3. Sketch the connecting lines.
Steps
![Page 27: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/27.jpg)
Oblique
Sketching
![Page 28: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/28.jpg)
Object Orientation Guidelines
Place complex features (arc, hole, irregular shape
surface parallel to frontal plane.
![Page 29: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/29.jpg)
Object Orientation GuidelinesThe longest dimension of an object should be
parallel to the frontal plane.
GOOD
BAD
GOOD
BAD
![Page 30: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/30.jpg)
Object Orientation Guidelines
Which orientation is better ?
![Page 31: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/31.jpg)
D
45
ESTIMATE DEPTHESTIMATE LINES
Sketch from the actual object
![Page 32: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/32.jpg)
Sketch from multiview drawing
![Page 33: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/33.jpg)
Sketch from multiview drawing
![Page 34: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/34.jpg)
AB
C
D
E
Sketch from multiview drawing
![Page 35: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/35.jpg)
AB
C
D
E
Sketch from multiview drawing
![Page 36: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/36.jpg)
AB
D
E
C
Sketch from multiview drawing
![Page 37: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/37.jpg)
AB
D
E
C
Sketch from multiview drawing
![Page 38: Lec 2. isometric view (lect) mee 218](https://reader034.fdocuments.us/reader034/viewer/2022052504/549d2b08ac7959ec2a8b48bc/html5/thumbnails/38.jpg)
THANK YOU