[email protected] engr-22_lec-17_dimensioning-2.ppt 1 bruce mayer, pe engineering 22 –...

[email protected] • ENGR-22_Lec-17_Dimensioning-2.ppt1

Bruce Mayer, PE Engineering 22 – Engineering Design Graphics

Bruce Mayer, PELicensed Electrical & Mechanical Engineer

[email protected]

Engineering 22

DimensionDimensioninging

Part-2Part-2



Chp.8 Learning GoalsChp.8 Learning Goals

Apply Proper/Conventional Dimensioning Standards to Adequately Describe a Physical Object (e.g., a Machined Part) Such that It may be Properly Fabricated

Use AutoCAD to Dimension to Standards Orthographic Projections Views in Both Dimension-Line and BaseLine Forms



AutoCAD DimensioningAutoCAD Dimensioning AutoCAD does SEMI-AUTOMATIC

dimensioning• You select the features which should be

dimensioned and the location for each dimension

AutoCAD measures the distance in question and applies the appropriate dimension• Complete with arrowheads, extension

lines, and dimension lines



Invoke ACAD DimensioningInvoke ACAD Dimensioning

Turn on the Dimensioning ToolBar

Use the PullDown Menu

Type in Using Command Line dimlinear dimdiameter dimradius

dimbaseline dimcontinue dimordinate



Live Dimension DemoLive Dimension Demo

Let’s Dimension some simple parts

DimLine Example BaseLine (Ordinate)Example



Dimension Styles - 1 Dimension Styles - 1 Lets copy from the

DimLine example the Part-Drawing, but NOT The Dims Using• Dim Layer-Off

• Select-All & CopyClip

• Paste

Open New file using Acad.dwt

Then apply DimLines using DimLin to yield

The Dims are OUT of PROPORTION Relative to Object



Dimension Styles – 2 Dimension Styles – 2 Fix this Lack of

ProPortion Using a Dimension Style• Estimate that Arrows

& Text are about 4X too Large

Adjust overall Proportions by

New Layer at ¼-Scale & 3-Decimals

Activates the DimStyle Dialog Box



Dimension Styles – 2 Dimension Styles – 2 After Clicking New...

Name the New “Style” “_25X-3Plcs”

New Layer at ¼-Scale & 3-Decimals

Clicking Continue→ Automatically Directed to “Fit” Tab



Dimension Styles – 3 Dimension Styles – 3 Next Select “Primary

Units” Tab Set “Unit Dimensions”

Precision → 0.000

Let’s Also Change the “Angle Dimensions” Precision → 0.0 (in degrees)

Click OK to accept Changes



Dimension Styles – 4 Dimension Styles – 4 Taken Back to Dim

Style Mgr Select Style: “_25-

3Plcs” For this style “Set

Current”

Click Close to Activate the _25-3Plcs Style

Now Use “Match Properties” to Fix Dims



Dimension Styles – 5 Dimension Styles – 5 Use DimLin to ADD

a part-width Dimension

Next, Pick the New-Dim, then Hit the MatchProp Tool

Note the New Dim 0.844



Dimension Styles – 6 Dimension Styles – 6 Click the OverSize

Dims one-at-a-time with the MatchProp Paint Brush

Click All Dims to Yield

Still Some Style Probs

Too Far

Not Between Ext Lines



Dimension Styles – 7 Dimension Styles – 7 Additional Style Fix

• Put Dim Between arrows When Possible

Again Active Dim Style Mgr• This Time Pick

Modify

Then Pick the Fit Tab



Dimension Styles – 8Dimension Styles – 8 Under “Fit Options”

Pick “Arrows”

Click OK to Return to Dim Style Mgr

Click Close to Activate the Modifications to Style: “_25-3Plcs”

Find that The 0.219 Dim Fixed Automatically



Dimension Styles – 9 Dimension Styles – 9 The Modified Result The OverSize Spacing

on the BaseLined Width Dims is a LEFTOVER from the “Standard” Dim Style

Erase the Width Distances and Re-Dim with the Modified Style: “_25-3Plcs”

Fixed Automatically



Dimension Styles – 10Dimension Styles – 10 The Final Result of the Dim Style

Management

Looks Much Better



Explore Dimension Styles Explore Dimension Styles I Suggest that you

spend some Time Exploring the Result of Dim Style Changes; e.g.

Can Now “Slide” the Dim-No. Location Lt-Rt or Up-Dwn



Place Text Manually ResultPlace Text Manually Result Dim No. Slid to the Right in this case



Caveat - Dim StylesCaveat - Dim Styles

Dim Styles Have Frustrated The Instructor (me) for Years

Even with Extensive Hacking, I still get Unpleasantly Surprised by the Result From Dim Style Management



All Done for TodayAll Done for Today

Be SUREto Read theAPPENDIX

0.234

0.234

0.844

0.090

0.219

0.437



Bruce Mayer, PELicensed Electrical & Mechanical Engineer

[email protected]

Engr/Math/Physics 25

AppendiAppendixx

6972 23 xxxxf



DimLine Demo - 1 DimLine Demo - 1

1. Open File• DimLine_Dim_Exa

mple_016_Hinge_Spacer_0305_.DWG

2. Strip Out Existing TitleBlk & Dims• Turn off all Layers

but DIM

3. Set Snap to 0.1”

4. DimLinear• TopLeft-Corner to

circle-ctr-line

5. DimBaseline to complete width dims

6. On Left-Edge Dim Ht to Hole (0.219)

7. On Rt-Edge Dim Part Ht (0.437)



DimLine Demo - 1DimLine Demo - 1

8. Make xline from 0.234 arrow

9. On Side-V dim 0.09 thickness using nea to place arrows on xline

10.Erase the xline

11.From Rt-Circ make xline using @10,<-60

12.Leader to Circle Boundary, nea to xline

13.Leader Text making Ø w/ %%c• %%C0.219, 2X

14.Use Mtext to make Note• Light Break, All

Sharp Edges



DimLine Demo – 3 (result) DimLine Demo – 3 (result)



OrdDim Demo - 1 OrdDim Demo - 1

1. Open File• BaseLine_Dim_Exa

mple_009_Drv-Cage_Hinge-Retainer_0305_.DWG

2. Strip Out Existing TitleBlk & Dims• Turn off all Layers

but DIM to delete dims

3. Set Snap to 0.1”

4. Call Fabricator and ask where the preferered Origin• They Say UPPER-

LEFT

5. Make xLines that coincide with the TOP and Left Edges



OrdDim Demo - 2OrdDim Demo - 2

6. Move the User Coord System Origin to the intersection of the two xLines with the UCS command• Use the NEW

option

7. Offset Left the vertical xLine by 1”• For Y-Dims

8. Invoke Ordinate Dimensioning with DimOrd

9. Pick the top-Lt Chamfer, and move to offset xline• Shows 0.000 as

Dim

10.Pick Lt end of Lt-C’Sink CtrLine




11.Move Left to the offset xLine using the “per” option• Sets Y-Dim to

0.375

12.Pick the Bot-Lt Chamfer, and move to offset xline using “per” option• Sets Y-Dim to

0.750

13.Offset UpWard the Horiz. xLine by 1”

14.Pick the Lt-Top Chamfer, and move to offset xline• Shows 0.000 as

Dim

15.Pick Top end of Lt-C’Sink CtrLine



OrdDim Demo - 4 OrdDim Demo - 4 16.Move Up to the

offset xLine using the “per” option• Sets X-Dim to

0.550

17.Repeat 15 & 16 for C-Sinks and Rt Edge to Complete all the X-dims• 2.800, 5.800, 8.050• 8.600

Next Dim Side-V 18.Make xLine with Lt-

Vertical Edge19.Offset Lt xLine by

1.00”20.Use DimLin to

“Arrow Dim” at xline Locations• Height = 0.750• Thickness = 0.90

21.Next Add-Notes




22.Make xLine at Bot-Edge

23.Offset-Down xLine by 1.5”

24.Make xLine at Rt-Bot Chamf using “mid” & @10<-45

25.Leader from Chamf. MidPoint to Xline @45°

• Leader Text = “CHAM 0.12 X 45°, 4X”– Use “Alt248” to

make degrees symbol (°)

26.Make xLine from ctr of Lt-C’Sink with @10<-60

27.Leader from xLine and C’Sink intersection



OrdDim Demo - 6 OrdDim Demo - 6 • 2-Lines of Leader

Text as– %%C0.150 THRU,

CSK

– %%C0.282 X 100°, 4X

28.Offset-up Top-Edge xLine by 2”

29.Use Leader to Label Part-No. Box with Reference to Note-2

See Next Slide for Result BEFORE Stripping Out the xLines

Note: When Possible Use ASME Y1.1 Abbreviations• See List in

Appendix




Just Before Erasing Construction Lines




Erasing Construction Lines using Erase + Crossing



Insert Csink, Cbore, Depth SymsInsert Csink, Cbore, Depth Syms

2X click dim boxes to activate MText dialog Box

Got to Symbol tool




GoTo OTHER on PullDown Menu

Activates the Character Map with the current Font as default




Pick AutoCAD’s GDT Font

Pick Select & Copy Symbol




Paste Symbol into MText box that serves as text for the DimLeader



Counter-Drilled HolesCounter-Drilled Holes



Counter-Sunk HolesCounter-Sunk Holes



Counter-Bored HolesCounter-Bored Holes



Spot-Faced HolesSpot-Faced Holes



Threads & KnurlsThreads & Knurls



ChamfersChamfers



ASME Y1.1 Std AbbreviationsASME Y1.1 Std Abbreviations Alloy → ALY Aluminum → AL American Wire

Gage → AWG Assembly → ASSY Auxiliary → AUX Bevel → BEV Bill of Material →

B/M

Bolt Circle → BC Brass → BRS Broach → BRO Center Line → CL Chamfer → CHAM Circle → CIR Cold Drawn Steel →

CDS



ASME Y1.1 Std AbbreviationsASME Y1.1 Std Abbreviations Cold Rolled Steel →

CRS CounterBore →

CBORE CounterDrill →

CDRILL CounterPunch →

CPUNCH CounterSink → CSK

Degree → ° or DEG Design → DSGN Diameter → DIA Elevation → EL Engineer → ENGR Existing → EXIST. Flat Head → FH Gage or Gauge →

GA



ASME Y1.1 Std AbbreviationsASME Y1.1 Std Abbreviations Hardware → HDW Hot Rolled Steel →

HRS Inch → “ or IN Inside Diameter →

ID Keyway → KWY Laminate → LAM Material → MATL

Maximum → MAX Millimeter → MM Minimum → MIN Mounting → MTG National → NATL North → N Number → NO. Obsolete → OBS



ASME Y1.1 Std AbbreviationsASME Y1.1 Std Abbreviations Outside Diameter →

OD OverAll → OA Point → PT Polish → POL Pound → LB Pounds per Sq-Inch

→ PSI Push Button → PB

Radius → R Required → REQD Room Mean Square

→ RMS Round → RD Screw → SCR Sheet → SH Spot Face → SF Steel → STL



ASME Y1.1 Std AbbreviationsASME Y1.1 Std Abbreviations Structural → STR Taper → TPR Thick → THK Thread → THD Through → THRU Tolerance → TOL Typical → TYP Versus → VS Volume → VOL

Washer → WASH. Week → WK Wrought → WRT Yard → YD

Feet → ‘ or FT Mile → MI

[email protected] engr-22_lec-17_dimensioning-2.ppt 1 bruce mayer, pe engineering 22 –...

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