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SECTIONING OF A MACHINE COMPONENT BY ANY ONE SECTION PLA NE ,OUT OF THREE FOLLOWING MENTIONED SECTION PLANES. BY A VERTICAL SECTION PLANE (PARALLEL TO PRINCIPLE V.P.) Hence , The real or true shape of the section is observed in its F.V., known as SEC. F.V. - AB

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slide1

SECTIONING OF A MACHINE COMPONENT BY ANY ONE SECTION PLA NE ,OUT OF THREE FOLLOWING MENTIONED SECTION PLANES

slide2

BY A VERTICAL SECTION PLANE

  • (PARALLEL TO PRINCIPLE V.P.)
  • Hence ,
  • The real or true shape of the section is observed in its F.V., known as SEC. F.V. - AB
  • Section plane will be seen as a cutting plane line (similar to center line ,thick at ends) with corresponding horizontal vision direction arrows at the center of thick ends in its T.V. & S.V.
slide3

(2)BY A HORIZONTAL SECTION PLANE

  • Hence,
  • The real or true shape of the section is observed in
  • its T.V., known as SEC. T.V. - AB
  • (b) The cutting or section plane will be observed as a
  • cutting plane line (similar to center line ,thick at
  • ends) with the corresponding vertically downward
  • vision direction arrows at the center of the thick
  • ends in its F.V. and in S.V.
slide4

(3) BY A SECTION PLANE , NORMAL TO

BOTH H.P. AND V.P.

(i.e. parallel to profile plane or side view plane)

Hence,

(a)The real or true shape of the section is observed in its S.V., known as SEC. L.H.S.V – AB or SEC. R.H.S.V - AB

(b) The cutting or section plane will be observed as a cutting plane line (similar to center line , thick at ends) with the corresponding vertically downward vision direction arrows at the center of the thick ends in its F.V. and in T.V.

slide5

Figure shows isometric view of a machine component. Draw its

  • Front view, Top view & L.H.S View, using 3rd angle method of projections.
  • Sectional Front view, Top view & L.H.S.V., using 3rd angle method of projections.

60

B

40

30

15

10

30

50

15

5

R12.5

15

50

30

X

A

50

slide6

Ortho. Views (No sectioning)

10

1.

30

60

30

40

15

25

5

50

50

X

Top View

50

15

L.H.S.View

Front View

slide7

B

X

A

B

It will be nearer to V.P. in 1st angle method & against the vertical plane in 3rd angle method.

X

Retained split of the machine parts

A

slide8

(With sectioning)

10

A

B

30

60

30

40

15

25

5

50

50

2.

A

B

Top View

A

B

Sectional Front View -AB

L.H.S. View

slide9

Figure shows the pictorial view of a machine component. Draw its following views as per First angle method of projections

28

A

(1) Front view from X direction.

(2) Sectional top view-AA

Ø20

Ø30

(3) L.H.S. View

60

A

20

7

14

120

20

28

X

slide10

Sketch shows the assumed cut model (retained part of the machine component / split against the observer) due to horizontal section plane passing through AB.

120

20

X

28

slide11

Ø20

Ø30, 7deep

20

A

A

A

A

60

20

120

L.H.S.V.

F.V.

28

14

Sectional T.V.

slide12

Figure shows the pictorial view of a machine components. Draw its following views, using 3rd angle method of projections.

  • Front view from arrow X
  • Top View
  • Sectional R.H.S.V - AB

30

10

B

60

20

40

R10

20

90

60

A

X

slide13

Retained split, will be nearer to V.P. in 1st angle method & against the vertical plane in 3rd angle method.

B

No hatching in this area as not contained in the section plane

Retained split of the machine parts

A

slide14

A

30

60

90

20

20

40

T.V.

A

80

SEC.

R.H.S.V

20

F.V.

A

slide15

SPECIAL

SECIONS

HALF SECTION

slide16

HALF SECTIONAL F.V.-AB

HALF SECTIONAL

LEFT S.V.-BC

In half section the hidden line should be used only on

unsectioned side of the view, provided that they are necessary for dimensioning or for clarity.

B

A

C

TOP VIEW

slide17

SPECIAL SECTIONS

REMOVED & REVOLVED SECTIONS

slide18

REMOVED

SECTION

REVOLVED

SECTION

REMOVEDSECTION

slide22

NOTE:- (As per Previous I S 696 – 1972 Page 38)

When the cutting plane passes (contains) the center line of such elements as,

Shafts,bolts,nuts,rods,rivets,keys,pins, pulley arms, spokes, webs(ribs),screws,ball or roller bearings or similar shapes - no section lining or sectioning is needed for the objects , i.e. the hatching should be eliminated.

(See the next demonstrating exercises following the above rule)

slide23

Vertical Collared Shaft (supported on webbed and drilled flange) in Conventional section in F.V., along with

the T.V.

Note:- As a rule, all the hidden lines should be omitted from a sectional view. The only exemption is where the hidden lines are absolutely Indispensable for clarification or for dimensioning.

Actual or true projections are not preferred to draw

slide24

OFFSET SECTION:The path of the cutting plane is bent to pass through features not located in a straight line, i.e. it is offset to pass through both principle features of the object. Example is shown below in Ex. 1 & Ex. 2.

R

Section lines are to be staggered as shown at R

B

Ex. 1.

B

slide25

P

Q

F.V (SECTION –AA)

Off set sectioning

Ex. 2.

A

A

Section lines are to be staggered as shown at P,Q

slide26

Tap bolt(fastener)

Partial (broken, local or Zonal) Section.

pulley

shaft

See Ex. A,B & C

Ex. A

Shaft and pulley partly broken out to show internal fastening

This is used to show only a desired features of the object . No cutting plane lines are necessary , shown by wavy line

slide28

SPECIAL SECTION

A

B

SECTION IN TWO INTERSECTING PLANES

SEC. F.V. - AB

R.H.S.V.

slide29

SPECIAL SECTION

Cross hatching of adjacent parts See at (1) & (2)

(1)

slide30

SPECIAL SECTION

Hatching more than two adjacent components

at (2)

C

(hatched

at 60 )

45

B

A

hatched

at 30

on D

(2)

D

45

slide31

A

B

F.V.

SEC.T.V.

Two vertical plates ,fastened by a horizontal

rivet is shown in its F.V. & T.V., cut by horizontal

section plane. Note the rivet is shown in section in

T.V.

slide32

CONVENTIONAL REPRESENTATION

OF CYLINDER IN WHICH

CIRCULAR OR RECTANGULAR

HOLE CUT IN ITS F.V.

Note:- The actual shape of hole

or slot may be understood from

its side view.

For circular hole

ACTUAL

PROJECTIONS

For rectangular slot

slide33

AUXILARY SECTION

A

A

SECTIONAA

slide34

AUXILIARY SECTION (as special

section)

It is the sectional view not in principal planes. it may be full, half ,broken out , removed or revolved.The section should be shown in its normal auxilary position and clearly identified with a cutting plane with letters

slide35

SUCCESSIVE SECTIONS (REMOVED TYPE)

B

C

D

A

A

D

C

B

SECTION

AA

SECTION

BB

SECTION

DD

SECTION

CC

slide37

SECTION

AA

SECTION

DD

SECTION

CC

SECTION

BB

SUCCESSIVE SECTIONS (REMOVED TYPE)

slide40

(With sectioning)

A

B

A

B

2.

A

B

Top View

Sectional Front View -AB

L.H.S. View

slide41

70

13

7

15

Ø30,2 HOLES

26

7

15

15

30

26

Ø30

45

R20

slide42

13

Ø30,2 HOLES

slide43

15

70

7

12

26

13

10

15

15

30

81

26

ø30

R20

L.H.S.V.

SCECTIONAL F.V.-AA

0

70

10

65

TOP VIEW

slide44

SOLUTION`

14

70

14

8

A

A

A

30

14

R35

8

Approx.25

A

Φ20

8

R35

30

Φ36

Φ20

Φ36

14

2 HOLES,Φ 14

100

65

14

34

65

14`

14

A

14

100

70

100

A

X

Aim:-Sketch-1, shows Isometric View of a machine part. Draw its following orthographic views using third angle method of projections, giving dimensions.

(1) Sectional F.V.-AA

(2) T.V.

(3) L.H.S.V

TOP VIEW

SECTIONAL FRONT VIEW AA

LEFT HAND SIDE VIEW

Sketch-1

SCALE:- 1:1

SYMBOL OF PROJECTION METHOD, NOT SHOWN

slide45

SOLUTION`

14

70

14

8

A

A

A

14

R35

Approx.25

A

14

Φ20

8

R35

Φ36

Φ20

Φ36

2 HOLES,Φ 14

100

34

65

A

14

100

A

X

Aim:-Sketch-1, shows Isometric View of a machine part. Draw its following orthographic views using third angle method of projections, giving dimensions.

(1) Sectional F.V.-AA

(2) T.V.

(3) L.H.S.V

30

TOP VIEW

SECTIONAL FRONT VIEW AA

LEFT HAND SIDE VIEW

Hatch (section) lines, to be kept at 1 to 1.5 mm apart, at 45° normally, but depends on areas to be hatched.

SCALE:- 1:1

SYMBOL OF PROJECTION METHOD, NOT SHOWN

slide46

60

40,DEPTH 24

50

30

14

70

10

48

14

slide48

Ø40

Ø64

24

50

30

10

140

14

48

14

70

TOP VIEW

L.H.S.V

FRONT VIEW