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Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Bruce Mayer, PELicensed Electrical & Mechanical Engineer

[email protected]

Engineering 22

WorkingWorkingDrawings-Drawings-

22



Standard BordersStandard Borders

Almost All Engineering Firms Have Some Standard/Default Elements That are Included in all Engineering Drawings

These Elements are incorporated into Standard “Borders & Title-Blocks”• When you First Go to Work for a Design

Firm find the standard “Border” or “Frame” and make sure you understand the meanings of the all the elements



Example of Std BorderExample of Std Border

RememberThis?



Anatomy of a Working DwgAnatomy of a Working DwgRev. Block

Note Block

Zone No.

Zone Ltr.

On-Dwg BoM

Title BlockFOIA Disclaimer

Note Indicator

BoM BallTag



Anatomy of a Working DwgAnatomy of a Working Dwg

Section/View Line

Zone Block

Detail Bubble

Separate-SheetParts List



Anatomy of a Title BlockAnatomy of a Title Block

Drawing Title Block Release Block

Tolerance Block

Matl-Spec Block

BoM Table Headings Company ID Block

Drawing Number Revision Level Dwg Sheet Size Dwg Scale

Dwg Sheet: No. & Cnt Co. Division ID



Zoning & RevingZoning & Reving

Zone 7B (or B7)



Notes & Comments - 1Notes & Comments - 1

Revisions Must be Carefully Documented; Especially if they affect• Form (physical Shape)

• Fit (mounting, or interface locations)

• Function (how it works)

Zoning on Sections & Details is Optional for 1 or 2 sheet drawings

Rev’s should be Zoned UnLess meaning is “obvious”



Notes & Comments - 2Notes & Comments - 2

Show Parts & Assemblies in their most “Natural” Position as implied by function or Mounting

Part Number Formats Vary Widely• Watkins-Johnson Co. →

– 967852 or 984377-003

• Olympus Japan → SS0251E0

• Dawn VME → 11-1011310-12



Drawing SCALE InterpretationDrawing SCALE Interpretation

Typical Scale CallOut

SCALE 1:16Length On DRAWING

Length in REAL WORLD

• Example: Length In REAL WORLD = 73.75”

DWGRW

DWGRW in

in

inin 61.4

16

175.73



Architect/CE Scale ExampleArchitect/CE Scale Example

Recall Scale Definition

YX Size on DRAWING

Size in REAL WORLD

Example - Given Scale: 2” = 1’-0”• Drawing Size → Scaling UP Find

"DWG6

"RW

'RW 03



mm Scale Examplemm Scale Example

A Scale DOWN Example• Given Scale: 1mm = 30mm

• Use TAPE MEASURE to Determine Real World Size = 6810 mm (22.34 ft)

Calculate Length of this Line on DWG

DWGRW

DWGRWDWG mm

mm

mmmmL 227

30

16810

RW

DWGRWDWG mm

mmLL



Drawing SCALE AlternativeDrawing SCALE Alternative

Some Other Common Scale CallOuts

SCALE 1=10 or SCALE 1/4

Length in REAL WORLD

Length On DRAWING

Watkins-Johnson Olympus



The Std Chabot Engr Dwg FrameThe Std Chabot Engr Dwg Frame



Using The Drawing FrameUsing The Drawing Frame

The Chabot Engineering Drawing Frame Should be used for Formal Engineering Drawings

The FRAME should be SCALED Up or Down to fit the FULL SCALE Object• i.e., the OBJECT is

Drawn at 1:1, then the Frame-Border is adjusted to fit



1st vs. 3rd Angle Projection1st vs. 3rd Angle Projection

Projection Box 1st-Ang. Note Front Surface is Projected BACKWARDS

1st Ang Proj

Front V Lside V

Top V

1st Angle (Europe)

Frontal PlnFront V.

Profile PlnLside V.

Horizontal PlnTop V.

Horizontal PlnTop V.

Profile PlnLside V.

Frontal PlnFront V.

3rd AngleUSA, Asia



11StSt Angle Projection Angle Projection

The USA Conventionally Uses the So-Called “THIRD” Angle Projection Produced by Unfolding the “Glass Box”

The European “FIRST” Angle Convention Essentially Projects the SHADOW of An Object Projected Onto a Screen BEHIND it.

The 3rd Angle (USA type) Technique is Much More Intuititive



1st Angle Projection1st Angle Projection

Note• Rearward Projectors

• “Opposite” Positioning of the Views



Who’s on First, I-Don’t-Know’s Who’s on First, I-Don’t-Know’s On Third (c.f. Abott & Costello)On Third (c.f. Abott & Costello)

“Third Angle Projection” Symbol Appears in Almost all Dwg Title Blocks

FIR

ST

An

gle

Pro

jT

HIR

D A

ng

le Pro

j



11stst & 3 & 3rdrd Angles Summarized Angles Summarized

In FIRST-ANGLE projection, each view of the object is projected in the direction (sense) of sight of the object, onto the interior walls of the box

In THIRD-ANGLE projection, each view of the object is projected opposite to the direction (sense) of sight, onto the (transparent) exterior walls of the box



All Done for TodayAll Done for Today

ProjectionQuadrantsReVealed



Bruce Mayer, PELicensed Electrical & Mechanical Engineer

[email protected]

Engr/Math/Physics 25

AppendiAppendixx

6972 23 xxxxf



Using Std Frame Demo - 1 Using Std Frame Demo - 1 1. Open Title Block

• Chabot_TitleBlock_D_BMayer_050909.DWG

2. Save Std Border as• 987654-

321_Weld_Assy.DWG

3. Open Design File• Example_Insert_int

o_Dwg-Border_90661201.DWG

4. Zoom Out 0.3x5. Make Rectangle

around object6. EyeBall to see if

HEIGHT or WIDTH will be Frame Scaling Factor• Choose WIDTH

6. Use DIST to Measure Rectangle Width at ≈ 91.5



Using Std Frame Demo - 2Using Std Frame Demo - 2

7. Zoom in On Border

8. Erase the Unneeded Objects & Notes• Leaves Clean

Border Template

9. Measure “Working (open) Width” of Border at ≈32

10.Calc ScaleUp MIN Factor at• 91.5/32 =2.86

11.Allow 10% on Each side for Working ScaleUp Factor• 2.86*1.2 = 3.43

• Use 3.5




12.ScaleUp Border by 3.5x using Bot-Rt pt with NODE opt

13.Move Rect & WeldFrame Block-Contents to Expanded Border

14.Erase Rectangle

15.Enter Object BoM into Frame Bom

• Note that Obj BoM is NOT Scaled Same as Broder

• This is a Good Reason for Putting BoM separate Sht

16.Copy (type) 4 items from Ylw BoM into Border BoM• Copy at least one

BoM Line




17.Fill In Title Block Using Double-Click to Activate AttEdit• p/n = 987654-321

• Scale: 1 = 3.5

18.Fill in Rev Block• Show Rev.0 as

initial Release per ECO 007536

19.Erase Unused Rev Lines

20.Move Border & Contents to 0,0• Use Lower-Lt Node



Demo ResultDemo Result



A Cool AssyA Cool Assy

[email protected] engr-22_lec-23_working_drawings-2.ppt 1 bruce mayer, pe engineering 22 –...

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