Working Drawings-1 Engineering 22 Bruce Mayer, PE

Engineering 22

Working

Drawings-1

Bruce Mayer, PE

Registered Electrical & Mechanical Engineer

BMayer@ChabotCollege.edu

Engineering 22 – Engineering Design Graphics

1

Bruce Mayer, PE

BMayer@ChabotCollege.edu • ENGR-22_Lec-22_Working_Drawings.ppt

Skill-Development Goals

 Construct “Working Drawings” from the

Two Primary Components

• ASSEMBLY Drawing

• Parts List (a.k.a. Bill of Material, or BoM)

 Use AutoCAD to Insert and Scale

Up/Down a Standard Title Block to Fit the Assembly Drawing

 Place BoMs on the AutoCAD Title Block


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Bruce Mayer, PE


Working Drawings

 Defined → A final set of production drawings providing all of the necessary details and specifications needed to Fabricate and/or assemble a product or system.

 Three Main Parts

• Detail (Fabrication)

Drawings

• Assembly drawings

• Parts lists

 Reference Dwgs

• Layouts

– Fit & Function

• Schematics

– Electrical & Plumbing

• Concept Drawings

– 3D, Flow Charts, etc.


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Bruce Mayer, PE


Detail Drawings

 Show all necessary dimensioned views needed to make the part.

 Indicate material and tolerances.

 Indicate any finish treatments (plating, etc.) and requirements for surface-finish roughness.

 Detail drawings are not necessary for purchased parts, only for parts that will be manufactured to the Engineer’s design.

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 It is often preferred to show just one part per sheet so the same part drawing can be included in multiple assemblies without confusion.

Engineering 22 – Engineering Design Graphics Bruce Mayer, PE


Fabrication Drawing

TWO Parts on this Sheet



Poor form


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Bruce Mayer, PE


Fabrication Drawing


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Bruce Mayer, PE


Legal Interpretations

 A part manufactured to within specifications and per the Drawing MUST Be Purchased

 Parts can be rejected for not meeting any

ONE Specification of a Drawing-Feature

 Some Gray Areas

• Unreleased Drawings & Sketches

– Usually the ORIGINATOR Bears The Risk

 Typically Only Done in “Short-Run” Situations

• Originator vs. Receiver Interpretation

– Drawings and Specs Need to be PRECISE


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Bruce Mayer, PE


Assembly Drawings

 Can be exploded-isometric, sections, single views, exterior views, or assembled isometric drawings.

 Not usually dimensioned unless there are dimensions that are critical to maintain during assembly.

 Hidden lines not usually needed.


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Bruce Mayer, PE


Assembly Drawing


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Bruce Mayer, PE


Parts Lists (Bill of Materials)

 Parts list (a.k.a. “BoM”) on assembly drawings or combined assembly and detail drawings indicates part name, item number, material, and quantity required.

• Parts List May be on A Separate Document

– Reference in NOTES Section of the Dwg

 Often a company stock number is also included

 Part ID on Dwg

• Balltags on drawing indicate which part is being called out (next slide)

• Part No. may be Placed Directly on Drawing


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Bruce Mayer, PE


Ball-Tag BoM Assy Dwg

BallTag

Ref. to

Parts List


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Bruce Mayer, PE


Direct P/N Callout; No BallTags


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Bruce Mayer, PE


Direct P/N Callout; No BallTags


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Bruce Mayer, PE


Pictorial Assy w/ BallTags


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Bruce Mayer, PE


Ball-Tag Patent Drawing


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Bruce Mayer, PE


Separate Sheet Parts list

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No. Qty P/N Description

1. 4

2. 4

3. 4

4. 6

5. 1

181012566-BKOX

18-1000963

18-1000966

54-1013123

10-1013aaa

6. 1 10-1013bbb

7. TBD 18-1011336

M4 X 12, 90° FH SCREW, BLK OXIDE

No.8 split lock washer

No.8 flat washer

Fan, 40x40x20, 12Vdc

Bracket, Fan, Left

Bracket, Fan, Right

4.8x9.5 mm Self-Tapping Screw

8. 1

9. 1

10. 1

10-1013ccc

10-1013ddd

10-1013eee

11.

12. 1

10-1013fff

50-100gggg

13. A/R TBD

Spacer, Fan Bracket, Left

Bottom Pan

Top Plate

Bracket, Power Supply

PS, TurboCool, 300-1U-PFC

Side-plate insulating sheet

14. TBD 181012565-BKOX M3 X 10, 90° FH SCREW, BLK OXIDE

15. 1 52-1012988 SW, 2PDT, 15A

16. 1

17. 1

43-1005416

18-1006223

LED, GRN, 5 VDC

CLIP, LED, USE W/ 43-1005416

18. 1

19. 2

20. 2

21. 2

22.

18-1006223-01 COLLAR, LED, USE W/ 18-1006223

20-1011163-XX1 RAIL, HORIZ., FRONT, LEFT

20-1011163-XX2 RAIL, HORIZ., FRONT, RIGHT

20-1011164-XX1 RAIL, HORIZ., REAR, LEFT

20-1011164-XX2 RAIL, HORIZ., REAR, RIGHT

23.

24.

25.

2

1

2

26. 1

27. TBD

28. 2

20-1011165-XXX INSERT, THREADED, FRONT

06-1012975 BACKPLANE ASSY

20-1011199-XXX BRACKET SUPPORT, 1.678

TBD

TBD

18-10055333


STIFFENER, BACKPLANE

M4 Nut, Stainless Steel

M3x6 pan head screw

Bruce Mayer, PE


Hatch Patterns Indicate Parts


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 Different hatch patterns indicate which part is which in the assembly section.

 The material for the part can be identified by different hatch patterns.

 The hatch patterns run at different angles on different parts in the assembly

Bruce Mayer, PE


Thin Parts Filled In Black

 Thin parts like the gasket shown here are too small to hatch.

 Parts like these are filled in solidly with black.


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Bruce Mayer, PE


Cross-Section Layout

 Hatch Direction and/or Color Clearly

Distinguishes Different parts


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Bruce Mayer, PE


Reference Drawings

 Parts/Systems are Typically NOT

CONSTRUCTED to REFERENCE Drawings

 Ref Drawings are Created to Aid in the

Understanding of

• Fabrication

• Assembly

• Trouble-Shooting

• Maintenance

• Product Use


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Bruce Mayer, PE


Ref Drawings - Types

 Layout Drawings

• Used for Fit and Function

Understanding

 Schematics → Component Interconnect

• Used to Aid in Understanding of System

Function

• Classic Types

– Plumbing

– Electrical

• Many Other Types Exist


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Bruce Mayer, PE


Layout Dwg – Plumbing System


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Bruce Mayer, PE


Plumbing Schematic (For Layout)


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Bruce Mayer, PE


Electrical Schematic


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Bruce Mayer, PE


Combined Assy & Schematic


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Typically used in conjunction with a

LayOut Dwg

Bruce Mayer, PE


Mech Assy

Layout


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Bruce Mayer, PE


Use Instructions


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Bruce Mayer, PE


All Done for ToDay

Yet Another

Working

Dwg


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Bruce Mayer, PE


Engr/Math/Physics 25

Appendix



2 x

3 

7 x

2  x



6 f

Bruce Mayer, PE

Licensed Electrical & Mechanical Engineer

BMayer@ChabotCollege.edu


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Bruce Mayer, PE



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Bruce Mayer, PE


Working Drawings-1 Engineering 22 Bruce Mayer, PE

Engineering 22

Engr/Math/Physics 25

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Working Drawings-1 Engineering 22 Bruce Mayer, PE

Engineering 22

Engr/Math/Physics 25

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