drawings
TRANSCRIPT
INSTITUTE OF ENGINEERING
DEPARTMENT OF MECHANICAL
ENGINEERING
ENGINEERING DRAWING II[TUTORIAL SHEETS]
2061
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CONTENTS
Sheet No. 1: Isometric Drawing 3
Sheet No. 2: Oblique Drawing 6
Sheet No. 3: Perspective Projection 7
Sheet No. 4: Dimensioning 9
Sheet No. 5: Limit, Fit and Tolerances 11
Sheet No. 6: Screw, Bolt, Thread, Nut, Stud 12
Sheet No. 7: Riveting, Welding and Piping 16
Sheet No. 8: Dissembly Drawing 20
Sheet No. 9: Assembly Drawing I 21
Sheet No. 10: Assembly Drawing II 23
Sheet No. 11: Electrical and Electronics Drawing 29
Sheet No. 12: Structural and Topographical Drawing 32
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ENGINEERING DRAWING II
SHEET NO: 1
(ISOMETRIC DRAWING)
Draw the isometric drawings from the given orthographic views (Figure T1.1 to T1.8).
30
60
45
1520
8010
20
3545
4010
10
R25
φ25
φ25R25
70
1520
45
10
45°
45°
40
20
1010
10
Figure T1.2
2050
Figure T1.3 Figure T1.4
45
20
4520
Figure T1.1
15
20
15100
25
20
30
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12
12
12
120
120 6820
20
24
20
15 90
40
9
φ 32
2 HOLES φ 9φ1
856
36
Figure T1.8
74
R9
R20φ 34
φ 22
930
Figure T1.7
SQ 5
0
20
φ24
φ25
φ12
Figure T1.6
120
24
120
50
72
72
2065
36
Figure T1.5
60
42
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Prob.No.1.9: A cylindrical slab having 75 mm as diameter and 45 mm thickness, issurmounted by a cube of edge 38 mm. On the top of the cube rests a square pyramid ofaltitude 38 mm and side of base 25 mm. The axes of the solids are in the same straightline. Draw the isomeric view of the combination of these solids.
Prob.No.1.10: A sphere of diameter 45 mm rests centrally over a frustum of cone of basediameter 60 mm, top diameter 40 mm and height 60 mm. Draw isometric projections ofthe combination of solids.
Prob.No.1.11: A cylindrical slab of 70 mm as diameter and 40 mm thickness issurmounted by a frustum of a square pyramid of base side 45 mm, top base side 25 mmand height 50 mm. The axes of the two solids are on a common straight line. A sphere ofdiameter 40mm is centrally placed on top of the frustum. Draw the isometric view of thesolids.
Prob.No.1.12: A cube of sides 60mm is resting on the ground. A cylinder of basediameter 50 mm and height 60mm is kept over that. On top of the cylinder, a hexagonalpyramid of side of base 20 mm and altitude 40 mm is kept. The axis of the three solidslies in the same vertical line. Draw the isometric view.
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ENGINEERING DRAWING II
SHEET NO: 2
(OBLIQUE DRAWING)
Draw oblique drawings from given orthographic projections.
Dia 12
9
156
1435
R40
Dia 20
6030
150
Dia 20 R20
100
12
5015
7050
5010
R26
3010
40
R12
15
Figure T2.6Figure T2.5 10
R25
11517
Figure T2.4
40
R6
25
Figure T2.3
5020
Dia 26
Figure T2.2
1510
80
20
100
4216
Figure T2.1
50
30°
40 R15
6525
50
90
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ENGINEERING DRAWING II
SHEET NO: 3
(PERSPECTIVE PROJECTION)
Draw the perspective projection from the given orthographic views.
20
40
Figure T3.3
35
50
3035
80
Figure T3.1
30
Figure T3.4
Figure T3.2
100
20
60
3045
10 10
1530
30
6050
φ12
972
27 45
54
72
30°
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Prob. No. 3.5: A square prism of side base 30mm and height 50mm rests with its base onthe ground and one of the rectangular faces inclined at 30º to the picture plane. Thenearest vertical edge touches the PP. The station point is 45mm in front of the PP, 60mmabove the ground and opposite to the nearest vertical edge that touches the PP. Draw theperspective view of the prism.
Prob. No. 3.6: A hexagonal prism, side of base 25mm and height 50mm with its base onthe ground plane such that one of its rectangular faces is inclined at 30º to the pictureplane and the vertical edge nearer to PP is 15mm behind it. The station point is 45mm infront of the picture plane, 70mm above the ground plane and lies in a central plane, whichis 15mm to the left of the vertical edge nearer to the picture plane. Draw the perspectiveprojection of the prism.
Prob. No. 3.7: Draw the perspective view of a cube of 25mm edge, resting on ground onone of its faces. It has one of its vertical edges in the picture plane and all its verticalfaces are equally inclined to the picture plane. The station point is 55mm in front of thepicture plane, 40mm above the ground and lies in the central plane, which is 10mm to theleft of the center of the cube.
Prob. No. 3.8: A model of steps has 3 steps of 15mm tread and rise 10mm. The stepsmeasure 60mm wide. The vertical edge of bottom step, which is nearer to the pictureplane, is 25mm behind PP and the width of steps recede to the left at an angle of 30º toPP. The station point is 100mm in front of PP and 60mm above the ground plane and30mm to the right of the vertical edge, which is nearest to PP. Draw the perspective viewof the model.
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ENGINEERING DRAWING II
SHEET NO: 4(DIMENSIONING)
1. For Figure T4.1, dimension its orthographic view by aligned system of dimensioning.
20
30
45
20
10
2520
40
100
Figure T4.12. For Figure T4.2, dimension its orthographic view by unidirectional system of
dimensioning.
4818
150
7248
18
22 42
24
Figure T4.2
3. Measure and dimension properly as per dimensioning rules for holes given in FigureT4.3 (a) to Figure T4.3(c).
(a) (b) (c)Figure T4.3
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4. Measure and dimension properly as per dimensioning rules for counter sinks andcounter bores given in Figure T4.4 (a) and Figure T4.4 (f).
5. Dimension the chamfers shown in Figure T4.5 (a) & (b), external threads shown inFigure T4.5(c), internal threads shown in Figure T4.5 (d).
(a) (b) (c)
(d) (e) (f)
Figure T4.4
(a) (b) (c) (d)
Figure T4.56. Dimension the tapered features shown in Figure T4.6 (a) & (b).
(a) (b)Figure T4.6
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ENGINEERING DRAWING II
SHEET NO: 5(LIMIT, FIT AND TOLERANCES)
1. Find (i) type of fit and (ii) tolerances of a 45 mm diameter shaft rotating at a normalspeed.
2. Fix the limits of tolerance and allowance for a 25 mm diameter shaft and hole pairdesignated by H8/d9. Comment on the application of this type of fit.
3. Suggest suitable fits and their letter and tolerance grades for the components shown inFigure T5.3.
Figure T5.3
4. Draw the standard symbol for the machining processes:• Surface to be obtained without removal of material.• Surface to be coated.• Surface to be precision grinding.• Surface to be obtained by fine turning.
5. Draw the roughness grade symbols for the surfaces of an object shown in FigureT5.5.
Figure T5.5
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ENGINEERING DRAWING II
SHEET NO: 6
(SCREW/BOLT/THREAD/STUD/NUT)1. Draw the metric thread, as shown in Figure T6.1, taking suitable value of pitch.
0.125 P
0.25 P
0.37
5 H
0.62
5 H
60°
P
0.5 P
MA
JOR
DIA
ME
TE
R
PIT
CH
DIA
ME
TE
R
MIN
OR
DIA
ME
TE
R
H = 0.866025 P
0.12
5 H
H0.
25 H
Figure T6.1: Metric Thread2. Draw the simplified and schematic symbols for internal with and without section as
shown in the Figure T6.2. Also draw the external threads.
(a) (b) (c)
(d) (e) (f) (g) (h)
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Figure T6.2 (a): Simplified Symbols
(i) (j) (k)
(l) (m) (n) (o) (p)
Figure T6.2 (b): Schematic Symbols3. Draw front view and top view of pieces fasten together with 18 mm square bolt and
nut as shown in Figure T6.3.
22 22 22
5050
Figure T6.34. Draw a bolted joint to conventional ratios as shown in Figure T6.4. Take d = 20 mm,
m = 20 mm and n = 30 mm.5. Draw a screw fastening shown in Figure T6.5 with suitable value of dimensions.
6. Draw a stud joint to conventional ratios for the pieces shown in Figure T6.6.
7. Taking suitable value of 'D' draw the eyebolt as shown in the Figure T6.7.
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d1
d
c
l
l
0
R
A
R2
D
HS
nm
h
R1
DW K
d1 = 0.85 d
H = 0.8 d
h = 0.7 dDW = 2.5 d
S = 0.15 dA = 1.1 d
l0 = 2 d to 2.5 d
R = 1.5 d
R1 = dR2 = 0.5 cc = S to 2 SK = 3 d
D = 2 d
Figure T6.4: Hexagonal Bolt
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26
M24
2540 52
70
74 60
27 22
56
466
22 60
720
301420
M12 M12
1490°
Figure T6.5 Figure T6.6
4 D
2 D
1.4
D2.
8 D
0.6D
0.8 D
DFigure T6.7: Eye Bolt
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ENGINEERING DRAWING II
SHEET NO: 7
(RIVETING, WELDING & PIPING)
1. Draw the plan and sectional elevation of the following riveted joints. Take thediameter of the rivet 24 mm.• Single riveted lap joint• Double riveted chain lap joint• Double riveted zig-zag lap joint• Single riveted, single strap butt joint• Single riveted, double strap butt joint• Double riveted, double strap chain butt joint• Double riveted, double strap zig-zag butt joint
2. Figure T7.2(a) and T7.2(b) show the isometric of a machine part to be fabricated bythe welding process. Draw its orthographic view. Choose suitable types of weld andrepresent it on the drawings through respective symbols.
Figure T7.2(a) Figure T7.2(b)
3. Sketch the symbol of the following joints and parts of piping:
• 900 elbow• 450 bend• Reducer• Tee• Cross
• Plug• Union• Nipple• Cap• Check Valve
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4. Redraw a single line and a double line drawing of the portion of a piping system asshown in Figure T7.4.
STEAM MAIN
GATE VALVE
TEE
ELBOW
BOILER
Figure T7.4
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5. Figure T7.5 Shows a building drawing. Sketch an isometric of the building and drawdiagrammatic isometric showing a piping system with overhead tank, solar waterheater system, supply for toilet, kitchen and inlet supply from the underground tankand water pump.
Figure T7.5
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ENGINEERING DRAWING II
SHEET NO: 8(DISSEMBLY DRAWING)
1. Make a complete set of working drawings for a V-block Clamp shown in FigureT8.1.
2. Figure T8.2 shows the assembly drawing of a centering cone. Make a detaildrawing of all parts.
Figure T8.1: V-block Clamp Figure T8.2: Centering Cone
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ENGINEERING DRAWING II
SHEET NO: 9(ASSEMBLY DRAWING I)
1. Figure T9.1 shows the detail drawing of a Stuffing Box for a small steam engine.Assemble the parts and draw the half sectional front view and the top view.
Figure T9.1: Stuffing Box
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2. Figure T9.2 shows the detail drawing of a Universal Coupling for connecting twoshafts. Assemble the parts and draw the sectional front view and the top view.
Figure T9.2: Universal Coupling3. Figure T9.3 shows the detail drawing of a Cross Head for a steam engine.
Assemble the parts and draw the half sectional front view (upper half) and theside view.
Figure T9.3: Cross Head
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ENGINEERING DRAWING II
SHEET NO: 10
(ASSEMBLY DRAWING II)
4. Figure 10.1 shows the detail drawing of a Footstep Bearing. Draw front view ofthe assembly with left half in section and top view in full section and side view.
Figure T10.1: Footstep Bearing
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5. Figure T10.2 shows the detail drawing of a Screw jack. Assemble the parts anddraw the half sectional front view (right half) and the top view.
Figure T10.2: Screw Jack
6. Assemble all parts of the tool post given in Figure T10.3 and draw its sectionalfront view, with the section plane passing through the vertical slot in the body andright side view and top view.
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Figure T10.3: Tool Post
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ENGINEERING DRAWING II
SHEET NO: 10
(ASSEMBLY DRAWING II)
7. Figure 10.1 shows the detail drawing of a Footstep Bearing. Draw front view ofthe assembly with left half in section and top view in full section and side view.
Figure T10.1: Footstep Bearing
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8. Figure T10.2 shows the detail drawing of a Screw jack. Assemble the parts anddraw the half sectional front view (right half) and the top view.
Figure T10.2: Screw Jack
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9. Assemble all parts of the tool post given in Figure T10.3 and draw its sectionalfront view, with the section plane passing through the vertical slot in the body andright side view and top view.
Figure T10.3: Tool Post
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ENGINEERING DRAWING II
SHEET NO: 11
(ELECTRICAL AND ELECTRONOCS DRAWING)
Prob. No. 11.1: The circuit shown in Fig. 11.1 is suitable for classroom or laboratorydemonstrations. After a local radio station is tuned with a regular 9 – volt battery in place,other devices such as photoelectric cells and homemade batteries are substituted.
Make a freehand or mechanical schematic diagram of the circuit, approximatelytwice the size of Fig. 11.1. Use standard symbols and show component values andreference designations, following recommended practices.
Component List
Fig. 11.1 Circuit Demonstrating the Fig. 11.2 Crystal Calibrator (Prob. 11.2) Generation of Electrical Energy (Prob. 11.1)
C1 10- 365 PF variable capacitorD1 Germanium diodeL1 Loopstick antenna coil with center tapT1 Output transformer: 2500 ohm primary, 3 – 4
ohm secondaryQ1 NPN type RF transistor (B = base, C= collector, E =
emitter)Q2 PNP type audio transistor
Prob. No. 11.2: The unit shown in Fig. 11.2 is used to calibrate the turning dials of short-wave communications receivers by providing a check signal every 100 kilohertzthroughout the commonly used bands.
Component List
Reproduce the schematic diagram approximately double size, freehand ormechanically, as assigned. Add standard symbols and include reference designations,computer values, and other data following recommended practices (Layout A – 3 or A 4– 3 adjusted).
Prob. No. 11.3 The circuit of Fig. 11.3 is that of a Variable Frequency Oscillator (VFO)that may be used with transmitters operating in the 80 – meter amateur radio (“ham”)band.
Make a freehand or mechanical schematic diagram, approximately twice the sizeof Fig. 11.3. Use standard symbols and include reference designations and componentvalues, following recommended practices (Layout A – 3 or A 4 – 3 adjusted).
Component List
CapacitorsC1 1000 PFC2 7 – 45 PF trimmerC3 10 PF
CrystalY1 100 KHz
Resistors (ohms)R1 56 KR2 56 K
Integrated CircuitU1 HEP 570 (quad 2 – input gate)
CapacitorsC1 100 PF trimmerC2 50 PFC3 150 PF variableC4 470 PFC5, C6 1000 PFC7, C8 .1 UF
Resistors (ohms)R1, R2, R3 22KR4 270
CoilsL1 6 Uh ceramic or air core
L2 1 MH RF chokeSemiconductors
D1 1N914 silicon diodeD2 6 V, 1 W zener diodeQ1 40673 dual – gate MOSFET transistor
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Fig. 11.3 Variable Frequency Oscillator (Prob. 11.3)
Fig. 11.4 Plan view of a floorProb. No. 10.4: Draw the graphical symbols for
a) Amplifier (General) b) Capacitor (general) c) Fuse (General)d) Inductor (General) e) Resistor (General) f) Generatorg) Motor h) 3 – Phase Wye i) 3 – Phase Deltaj) Thermocouple k) Transformer (Magnetic core)Prob. No. 11.5: Draw a plan view of a electrical wiring diagram (for one floor) havingone bed room, one living room, one kitchen and one bathroom as shown in Fig. 11.4.
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ENGINEERING DRAWING II
SHEET NO: 12(STRUSTURAL DRAWING)
Prob. 12.1: Draw the part drawing for component No. 1, 3, 4, and 6 of the followingstructure with detail dimensions.
Parts List (Steel structure frame of a table)
ComponentNo.
Description Quantity Remarks
8 Nut, Bolt Washer (M 12 × 40) 627 M. S. P1.10 × 150 × 150 46 M. S. P1.8 × 250 × 300 4 Gusset Plate5 M. S. Flat 8 × 75 4 Compute required length4 ISA 75 × 75 × 8 4 Compute required length3 ISA 100 × 100 × 10 42 ISMC 250 × 2000 h =250; b = 110;
d =12; t =182
1 ISMC 250 × 4000 R = 10; r = 5 2
Figure T12.1: Steel structure frame of a table
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Prob. No. 12.2: Draw symbols of six of the common natural surface features (streams,lakes etc.) and six of the common development features (roads, buildings, etc.).
Prob. No. 12.3: Draw a topographical map of a country estate similar to that shown inFig. 12.2.
Figure T12.2