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Reminder-Instructions for equipment

- Tutorial 4 onwards you will bring the following
- Approximately 21.5 x 15 in. drawing sheets
- Cello tape for fixing sheet to desk
- Compass (small and big)
- Divider
- Pencils (H and 2H)
- More Hlighter
- Mini drafter
- Metric scale and eraser

Mini Drafter (Tutorial 4 onwards)

A mini drafter is a portable device used to draw parallel, inclined and perpendicular lines speedily. It is mounted on a drawing board at the top left corner. A drafter consists of a scale, a scale screw, a scale plate, steel bars, a bar plate and a clamping mechanism

Plane of projection

e, h

a, e

a, d

d, h

h

e

d

a

b, c

f, g

c, g

b, f

f

g

c

b

Face abcd retains original shape and dimensions

Projection lines are oblique to the plane

Drawing an oblique projection

Axes are drawn such that two of them are perpendicular to each other for the front face (horizontal and vertical) and the third is drawn at a pre-defined angle (use 45o in this course) to horizontal axis

Lines drawn in true length

y

This face will have features with true shape

z

Receding line

a

Receding angle

x

o

ataken as 45o

Oblique view of a cuboid

Draw essential contours (circles, curves etc.) on this face

Oblique view

- It is a method of drawing a 3-D view of an object (similar to isometric view)
- 2 axes are mutually perpendicular while the 3rd. axis is at an angle (other than 90o to the other 2 axes)

Place complex features (arc, hole, irregular shape

surface parallel to frontal plane.

Cavalier and cabinet projection

- Two types of oblique projection
- Cavalier projection: When the receding lines are drawn to full size scale and the projectors are inclined at an angle of 30o, 45o, or 60o
- Cabinet projection: If the receding lines are drawn to half size scale.

We use Cavalier Projection in this course

- A plane is a two-dimensional geometrical entity
- It has length and width but no thickness
- For practical purposes, a flat face of an object may be treated as a plane
- A plane which has limited extent (has fixed shape) is termed as a lamina

- Information usually given:
- Shape of the plane
- Inclination of it’s surface with one of the reference (principal) planes
- Inclination of one of it’sedgeswith the otherreference plane will be given

For T.V.

For T.V.

For Fv

For F.V.

For F.V.

VP

VP

VP

c1’

d1’

c’

b’

b’

c’

a1’

d’

a’

B

A

C

b1’

d’

a’

d1

d1

a1

a

d

a1

b

c

b1

b1

c1

c1

HP

HP

HP

ONE SMALL SIDE INCLINED TO VP

PICTORIAL PRESENTATION

SURFACE INCLINEDTO HP

PICTORIAL PRESENTATION

SURFACE PARALLELTO HP

PICTORIAL PRESENTATION

FV-1

FV-2

FV-3

T V-1

T V-2

T V-3

ORTHOGRAPHIC

FV- Apparent Shape

TV-Previous Shape

ORTHOGRAPHIC

TV-True Shape

FV- Line // to xy

ORTHOGRAPHIC

FV- Inclined to XY

TV- Reduced Shape

Rectangle 30mm and 50mm sides is resting on HP on one small side which is 300 inclined to VP, while the surface of the plane makes 450 inclination with HP. Draw it’s projections.

Surface // to Hp

Surface inclined to Hp

c’1

d’1

c’

d’

c’

d’

b’

a’

a’

b’

b’1

a’1

450

Y

X

300

a

a1

a1

d1

d

Side

Inclined

to Vp

b1

c

d1

b

b1

c1

c1

Drawing the side view

w

w

T

O

w

F

45o

T

F

O

w

RSV

RSV

With O as center draw curves (1/4 circle) to project the corners

Draw a line from O at 45o to the horizontal axis to project the corners

Dimensional parameters of different solids.

Cone

Cylinder

Square Prism

Square Pyramid

Apex

Apex

Top

Slant

Edge

Rectangular

Face

Triangular

Face

Base

Base

Base

Longer

Edge

Base

Edge

of

Base

Corner of base

Edge

of

Base

Corner of base

Generators

Imaginary lines

generating curved surface

of cylinder & cone.

Frustum of cone & pyramids.

( top & base parallel to each other)

Sections of solids( top & base not parallel)

Resting on Hp on one generator, means lying on Hp:

1.Assume it standing on Hp.

2.It’s Tv will show True Shape of base( circle )

3.Draw 40mm dia. Circle as Tv &

taking 50 mm axis project Fv. ( a triangle)

4.Name all points as shown in illustration.

5.Draw 2nd Fv in lying position I.e.o’e’ on xy. And

project it’s Tv below xy.

6.Make visible lines dark and hidden dotted,

as per the procedure.

7.Then construct remaining inclination with Vp

( generator o1e1 300 to xy as shown) & project final Fv.

a’1

h’1

b’1

g’1

e’

a’

c’g’

d’f’

h’b’

f’1

c’1

o’

d’1

e’1

g1

g1

h1

f1

h1

f1

a1

e1

a1

b1

e1

b1

d1

d1

c1

c1

Problem:

A cone 40 mm diameter and 50 mm height

is resting on one generator on Hp

which makes 300 inclination with Vp

Draw it’s projections.

Draw in 1st.angle

o’

Y

o1

X

a’

h’

b’

c’

g’

f’

e’

d’

30

g

o1

h

f

a

o1

e

b

d

c

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