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Section Plane

Through Apex

Section Plane

Through Generators

Section Plane Parallel

to end generator.

Section Plane

Parallel to Axis.

Triangle Ellipse

Hyperbola

Ellipse

Cylinder through

generators.

Sq. Pyramid through

all slant edges

Trapezium

Typical Section Planes

&

Typical Shapes

Of

Sections.

ILLUSTRATION SHOWING

IMPORTANT TERMS

IN SECTIONING.

x y

TRUE SHAPE

Of SECTION

SECTION

PLANE

SECTION LINES

(450 to XY)

Apparent Shape

of section

SECTIONAL T.V.

For TV

SECTIONING A SOLID.

An object ( here a solid ) is cut by

some imaginary cutting plane

to understand internal details of that object.

The action of cutting is called

SECTIONING a solid

&

The plane of cutting is called

SECTION PLANE.

OBSERVER

UPPER PART

REMOVED

(A)

HP

VP

Projection of the section plane on VP

S S

Section plane perpendicular to VP and Parallel to HP

VP

HP

Section plane perpendicular to VP and Parallel to HP

Top View in Section

HP

VP

Projection of the section plane on VP

Top View in Section

Section plane perpendicular to VP and Inclined to HP

VP

HP

Section plane perpendicular to VP and inclined to HP

HP

VP

Projection of the section plane on HP

Front View in Section

S S

Section plane perpendicular to HP and parallel to VP

VP

HP

Section plane perpendicular to HP and Parallel to VP

HP

VP

Projection of the section plane on HP

Front View in Section

Section plane perpendicular to HP and inclined to VP

VP

HP

Section plane perpendicular to HP and inclined to VP

HP

VP

Side View in Section

Section plane perpendicular to both HP and VP

VP

HP

Section plane perpendicular to both HP and VP

S S

S S

X Y

RPP

Section of Solids

• A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

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A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Draw XY Line, mark HP and VP.

X Y

VP

HP

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X Y

VP

HP

a

bco(o1)

c' b'a'

o'

(o1')

40

60

A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Draw Top view and Front View, Mark points

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X Y

VP

HP

a

bco(o1)

c' b'a'

o'

(o1')40

60

3

2

1

1'2'

3'

A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Show the Section plane, draw vertical projectors to the top view and obtain section pints in the top view.

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X Y

VP

HP

a

bc

o(o1)

c' b'a'

o'

(o1')

40

60

3

2

1

1'2'

3'

A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Show the sectional top view

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X Y

VP

HP

a

bc

o(o1)

c' b'a'

o'

(o1')

40

60

3

2

1

1'2'

3'

X1

X2

27,48

21,7

1

48,65

A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Show the Auxiliary inclined plane, parallel to section plane, draw perpendiculars from the section pints to the auxiliary inclined plane, measure the distances from XY line to section points in the top view

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X Y

VP

HP

a

bc

o(o1)

c' b'a'

o'

(o1')

40

60

3

2

1

1'2'

3'

X1

X2

27,48

21,7

1

48,6

5

1''

3''

2''

A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Reproduce the distances of the top view section points from XY line in to Auxiliary plane, mark points, 1’’, 2’’ and 3’’, join these three points.

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A triangular pyramid, base 40mm sides and axis 60mm long, resting on its base on the HP with one of its edges parallel to the VP. A section plane passing through one of the base corners of the pyramid and the two slant edges at 20mm and 30mm above HP cuts the pyramid. Draw the front view, sectional top view and true shape of the section. Determine the inclination of the section plane with the reference plane.

• Make visible edges, Retaining portion dark • Show the annotation. Show ans. if Any

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