Architecture Chapter 15 Homework Welding representations and assembly of welded parts in Chapter

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CHAPTER 15 WORKING DRAWINGS

PROBLEMS

INSTRUCTIONS

1. From the given engineering sketches or layouts, prepare a

complete set of working drawings, including details assembly

and parts list. Use appropriately sized standard ASME sheets

with border and sheet blocks. Determine which views and

dimensions should be used to completely detail each part. In

addition, determine the views, parts list, dimensions, and

notes, if any, for the assembly drawing. Use ASME standards.

The complete set of working drawings should be prepared

with one detail drawing per sheet using multiview projection

and with the assembly drawing and parts list on one sheet

unless otherwise specified. All purchase (standard) parts are

completely identified in the parts list. Use the sketches or

layouts as a guide to draw original multiview drawings on

adequately sized sheets. Use drafting applications that you

have learned, such as auxiliary views and sectioning tech-

niques, as needed for each drawing. Add all necessary dimen-

sions and notes using unidirectional dimensioning. Many of

the problems are designed to be manufactured as projects in

the manufacturing (machine) technology department.

2. When using solid modeling software, create the solid model

using the given geometry and confirm the accuracy of the given

engineering information as you proceed. Consult with your

instructor or supervisor if you discover errors in the geometry

and revise the drawings as needed to make the geometry

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accurate and confirm that parts fit together. Use your com-

pleted part solid models to develop fully dimensioned 2-D de-

tail drawings. Place a 3-D model in the upper-left corner of the

drawing for use as a visualization aid. Assemble the part models

and create a 2-D assembly drawing with a correlated parts list.

3. Include the following general notes at the lower left corner of

each sheet .5 in. (13 mm) each way from the corner border lines:

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME

Y14.5-2009.

2. REMOVE ALL BURRS AND SHARP EDGES.

Note number 2 does not normally apply to the assembly draw-

ings. Additional general notes may be required, depending on

the specifications of each individual assignment. Use the follow-

ing 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.

choose, or if you are assigned to solve these advanced problems,

you should study Chapters 16, 17, and 18 as you encounter parts

in your problems that relate to content found in those chapters.

This is the kind of challenge that you can face in the real world of

engineering drafting. Often you have to go ahead on your own or

seek additional instruction when you encounter new and varied

obstacles. The following are the types of features that require you

to study additional content beyond this chapter:

■Linkages, cams, gears, and bearings in Chapter 16.

■Belt and chain drives in Chapter 17.

■Welding representations and assembly of welded parts in

Chapter 18.

Special Note: Some problems in this chapter contain errors,

missing information, or slight inaccuracies. This is intentional

and is meant to encourage you to apply appropriate problem-

solving methods, engineering, and drafting standards in order to

solve the problems. This is meant to force you to think about

each part and how parts fit together in the assembly. As in real-

world projects, the engineering problem should be considered as

a basis for your preliminary layouts. Always question inaccura-

cies in project designs and consult with the proper standards

and other sources. In some cases, an error might be the source of

engineering changes provided by your instructor, but this is de-

termined by your specific course objectives. Other situations re-

quire that corrections be made during the development of the

original design drawings. This is not intended as a source of

frustration but is considered part of an engineering drafter’s

daily responsibility in project development.

DRAFTING

TEMPLATES

To access CADD template files

with predefined drafting

settings, go to the Student

Companion Website, select

Student Downloads,

Drafting Templates and then

select the appropriate

template file. The ASME-Inch

and ASME-Metric drafting

templates follow ASME, ISO,

and related mechanical drafting

standards. Drawing templates

include standard sheet sizes

and formats and a variety of

appropriate drawing settings

and content. You can also use

a utility such as the AutoCAD

DesignCenter to add content

from the drawing templates to

your own drawings and

templates. Consult with your

instructor to determine which

template drawing and drawing

content to use.

NOTE: Each problem assignment is given as an

engineering layout to help simulate actual real-

world drafting conditions. Problems become

more complex as you continue.

Dimensions and views on engineer layouts may not beplaced

in accordance with acceptable standards. You need to carefully re-

view this chapter and previous chapter contents when preparing

the layout sketch. In some problems, the engineer layout assumes

certain information, such as the symmetry of a part or the align-

ment of holes. You need to place enough dimensions or draw lines

between features to fully dimension each part. In addition, evaluate

proper tolerancing between mating components to make sure they

fit during assembly. For example, a 1-in. shaft does not always fit in

a 1-in. hole, depending on the tolerance applied to thefeatures.

Most of the Chapter 15, Working Drawings, problems can be

drawn without studying other chapters in this section. However,

several of the given problems are advanced and challenging and

are best solved after you study all Section Four chapters. If you

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BASIC THROUGH ADVANCED PROBLEMS

Part 1 : Problems 15.1 Through 15.22

PROBLEM 15.1 Working-drawing assembly (metric)

Assembly Name: Plumb Bob

SPECIFIC INSTRUCTIONS: Prepare a working-drawing assem-

bly that has a detail drawing of each part, an assembly drawing,

and a parts list on one sheet.

PARTS LIST

ITEM QTY NAME MATERIAL

1 1 PLUMB BOB BRONZE

2 1 CAP BRONZE

TWO PICTORIAL VIEWS OF

THE CAP ARE PROVIDED

FOR CLARITY

PROBLEM 15.2 Working drawing (in.)

Assembly Name: Hammer

SPECIFIC INSTRUCTIONS: Prepare a detail drawing for the

hammer head and two optional hammer handles on one sheet.

Make the assembly drawing and parts list on another sheet.

(a)

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(c)

PROBLEM 15.2

(Continued)

(b)

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PROBLEM 15.3 Working drawing (in.)

Assembly Name: Key Holder

SPECIFIC INSTRUCTIONS: Prepare a detail drawing for each

part, an assembly drawing, and a parts list on one sheet, unless

otherwise specified by your instructor.

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PROBLEM 15.4 Working drawing (in.)

Assembly Name: Lock Nut Wrench

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with all of the detail drawings on one sheet and the as-

sembly drawing and bill of materials on another sheet. Use mul-

tiview projection for view layout.

LOCK NUT WRENCH BILL OF MATERIALS

ITEM QTY DESCRIPTION

1 1 GRIP

2 1

STEEL RIVET, Ø .25 X .625 LONG

3 1 MAIN BODY

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PROBLEM 15.5 Working drawing (metric)

Assembly Name: C-clamp

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with all of the detail drawings on one sheet and the as-

sembly drawings and parts list on another sheet. Use multiview

projection for view layout.

PARTS LIST

ITEM QTY NAME MATERIAL

1 1 PIN CRMS

2 1 BODY SAE 4320

3 1 SCREW SAE 4320

4 1 SWIVEL SAE 1020

C-CLAMP

1 PIN

2 BODY

CHAMFER ALL CORNER 45˚ X 1.6

4 SWIVEL

3 SCREW

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PROBLEM 15.6 Working drawing (in.)

Assembly Name: Drill Pump

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with one detail drawing per sheet and the assembly

drawing and bill of materials on another sheet. Use multiview

projection for view layout.

DRILL PUMP BILL OF MATERIALS

ITEM QTY DESCRIPTION

1 1 PUMP HOUSING

2 1

.070 O-RING, Ø 2.00

3 1 SEAL

4 1 PLASTIC BUSHING

5 1 SHAFT

6 1 PADDLE WHEEL

7 1 COVER

8 3 1/8” X 5/8” LONG PAN HEAD SCREW, THREAD CUTTING

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PROBLEM 15.7 Working drawing (in.)

Assembly Name: Mill Work Stop

SPECIFIC INSTRUCTIONS: This problem has basic applications.

However, there is a welding symbol involved in the assembly. You

should study welding processes and representations covered in

Chapter 18 before completing this problem.

Prepare a complete set of working drawings with one detail

drawing per sheet and the assembly drawing with parts list on

one sheet. Notice that part number 10, TEE STUD, is cut from

standard 3/8-16UNC ALL THREAD. Parts 12 and 13, BLANK

KNOBS, are purchased as knobs without the threads machined.

You will draw the knobs as a representation of the purchase part

and give the thread note as identified in the parts list. The actual

dimensions of the knob to be purchased are not important. How-

ever, accurate specifications for the threads to be machined into

the purchase part are important. Note: Some design is required

throughout the completion of the project.

PARTS LIST

ITEM QTY NAME DESCRIPTION MATERIAL

1 1 VERTICAL MEMBER 3/4 3 2 3 4 SAE 6061

2 1 BASE MEMBER 1 3 2 3 3.5 SAE 6061

3 2 RIB 1/4 PLATE SAE 6061

4 1 ARM 3/8 3 1 3 5-1/2 SAE 1018

5 1 CLAMP 1/2 3 1 3 1-5/16 SAE 1018

6 1 TEE PLATE DRILL AND

TAP AT CENTER FOR

5/16-18UNC-2 THREAD THRU

5/16 3 1 3 1-1/4 SAE 1018

7 1 STOP ROD Ø5/16 3 6 SAE 303 SS

8 1 WING NUT 1/4-28 3 1/2

9 1 BUSHING Ø1/2 3 .31 SAE 1018

10 1 TEE STUD 3/8-16 3 2 LG ALL THREAD

11 1 CARRIAGE BOLT 5/16-18UNC-2

12 21 BLANK KNOB VLIER HK-3 (DRILL AND

TAP FOR 3/8-16UNC-2B)

13 1 BLANK KNOB VLIER HK-3

(DRILL AND TAP FOR

5/16-18UNC-2B)

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PROBLEM 15.7

(Continued)

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PROBLEM 15.8 Working drawing (in.)

Assembly Name: Fly Tying Vise

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with one detail drawing per sheet and the assembly

PARTS LIST

and parts list on another sheet. When preparing the assembly

drawing, use separate balloons for each part in each view or use

only one balloon in the view that most clearly identifies the part.

Problem Courtesy of David P. Madsen and John Melloy.

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PROBLEM 15.8

(Continued)

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PROBLEM 15.9 Working drawing (in.)

Assembly Name: Cork Screw

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with one detail drawing per sheet and the assembly

and parts list on another sheet. When preparing the assembly

drawing, use separate balloons for each part in each view or use

only one balloon in the view that most clearly identifies the part.

Establish tolerances between mating parts. Determine the di-

mensions for the Pin, Part 6 and create needed detail or purchase

part specifications. Errors are likely in this problem. Identify and

correct errors as discussed in the general problem instructions

in this chapter. Verify dimensions during assembly. Establish

tolerances between mating parts.

PARTS LIST

ITEM QTY NAME MATERIAL

1 1 BODY Stainless Steel

2 1 HANDLE Stainless Steel

3 2 ARM Stainless Steel

4 2 UPPER PIN Stainless Steel

5 2 LOWER PIN Stainless Steel

6 1 PIN Stainless Steel

7 1 CORK SCREW Stainless Steel

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PROBLEM 15.10 Working drawing (in.)

Assembly Name: Ball Valve

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with one detail drawing per sheet and the assembly

and parts list on another sheet. When preparing the assembly

drawing, use separate balloons for each part in each view or use

.1295

.1290

.600

.1300

.1295

.500

.595

.300

.295

5 1 STEM STAINLESS STEEL 1DT1005

4 1 WASHER PLASTIC 1DT1004

3 2 O-RING PARKER #2-008 5DT1003

2 1 HANDLE STAINLESS STEEL 1DT1002

1 1 NUT 5/16-24UNF-2 5DT1001

KEY QTY NAME MATERIAL PART NO.

PARTS LIST

BODY

10 1 END CAP BRASS 1DT1010

9 1 BALL STAINLESS STEEL 1DT1009

8 2 WASHER PLASTIC 1DT1008

7 1 VALVE BRASS 1DT1007

6 1 WASHER PLASTIC 1DT1006

only one balloon in the view that most clearly identifies the part.

This is a prototype project. Errors are likely in this problem. Iden-

tify and correct errors as discussed in the general problem in-

structions in this chapter. Verify dimensions during assembly.

Establish tolerances between mating parts.

PROBLEM 15.9

(Continued)

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PROBLEM 15.10

(Continued)

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PROBLEM 15.11 Working drawing (metric)

Assembly Name: Tool Holder

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with one detail drawing per sheet and the assembly

and parts list on another sheet. When preparing the assembly

drawing, use separate balloons for each part in each view or use

only one balloon in the view that most clearly identifies the part.

PARTS LIST

ITEM QTY NAME Material

1 1 PARTING TOOL,

3/32 IN 3 1/2 IN

PURCHASE PART

TOOL STEEL

2 1 TOOL HOLDER BODY 06 STEEL

3 1 ADJUSTMENT SCREW SAE 1035 STEEL

4 1 SHIM SAE 4320 STEEL

5 1 KNURL NUT SAE 3130 STEEL

6 1 WASHER SAE 1060 STEEL

7 1 STUD SAE 1035 STEEL

81 M 10 3 1.5 HEX NUT

PURCHASE PART

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PROBLEM 15.12 Working drawing (in.)

Assembly Name: Adjustable Attachment

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with detail drawings of individual parts combined on

one or more sheets, depending on the size of sheet selected. The

assembly drawing and parts list is combined on one sheet.

PARTS LIST

ITEM QTY NAME DESCRIPTION MATERIAL

1 1 CAP SCREW .25-20UNC-2 3

.75 HEX SOC

HEAD

STL

2 1 FRAME SAE 4340

3 1 ADJUSTING SAE1045

SCREW

4 1 SET SCREW 8-32UNC-2

HEX SOC FLAT

POINT

STL

5 1 TAPER PIN 0 3 .625 STL

6 1 KNURL KNOB SAE 1024

7 1 CLAMP SCREW SAE 2330

8 1 PILOT SCREW SAE 2330

9 1 ADJUSTING NUT SAE 3130

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PROBLEM 15.12

(Continued)

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PROBLEM 15.13 Working drawing (in.)

Assembly Name: Precision Vise

SPECIFIC INSTRUCTIONS: Prepare a complete set of working

drawings with one detail drawing per sheet and the assembly

drawing and bill of materials on another sheet. Use multiview

projection for view layout.

PARTS LIST

ITEM QTY NAME DESCRIPTION MATERIAL

1 1 BASE SAE 1040

2 1 BALL WASHER SAE 1040

3 1 NUT SAE 1040

4 1 CAP SCREW

5/16-24NF 3 1

1/2 HEX

SOCKET HEAD

STL

5 1 JAW SAE 1040

6 1 JAW INSERT SAE 4330

7 2 MACH SCREW

1/4-28NF 3 1/2

FLAT HD

STL

8 2 CAP SCREW

1/4-28NF 3 3/4

HEX SOCKET

HEAD

STL

9 1 JAW INSERT SAE 4330

TWO SURFACES

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PROBLEM 15.13

(Continued)

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