Architecture Chapter 19 Homework Material Hc112 Thk Problem Based Original Art

CHAPTER 19 PRECISION SHEET

METAL DRAFTING PROBLEMS

INSTRUCTIONS

1. From the given sketch, draw the required views.

2. Include all dimensions needed using the specified dimen-

sioning system and correct ASME dimensioning standards.

3. Use an appropriate sheet size, border, and ASME standard

sheet blocks.

4. Include the following general notes at the lower-left corner

of the sheet .5 in. each way from the corner border lines:

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NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME Y14.5-2009.

2. REMOVE ALL BURRS AND SHARP EDGES.

Additional general notes can be required, depending on the

specifications of each individual assignment. Use the following

for tolerances for unspecified inch values. A tolerance block is

recommended as described in Chapter 2.

Unspecified Tolerances

Decimals In.

X6.1

XX 6.01

XXX 6.005

ANGULAR 6309

FINISH 125 µin.

For metric drawings, provide a general note that states TOLER-

ANCES FOR UNSPECIFIED DIMENSIONS COMPLY WITH ISO

2768-m. Provide a general note that states SURFACE FINISH

3.2 µm UNLESS OTHERWISE SPECIFIED.

(00.000)

(.812)

(5.812)

(6.625)

(1.875)

(3.500)

(5.125) (UP 908 @ .250 R)

(UP 908 @ .250 R)

(7.000)

2X Ø(.406)

FLAT PATTERN

(SCALE .50X)

SIDE OF

TANK REF

2X Ø

.416

.396

2X .281

.218

Ø .030 A

A

B

C

BCR

6.656

6.593

5.000

3.531

3.468

.843

.812

1.750

2.031

1.968

PRECISION SHEET METAL DETAIL

DRAWINGS

Part 1: Problems 19.1 Through 19.12

PROBLEM 19.1 Drawing displayed in form view and flat

pattern (in.)

Part Name: Mounting Bracket

Material: .23 THK 5086-H32

Courtesy TEMCO

DRAFTING

TEMPLATES

To access CADD template

files with predefined drafting

settings, go to the Student

Companion Website, select

Student Downloads and

Drafting Templates, and then

select the appropriate

template file.

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(00.000)

(.437)

(1.062)

(1.500)

(1.000)

(1.125)

(1.750)

(2.750)

1.062

.437

.625

1.250

.031

[

1.781

1.718

1.031

.968

2X .312

.250

[

2X (.281)

[

1.531

1.468

UP 908 @ SHARP R

B

A

AB

PROBLEM 19.2 Drawing displayed in form view and flat

pattern (in.)

Part Name: Bracket

Material: 14 GA GALV CRS

Courtesy TEMCO

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PROBLEM 19.3 Chassis layout (in.)

Part Name: Chassis

Material: Aluminum

Given: The engineer’s rough sketch of a computer component

chassis.

Do the following using correct ASME standards:

1. Make a flat pattern drawing of the given chassis on properly

sized sheet. Full scale is recommended.

2. Use arrowless tabular dimensioning from the given

datums.

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000

.250

1.750

2.00

5.031

8.00

10.125

AA

C

D

C

000

.500

.625

5.875

.125 THK

10.250

000

.500

3.125

7. 1 2 5

8.750

10.625

12.625

14.000

2.50

4.875

6.500

7. 1 2 5

3.25

4.375

2X R

.250 .500

.125

.250

DETAIL D

BEND RADIUS = .062

AA

AAA

ABB

908

PROBLEM 19.4 Chassis layout

Given: The engineer’s rough sketch of a computer component

chassis.

Do the following:

1. Make a flat pattern drawing of the given chassis on a properly

sized sheet. Full scale is recommended. Establish the flat

pattern layout dimension by bend allowance calculations.

Show all math formulas and calculations on another paper.

2. Use arrowless tabular dimensioning from the given datums.

Dimensioning Table

Hole Symbol Hole Diameter Depth Quantity

A .123 Through 9

B .230 Through 2

C .469 .030 2

D See detail D Through 1

3. Standard dimensioning is needed for the total length of flat

pattern and a dimension from one datum to the bend line in

the flat pattern.

PROBLEM 19.5 Display of part in form view with flat pat-

tern shown as phantom line (in.)

Part Name: Formed Plate

Material: HC-112 6 mm THK

Problem based on original art courtesy Hyster Company.

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PROBLEM 19.6 Display of part in form view and in flat

pattern (in.)

Given the following engineer’s layout, draw the flat pattern and

the formed view. Use geometric dimensioning and tolerancing as

shown.

Part Name: Mounting Bracket

Material: 11 GA A569

Courtesy TEMCO

FLAT PATTERN

FORM VIEW

(3.546)

1. 12 5

.562

1.663

2X

(1.882)

2X (2.015)

2.250

(5.211)

2X R .281

.218

R

2X

.125

.075

2X .448

.436

.572

.562

¥

2X R .218

.156

10X R

.156

.093

2X (1.812)

9.031

8.968

1.281

1.218

UP 908

@ .187R

UP 908 @

.187R

2X R 8.876

8.814

1.656

2.031

1.968

3.593

3.531

7. 1 2 5

7.062

X

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1.891

3.783

2.641

5.283

R.5004X Ø1.0152X

Ø.280

.750

1.500

DOWN 180° R.525

CLB

SEE FOLDED VIEW

(R.525)BEND

(1.050)

PROBLEM 19.7 Display of 3-D part model, part in form view

and with flat pattern (in.)

Part Name: U-Strap

Material: 14 GA ASTM A366

Draw the 3-D model, formed views, and flat pattern using

unidirectional dimensioning.

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PROBLEM 19.8 Flat pattern (in.)

Part Name: Bracket

Material: 11-gauge (.1196 in.) SAE 1040 steel

The bend radius is equal to the thickness of the material.

Draw the flat pattern using unidirectional dimensioning.

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PROBLEM 19.9 3-D model, flat pattern, and punch ID (in.)

Part Name: Mounting Stand

Material: 11-gauge (.1196 in.) ASTM 525

Draw the 3-D model and the flat pattern using rectangular

coordinate dimensioning without dimension lines. Use the

punch identification and draw the punch details.

DETAIL PUNCH A

SCALE 2 / 1

A

DOWN 90° R.120

4X PID A

DOWN 90° R.120

.000

1.896

.100

2.896

8.896

11.692

11.792

13.688

.000

1.896

.100

1.896

5.896

7.692

7.792

9.688

1.000

3X R

1.000

2.000

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PROBLEM 19.10 3-D model, flat pattern, and punch ID (in.)

Part Name: Support Bracket

Material: 11-gauge (.1196 in.) ASTM 304

Draw the 3-D model and the flat pattern using rectangular

coordinate dimensioning without dimension lines. Use the

punch identification and draw the punch details.

.000

.380

.500

.750

1.500

2.250

2.500

2.620

3.000

.000

.625

1.321

1.516

2.927

3.000

3.693

4.323

2X PID 67495B

PID 67654A

CLB

BDN 90° X R.120

CLB

BUP 90° X R.120

.0650

.0325

Ø.4680

R.00704X

.2000

PUNCH 67495B

SCALE 2:1

2X R

.5000

1.0000

PUNCH 67654A

SCALE 2:1

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PROBLEM 19.11 3-D model and flat pattern (in.)

Part Name: Left Outer Tri-bracket

Material: 18-gauge ASTM 366

4X Ø.250 WELD

HOLE

DOWN 90° R.075

3X R.508 MIN

1.070

.732

3.543

2.155

4.290

4.574

.986

.582

4.598

.520

45°

60°

1.694

1.252

4.608

3.800

.989

4.919

5.227

5.270

1.070

.986

.582 .520

45°

30°

Ø1.015 MIN

Draw the 3-D model and the flat pattern using unidirectional

dimensioning.

Courtesy 2-Kool Inc.

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PROBLEM 19.12 Part in form view and with flat pattern (in.)

Part Name: Fender Foot Rest

Material: 18-gauge ASTM 366

Draw the form views and the flat pattern using unidirectional

dimensioning.

Courtesy 2-Kool Inc.

R.048 MIN(BEND 2X )

3.500()

3.834

1.6252X

2.2222X

BEND DOWN 90° X R.048

R.508 MIN4X

3.417

1.709

4.445

.2152X

8.000

3.250

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