A Text Book on Engineering Graphics - Central Board of Secondary ...

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MACHINE DRAWING (iv) Fig 2.36 is the representation of RH thread. In the case of RH thread, for a clockwise rotation, the thread is screwed on. (v) Draw two thin lines parallel to the axis representing the roots of the thread. (vi) On the thick line, mark the divisions equal to pitch. On the thin line, mark the divisions = (p/2) such that they form the shape of 'V' (vii) Join root to root points with thick lines and crest to crest points with thin lines (viii) The side view has two circles representing the crest and root of the thread. Crest circle is thick and continuous, whereas root circle is drawn thin and incomplete to represent the external thread. Similarly the LH-external V-thread can be represented as follows. Note that the slope point is located on the top line and inclination of the line is opposite of RH thread. see fig 2.37 B B' A Slope = 0.5P LEFT HAND V-THREAD Fig 2.37 2.11.2CONVENTIONAL REPRESETATION OF INTERNAL V-THREADS Fig 2.38 shows the representation of internal V-threads. It shows the sectional view of a threaded hole in the front view. Thick line indicates the crest and thin line indicates the root. Section (hatching) lines are extended up to thick lines. The side view shows a thick circle representing the crest and roots by thin incomplete circle FRONT VIEW SIDE VIEW CONVENTIONAL REPRESENTATION OF INTERNAL V-THREADS Fig 2.38 72 ENGINEERING GRAPHICS
MACHINE DRAWING 2.11.3CONVENTIONAL REPRESENTATION OF EXTERNAL SQUARE THREADS Fig 2.39(i) shows the conventional representation of external RH square threads. The figure is self explanatory. Fig 2.39(ii) shows the LH square threads. P Slope = 0.5 P RIGHT HAND SQUARE THREAD P Fig 2.39(i) LEFT HAND SQUARE THREAD Fig 2.39(ii) 2.11.4CONVENTIONAL REPRESENTATION OF INTERNAL SQUARE THREADS Fig 2.40(i) shows the representation of RH internal square threads and fig 2.40(ii) shown LH internal square thread. RIGHT HAND THREAD (INTERNAL) Fig 2.40 (i) LEFT HAND THREAD (INTERNAL) Fig 2.40 (ii) ENGINEERING GRAPHICS 73
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A Text Boo
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Foreword Design is an integral aspe
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PREAMBLE THE CONSTITUTION OF INDIA
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CHAPTER 1 1.1 INTRODUCTION The obje
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ISOMETRIC PROJECTION 1.2.2 POSITION
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ISOMETRIC PROJECTION B C 30 (i) 5 b
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ISOMETRIC PROJECTION Example 4 : So
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ISOMETRIC PROJECTION Steps (i) Draw
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ISOMETRIC PROJECTION Steps (i) Draw
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ISOMETRIC PROJECTION Solution : Exa
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ISOMETRIC PROJECTION Example 14: So
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ISOMETRIC PROJECTION b o B 30 m a H
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ISOMETRIC PROJECTION Example 20 : S
Page 29 and 30: ISOMETRIC PROJECTION Example 23 : S
Page 31 and 32: ISOMETRIC PROJECTION 1.3.5 SPHERES
Page 33 and 34: ISOMETRIC PROJECTION 5. Draw an iso
Page 35 and 36: ISOMETRIC PROJECTION Steps: 1. Draw
Page 39 and 40: ISOMETRIC PROJECTION Steps: Exmple
Page 45 and 46: ISOMETRIC PROJECTION 7. BELOW: CIRC
Page 47 and 48: ISOMETRIC PROJECTION 30 66 30 15. B
Page 49 and 50: MACHINE DRAWING Fig 2.1 b : Screw t
Page 51 and 52: MACHINE DRAWING (v) RIGHT HAND AND
Page 53 and 54: MACHINE DRAWING 2.4 STANDARD PROFIL
Page 55 and 56: MACHINE DRAWING 2.4.2 METRIC THREAD
Page 57 and 58: MACHINE DRAWING Steps involved are
Page 59 and 60: MACHINE DRAWING 2.5 BOLTS In day to
Page 61 and 62: MACHINE DRAWING (vii) The end of th
Page 63 and 64: MACHINE DRAWING 2.5.3 T-BOLT Exampl
Page 65 and 66: MACHINE DRAWING Steps Involved Exer
Page 67 and 68: MACHINE DRAWING Example 10 : Soluti
Page 69 and 70: MACHINE DRAWING 2.6.2 SQUARE NUTS E
Page 71 and 72: MACHINE DRAWING Solution : Steps In
Page 73 and 74: MACHINE DRAWING Steps Involved Exam
Page 75 and 76: MACHINE DRAWING Example 15: Solutio
Page 79: MACHINE DRAWING 2.10 INTRODUCTION F
Page 87 and 88: MACHINE DRAWING Exercises NOTE: Ass
Page 93 and 94: MACHINE DRAWING 2.15.1.3 DOUBLE HEA
Page 95 and 96: 3 CHAPTER All of you have seen a bi
Page 97 and 98: BEARINGS 3. Plummer Block or Pedest
Page 99 and 100: BEARINGS Answer of Fig. 3.3 10 20 2
Page 101 and 102: BEARINGS Question: The figure given
Page 103 and 104: BEARINGS R5 R6 2 HOLES FOR BOLTS 24
Page 105 and 106: A BEARINGS Answer of fig 3.12 20 40
Page 107 and 108: BEARINGS NOTE : As per our syllabus
Page 109 and 110: BEARINGS Question: The figure given
Page 111 and 112: BEARINGS EXPLODED VIEW OF A FOOT ST
Page 113 and 114: BEARINGS 5 15 15 40 15 15 ENGINEERI
Page 115 and 116: BEARINGS FOOT STEP BEARING Ø 120
Page 117 and 118: ROD JOINTS DIMENSIONS OF A COTTER:
Page 119 and 120: ROD JOINTS SLEEVE AND COTTER JOINT:
Page 121 and 122: ROD JOINTS Solution of fig : 4.5 Qu
Page 123 and 124: ROD JOINTS Answer of fig. 4.9 50 50
Page 125 and 126: ROD JOINTS Question: The details of
Page 127 and 128: ROD JOINTS Exercise: The three view
Page 129 and 130: ROD JOINTS KNUCKLE JOINT OR PIN JOI
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ROD JOINTS Question: fig 4.19(a) sh
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ROD JOINTS Question: The figure 4.2
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ROD JOINTS Exercises: The three vie
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ROD JOINTS Dimensions of a Gib and
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ROD JOINTS 96 66 12 GIB 26 COTTER T
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ROD JOINTS Exercise: The two views
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5 CHAPTER Machines use various part
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TIE-ROD AND PIPE JOINTS (We have di
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TIE-ROD AND PIPE JOINTS Example 2:
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TIE-ROD AND PIPE JOINTS RH SIDE VIE
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TIE-ROD AND PIPE JOINTS 5.2.1.1 FEA
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TIE-ROD AND PIPE JOINTS (1) FLANGE
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TIE-ROD AND PIPE JOINTS Let us cons
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TIE-ROD AND PIPE JOINTS WHAT HAVE W
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SHAFT COUPLINGS 6.1 FLANGE COUPLING
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SHAFT COUPLINGS It can also be noti
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SHAFT COUPLINGS Ø100 Ø75 Ø50 Ø2
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SHAFT COUPLINGS Exercise 6.1 Fig 6.
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SHAFT COUPLINGS ASSEMBLED PICTORIAL
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SHAFT COUPLINGS Let us take another
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SHAFT COUPLINGS Exercise 6.2 1. FIG
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CHAPTER 7 7.1 INTRODUCTION PULLEYS
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PULLEYS So pulley is a simple machi
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PULLEYS Solution : Ø144 Ø126 Ø11
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PULLEYS Example 3 : Draw the Front
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