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Bertoline−Wiebe:

Fundamentals of Graphics

Communication, Fifth

Edition

3. Engineer ing Geometry Text 135© The McGraw−Hill

Companies, 2007

3.6 Using isometric grid paper, construct the X, Y, andZ axes. Reference Figure 3.4. Using the right-hand

rule, place points at the following locations:

a. 0,0,0

b. 4,0,0

c. 4,2,0

d. 0,2,0

e. 0,0,2

f. 4,0,2

g. 4,2,2

h. 0,2,2

Connect points a–b, b–c, c–d, d–a.

Connect points e–f, f–g, g–h, h–e.

Connect points d–h, c–g, a–e, b–f.

What geometric solid is produced?

3.7 (Figure 3.67) Draw the offset arm, using the given

dimensions.

3.8 (Figure 3.68) Draw the rocker arm gasket, using the

given dimensions.

3.9 (Figure 3.69) Draw the adjustable support, usingthe given dimensions.

3.10 (Figure 3.70) Draw the ratchet and detent, using the

given dimensions.

Engineering Geometry 123

100

R38R16

2X

O38

Offset armFigure 3.67

178

R48

O24

O64

R24

Rocker-arm gasketFigure 3.68

8.00

1.00

1.00

O2.50

R4.75

R4.75   4.00

R1.62

R1.62

1.12

2 HOLES

Adjustable supportFigure 3.69

1.13

ø .50

ø 1.50

ø 3.00

1.75

.63 65°

ø 1.50.25

.38

Ratchet

Wheel

(15 Teeth)

DetentDetent

Pivot

ø 3.00 TYP.

ø .50

ø 1.001.36

ø 2.75

1.50 1.40

Ratchet and detentFigure 3.70

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Bertoline−Wiebe:

Fundamentals of Graphics

Communication, Fifth

Edition

3. Engineer ing Geometry Text136 © The McGraw−Hill

Companies, 2007

3.11 (Figure 3.71) A Geneva stop mechanism has a dri-ving wheel that turns at a constant speed and a dri-

ven wheel that turns intermittently. The driven

wheel rotates one-fourth turn every time the drive

pin enters and leaves a slot. Begin the drawing by

constructing triangle ABC, then locate point P andcenter line CP. After the drawing is complete, mea-

sure angle X.

3.12 (Figure 3.72) Construct the piston and the crank-

shaft.

124 CHAPTER 3

Geneva stop mechanismFigure 3.71

ø 2.25

2.38

.13

2.63

3.50 Stroke

.55

ø .50

3.75

65°ø 3.50

ø 1.75

ø .75

Piston

Connecting

Rod

Crankshaft

ø 2.00

Piston, connecting rod, and crankshaftFigure 3.72

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Bertoline−Wiebe:

Fundamentals of Graphics

Communication, Fifth

Edition

3. Engineer ing Geometry Text 137© The McGraw−Hill

Companies, 2007

3.13 Create an A-size drawing sheet, then constructa helix from a right circular cylinder that has a

2-inch-diameter base and is 4 high.

3.14 (Figure 3.73) Draw the cam arm, using the given

dimensions and calculating the missing ones. The

curve is made of five tangent circular arcs. The rise

is the change in distance from the center of the hole

in the cam arm.

3.15 (Figure 3.74) Draw the slip cover, using the givendimensions.

3.16 (Figures 3.75 through 3.84) Draw the part, using

the given dimensions.

Engineering Geometry 125

.751.25

2.35

35°

40°

O

42°

32°

A

B

CD

E

F

3.00

R .50

R .38Ø .625

.13 RISE.25 RISE

.06 RISE

Cam armFigure 3.73

Slip coverFigure 3.74

1.51

2.37

3.63

5.25

.45

4X R .50

R .50R .25

R 5.00

1.88

R 4.63

3.25

2.50

1.75

R .38

1.38

2X R .632X R .38

2X R .87

2X R .25

4X R .38

6.88

7.63

R 200.00

R 130.00

130.00

15°

65.00

2X ø 25.00

25.00

TYP.

2X R 25.00

2X R 38.00

4X R 12.00

2X R 25.00

15°

METRIC

Split guideFigure 3.75

4X 15°

.881.75

4X R .19

4X R .19

R 1.75

R 3.06

2X R .38

R 3.63

R 3.25

R 3.81

FILLETS & ROUNDS

R .38 U.O.S

4X ø.38

Arched followerFigure 3.76

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Bertoline−Wiebe:

Fundamentals of Graphics

Communication, Fifth

Edition

3. Engineer ing Geometry Text138 © The McGraw−Hill

Companies, 2007

126 CHAPTER 3

2X R 310

2X R 250

75°

100

60

Highway interchangeFigure 3.77

6.00 1.63

R 2.1360°

3.50

ø 2.50 TYP.

ø 3.25 TYP.

R (?)

REVERSE (OGEE) CURVE CONSTRUCTION

Offset pipeFigure 3.78

15°

R .38

2X R .63

2X ø .50ø 1.26

R 1.25

ø .75

3.25

R .63

2X R .63

.50

60°

2X R 1.25

R 2.50

R 3.13

.91

2.17

Butterfly spacerFigure 3.79

7.204X R 5.00

R 1.40

.50

FILLETS & ROUNDS

R .20 U.O.S.

7.20

1.00

R 4.20

R 3.00ø 2.80

3.60

3.60

Offset wrenchFigure 3.80

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Bertoline−Wiebe:

Fundamentals of Graphics

Communication, Fifth

Edition

3. Engineer ing Geometry Text 139© The McGraw−Hill

Companies, 2007

3.17 (Figure 3.85) Create sketches, wireframe, or sur-face models by sweeping the profiles shown in the

figure using a scale assigned by your instructor.

Do the following with each of the profiles:

a. Sweep linearly 5 units along theZ axis.

b. Sweep linearly along the vector (2,3,5).

c. Sweep 360° about the Y axis.

d. Sweep 360° about the X axis.

e. Sweep 90° about the X axis.

f. Sweep 270° about the –Y axis.g. Sweep 360° about a Y axis offset 2 units in the

X direction.

h. Sweep 180° about an X axis offset 3 units in the

Y direction.

i. Sweep the profile about two different axes to

create two objects. Combine the two objects to

create a new single object.

Engineering Geometry 127

3.00

2X R .88

4X R .63

2.50

60°

R .75

R 2.50

FILLETS & ROUNDSR .38 U.O.S.

2.13

2.25

5X ø .75

Centering plateFigure 3.81

R 1.125

2X R 6.250

1.000

R 1.000

4.000 2.500

2X R 1.500

R 1.880

.500

1.000

R .625

1.25

2.375

Harness guideFigure 3.82

R 4.40

R 4.60

R 5.50

R 6.30R 4.80

45°

4.00

R 4.90

60°45°

R 1.40

R 9.10

60°

1.00

R 5.50

60°

45°

30°

R .30

Variable guideFigure 3.83

2.70

3.20

5.00

3X ø .80

X

W

Z

3X R .80

Y

W = X

3Y = Z

TransitionFigure 3.84