engeneering drawing - tutorial-rachid · straight lines procedure Assume that a radius of 25 mm is required to touch the lines shown in the figures. Draw lines parallel to the given

GE 1021: ENGINEERING DRAWING AND GRAPHICs

DR. RACHID & DR. ABDELKADER

[TUTORIAL SHEETS]

1435-1436 H / 2014-2015 G

GE 1021: Engineering Drawing and Graphics

TUTORIAL SHEETS Page 2

CONTENTS

TOPIC NO. 1: TYPES OF LINES 3

TOPIC NO. 2: GEOMETRICAL CONSTRUCTIONS AND TANGENCY 9

TOPIC NO. 3: ORTHOGRAPHIC PROJECTION 21

TOPIC NO. 4: ISOMETRIC PROJECTION 36

TOPIC NO. 5: MISSING VIEW 48

TOPIC NO. 6: SECTIONING 60

TOPIC NO. 7: DIMENSIONING 67

TOPIC NO. 8: SOLVED PROBLEMS 72



TOPIC NO. 1:

TYPES OF LINE



1- Description and representation of lines

GE 102

TUTORIAL SHEETS

2- Draw the following

21: Engineering Drawing and Graphic

figures in A3 sheet paper

ics

Page 5







NOTES

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TOPIC NO. 2:

GEOMETRIC CONSTRUCTION

AND TANGENCY



1. Reconstruct the following Figures.

2. bisect a given angle AOB procedure

1. With centre O, draw an arc to cut OA

at C and OB at D.

2. With centres C and D, draw equal

radii to intersect at E.

3. Line OE bisects angle AOB.

3. bisect a given straight line AB procedure

1. With centre A and radius greater than

half AB, describe

an arc.

2. Repeat with the same radius from B,

the arcs intersecting

at C and D.

3. Join C to D and this line will be

perpendicular to and

bisect AB.

4. bisect a given arc AB procedure

1. With centre A and radius greater than

half AB, describe

an arc.

2. Repeat with the same radius from B,

the arcs intersecting

at C and D.

3. Join C to D to bisect the arc AB.



5. find the centre of a given arc AB procedure

1. Draw two chords, AC and BD

2. Bisect AC and BD as shown;

the bisectors will intersect

at E.

3. The centre of the arc is point E.

6. inscribe a circle in a given triangle ABC procedure

1. Bisect any two of the angles as

shown so that the bisectors

intersect at D.

2. The centre of the inscribed circle

point D.

7. circumscribe a circle around triangle ABC procedure

1. Bisect any two of the sides of

the triangle as shown, so

that the bisectors intersect at D.

2. The centre of the circumscribing c

is point D.



8. draw a tangent to a point A on the

circumference of a circle, centre O

procedure

Join OA and extend the line for a short

distance. Erect a

perpendicular at point A by the method sho

9. draw a tangent to a circle from any given

point A outside the circle procedure

Join A to the centre of the circle O.

Bisect line AO so that

point B is the mid-point of AO. With

centre B, draw a semicircle

to intersect the given circle at point C.

Line AC is the

required tangent.

10. draw an external tangent to two circles procedure

Join the centres of the circles by line AB,

bisect AB, and draw a semi-circle.

Position point E so that DE is equal to

the radius of the smaller circle. Draw

radius AE to cut the semicircle at point

G. Draw line AGH so that H lies on the

circumference of the larger circle. Note

that angle AGB lies in a semi-circle and

will be 90_. Draw line HJ parallel to BG.

Line HJ will be tangential to the two

circles and lines BJ and AGH are the

normals.



11. draw an internal tangent to two circles procedure

Join the centres of the circles by line AB, bisect

AB and

draw a semi-circle. Position point E so that DE

is equal to the radius of the smaller circle BC.

Draw radius AE to cut the semi-circle in H. Join

AH; this line crosses the larger circle

circumference at J. Draw line BH. From J draw

a line parallel to BH to touch the smaller circle

at K. Line JK is the required tangent. Note that

angle AHB lies in a semi-circle and will

therefore be 90_. AJ and BK are normals.

12. draw internal and external tangents to two

circles of equal diameter procedure

Join the centres of both circles by line AB. Erect

perpendiculars at points A and B to touch the

circumferences of the circles at points C and D.

Line CD will be the external tangent. Bisect line

AB to give point E, then bisect BE to give point

G. With radius BG, describe a semi-circle to cut

the circumference of one of the given circles at

H. Join HE and extend it to touch the

circumference of the other circle at J. Line HEJ

is the required tangent. Note that again the angle

in the semi-circle, BHE, will be 90_, and hence

BH and AJ are normals.

13. draw a curve of given radius to touch two

circles when the circles are outside the radius procedure

Assume that the radii of the given circles are 20

and 25 mm, spaced 85 mm apart, and that the

radius to touch them is 40 mm.

With centre A, describe an arc equal to 20 + 40

= 60 mm.

With centre B, describe an arc equal to 25 + 40

= 65 mm.

The above arcs intersect at point C. With a

radius of 40 mm, describe an arc from point C as shown, and note that the points of tangency

between the arcs lie along the lines joining

the centres AC and BC. It is particularly

important to note the position of the

points of tangency before lining in

engineering drawings, so that the exact

length of an arc can be established.



14. draw a curve of given radius to touch two

circles when the circles are inside the radius procedure

Assume that the radii of the given

circles are 22 and 26 mm,

spaced 86 mm apart, and that the

radius to touch them is

100 mm.

With centreA, describe an arc equal to

100 _ 22 = 78 mm.

With centre B, describe an arc equal to

100 _ 26 = 74 mm.

The above arcs intersect at point C.

With a radius of

100 mm, describe an arc from point C,

and note that in this

case the points of tangency lie along

line CA extended to D

and along line CB extended to E.

15. draw a radius to join a straight line and a given

circle procedure

Assume that the radius of the given

circle is 20 mm and that

the joining radius is 22 mm.

With centre A, describe an arc equal to

20 + 22 = 42 mm.

Draw a line parallel to the given

straight line and at a

perpendicular distance of 22 mm from

it, to intersect the arc at point B.

With centre B, describe the required

radius of 22 mm,

and note that one point of tangency

lies on the line AB at C;

the other lies at point D such that BD

is at 90_ to the straight line.



16. draw a radius which is tangential to given

straight lines procedure

Assume that a radius of 25 mm is

required to touch the lines

shown in the figures. Draw lines

parallel to the given straight

lines and at a perpendicular

distance of 25 mm from them to

intersect at points A. As above,

note that the points of tangency

are obtained by drawing

perpendiculars through the

point A to the straight lines in each c

17. draw a radius which is tangential to given

straight lines



2. Draw the contour lines of the following parts in A3 size drawing sheet









NOTES

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TOPIC NO. 3

ORTHOGRAPHIC

PROJECTION



1. Creating an orthographic projection

First and third angle projection symbols.

Projection symbol proportions.

GE 1021:

TUTORIAL SHEETS

1. Execises in readRead and Name EaProjection

Solved Exam

1: Engineering Drawing and Graphics

in reading me Each Projection Based on 1

ample

Page 23

1st. Angle

GE 1021:

TUTORIAL SHEETS


Page 24

GE 1021:

TUTORIAL SHEETS


Page 25



2. Study the following isometric views and draw their orthographic views, Solve in Same Paper



3. Make a complete orthographic drawing (with necessary number of projections in third angle projection) of each object Shown.

Fig. 3.1

Fig. 3.2



Fig. 3.3

Fig. 3.4



Fig. 3.5

Fig. 3.6



Fig. 3.7

Fig. 3.8



Fig. 3.9

Fig. 3.10



Fig. 3.11

Fig. 3.12



Fig. 3.13

Fig. 3.14



Fig. 3.15

Fig. 3.16



NOTES

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TOPIC NO. 4

ISOMETRIC PROJECTION



1. Example of an Isometric view from a given orthographic views.

solution

Fig. 4.1



1. Study the following orthographic views and draw their isometric view, Solve in Same Paper

Fig4.2



2. Draw an Isometric view from the orthographic views given. Use Drawing Tools

Fig. 4.3

Fig. 4.4



Fig. 4.5

Fig. 4.6



Fig. 4.7

Fig. 4.8



Fig. 4.9

Fig. 4.10



Fig. 4.11

Fig. 4.12



Fig. 4.13

Fig. 4.14



Fig. 4.15

Fig. 4.16



Fig4.18

Fig. 4.17

Fig4.18



NOTES










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TOPIC NO. 5:

MISSING VIEW



1. Select, from the views A to L below, the missing view from each of the drawings 1 to 12. Insert the letter in the space provided.

Example: the missing view from drawing number 1 is C.

Fig. 5.1



2. Study the following isometric and orthographic views and draw the missing views (Solve in Same Paper )

Fig. 5.2



3. Deduce The Third View for the Given Two Views, Solve in Same Paper

Fig. 5.3

Fig. 5.4



Fig. 5.5

Fig. 5.6



Fig. 5.7

Fig. 5.8

GE 102

TUTORIAL SHEETS

4. Deduce The TSolve in A4 S

Fig. 5.9

Fig. 5.10

021: Engineering Drawing and Graphi

e The Third View for the Given T Sketch . Use Drawing Tools

hics

Page 54

iven Two Views, g Tools

GE 102

TUTORIAL SHEETS

Fig. 5.11

Fig. 5.12


hics

Page 55

GE 102

TUTORIAL SHEETS

Fig. 5.13

Fig. 5.14


hics

Page 56



Fig. 5.15

Fig. 5.16



Fig. 5.17



NOTES

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TOPIC NO. 6:

SECTIONING



1. Draw the sectional view AA of the following objects

Fig. 6.1



Fig. 6.2



2. Draw both Of the sectional views A-A and B-B of the following objects

Fig. 6.3



Fig. 6.4



3. Draw the front view, the sectional right view and the top view

Fig. 6.5



NOTES

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TOPIC NO. 7:

DIMENSIONING



1. Consider the incorrectly dimensioned object shown. There are six dimensioning mistakes. List them and then dimension the object correctly.

Fig. 7.1

2. Consider the incorrectly dimensioned object shown. There are four dimensioning mistakes. List them and then dimension the object correctly.

Fig. 7.2



3. Construct and dimension the following drawing

Fig. 7.3



4. Construct and dimension three projections of the following model

Fig. 7.4



NOTES






















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TOPIC NO. 8:

SOLVED PROBLEMS



Fig. 8.1

Fig. 8.2



Fig. 8.3

Fig. 8.4



Fig. 8.5

Fig. 8.7



Fig. 8.8

Fig. 8.9



Fig. 8.10

Fig. 8.11



Fig. 8.12

Fig. 8.13



Fig. 8.14

Fig. 8.15



Fig. 8.16

Fig. 8.17



NOTES






















Documents

engeneering drawing - tutorial-rachid · straight lines procedure Assume that a radius of 25 mm is required to touch the lines shown in the figures. Draw lines parallel to the given