Transcript Removed and Revolved Sections

SECTIONING OF A
MACHINE COMPONENT
BY ANY ONE SECTION
PLA NE ,OUT OF THREE
FOLLOWING MENTIONED
SECTION PLANES
(1)BY A VERTICAL SECTION PLANE
(PARALLEL TO PRINCIPLE V.P.)
Hence ,
(a)The real or true shape of the section is
observed in its F.V., known as SEC. F.V. - AB
(b)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.
(2)BY A HORIZONTAL SECTION PLANE
Hence,
(a)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.
(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.
15
(2)Sectional Front view, Top
view & L.H.S.V., using 3rd
angle
method
of
projections.
50
(1)Front view, Top view &
L.H.S View, using 3rd angle
method of projections.
15
Figure shows isometric view
of a machine component.
Draw its
Ortho. Views (No sectioning)
10
1.
40
60
25
15
30
30
5
50
50
15
50
Top View
L.H.S.View
Front View
B
It will be nearer to
V.P. in 1st angle
method & against the
vertical plane in 3rd
angle method.
A
Retained split of the
machine parts
10
(With sectioning)
2.
40
60
15
25
5
A
50
A
30
30
B
50
Top View
B
L.H.S. View
Sectional Front View -AB
Figure shows the pictorial view of a
machine component. Draw its
following views as per First angle
method of projections
A
(1) Front view from X direction.
20
20
A
60
(2) Sectional top view-AA
(3) L.H.S. View
X
20
Sketch shows the assumed cut model (retained part of
the machine component / split against the observer) due
to horizontal section plane passing through AB.
X
A
A
A
20
60
A
20
Ø20
Ø30, 7deep
14
28
120
F.V.
Sectional T.V.
L.H.S.V.
20
A
X
B
60
Figure shows the pictorial 30
view
of
a
machine
components.
Draw
its
following views, using 3rd
angle
method
of
projections.
(1) Front view from arrow X
(2) Top View
(3) Sectional R.H.S.V - AB
Retained split, will be
nearer to V.P. in 1st
angle
method
&
against the vertical
plane in 3rd angle
method.
A
B
No hatching in
this area as not
contained in the
section plane
Retained split of the
machine parts
A
40
T.V.
20 20
90
60
F.V.
20
80
A
A
SEC.
R.H.S.V
SPECIAL
SECIONS
HALF SECTION
HALF SECTIONAL F.V.-AB
B
A
C
TOP VIEW
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.
SPECIAL SECTIONS
REMOVED & REVOLVED
SECTIONS
REVOLVED
SECTION
REMOVEDSECTION
REMOVED
SECTION
REVOLVED SECTION
REMOVED SECTION
REMOVED SECTIONS
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
following the above rule)
exercises
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
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.
Section lines are
to be staggered as
shown at R
Ex. 1.
R
B
B
P
Q
F.V (SECTION –AA)
Off set
sectioning
Ex. 2.
A
A
Section lines are to be staggered as shown at P,Q
Partial (broken,
local or Zonal)
Section.
Tap bolt(fastener)
pulley
shaft
See Ex.
A,B & C
Shaft and pulley partly broken out to
show internal fastening
Ex. A
This is used to show only a desired features of the object .
No cutting plane lines are necessary , shown by wavy line
Partial (broken,
local or Zonal)
Section.
Ex. B
SPECIAL SECTION
SECTION IN TWO INTERSECTING PLANES
A
B
R.H.S.V.
SEC. F.V. - AB
SPECIAL SECTION
Cross hatching of adjacent parts See at (1) & (2)
(1)
SPECIAL SECTION
Hatching more than two adjacent components
at (2)
C
(hatched
at 60 )
45
B
A
45
(2)
D
hatched
at 30
on D
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.
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
AUXILARY SECTION
SECTION AA
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
SUCCESSIVE SECTIONS (REMOVED
TYPE)
B
A
C
D
C
D
A
B
SECTION
AA
SECTION
SECTION
BB
DD
SECTION
SUCCESSIVE SECTIONS (REMOVED
TYPE)
B
A
A
B
C
D
C
D
SUCCESSIVE SECTIONS (REMOVED
TYPE)
SECTION
AA
SECTION
SECTION
SECTION
BB
CC
DD
(With sectioning)
2.
A
B
A
Top View
B
L.H.S. View
Sectional Front View -AB
0
Aim:-Sketch-1, shows Isometric View of a
machine part. Draw its following
orthographic views using third angle
method
of
projections,
giving
dimensions.
SOLUTION`
(1) Sectional F.V.-AA
(2) T.V.
A
A
30
(3) L.H.S.V
R35
A
TOP VIEW
A
Φ20
8
Φ36
Φ20
14`
65
2 HOLES,Φ 14
100
Φ36
X
A
Sketch-1
A
LEFT HAND SIDE VIEW
SECTIONAL FRONT VIEW AA
SCALE:- 1:1
SYMBOL OF PROJECTION METHOD, NOT SHOWN
Aim:-Sketch-1, shows Isometric View of a
machine part. Draw its following
orthographic views using third angle
method of projections, giving dimensions.
SOLUTION`
(1) Sectional F.V.-AA
(2) T.V.
(3) L.H.S.V
A
A
30
R35
A
TOP VIEW
A
14
Φ20
8
Φ36
Φ20
100
Φ36
2 HOLES,Φ 14
A
A
X
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.
SECTIONAL FRONT VIEW AA
SCALE:- 1:1
SYMBOL OF PROJECTION METHOD, NOT SHOWN
60
10
50
40,DEPTH 24
Ø40
50
24
Ø64
10
30
140
L.H.S.V
14
48
14
FRONT VIEW
70
TOP VIEW