Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu

1. Engineering 22 DimensioningPart-2 Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

2. Chp.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

3. AutoCAD 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

4. Invoke ACAD Dimensioning • Turn on the Dimensioning ToolBar • Use the PullDown Menu • Type in Using Command Line • dimlinear • dimdiameter • dimradius • dimbaseline • dimcontinue • dimordinate

5. Time For Live Demo Live Dimension Demo • Let’s Dimension some simple parts • DimLine Example • BaseLine (Ordinate)Example

6. 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 Dimension Styles - 1 • The Dims are OUT of PROPORTION Relative to Object

7. Fix this Lack of ProPortion Using a Dimension Style Estimate that Arrows & Text are about 4X too Large Adjust overall Proportions by Dimension Styles – 2 • Activates the DimStyle Dialog Box • New Layer at ¼-Scale & 3-Decimals

8. After Clicking New... Name the New “Style” “_25X-3Plcs” Dimension Styles – 2 • Clicking Continue→ Automatically Directed to “Fit” Tab • New Layer at ¼-Scale & 3-Decimals

9. Next Select “Primary Units” Tab Dimension Styles – 3 • Set “Unit Dimensions” Precision → 0.000 • Let’s Also Change the “Angle Dimensions” Precision → 0.0 (in degrees) • Click OK to accept Changes

10. Taken Back to Dim Style Mgr Dimension Styles – 4 • Select Style: “_25-3Plcs” • For this style “Set Current” • Click Close to Activate the _25-3Plcs Style • Now Use “Match Properties” to Fix Dims

11. Use DimLin to ADD a part-width Dimension Dimension Styles – 5 • Next, Pick the New-Dim, then Hit the MatchProp Tool • Note the New Dim 0.844

12. Click the OverSize Dims one-at-a-time with the MatchProp Paint Brush Dimension Styles – 6 • Click All Dims to Yield Too Far Not Between Ext Lines • Still Some Style Probs

13. Additional Style Fix Put Dim Between arrows When Possible Again Active Dim Style Mgr This Time Pick Modify Dimension Styles – 7 • Then Pick the Fit Tab

14. Under “Fit Options” Pick “Arrows” Dimension Styles – 8 • 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

15. The Modified Result Dimension Styles – 9 • 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

16. The Final Result of the Dim Style Management Dimension Styles – 10 • Looks Much Better

17. I Suggest that you spend some Time Exploring the Result of Dim Style Changes; e.g. Explore Dimension Styles • Can Now “Slide” the Dim-No. Location Lt-Rt or Up-Dwn

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

19. Caveat - 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

20. All Done for Today Be SUREto Read theAPPENDIX

21. Engr/Math/Physics 25 Appendix  Time For Live Demo Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

22. Open File DimLine_Dim_Example_016_Hinge_Spacer_0305_.DWG Strip Out Existing TitleBlk & Dims Turn off all Layers but DIM Set Snap to 0.1” DimLinear TopLeft-Corner to circle-ctr-line DimBaseline to complete width dims On Left-Edge Dim Ht to Hole (0.219) On Rt-Edge Dim Part Ht (0.437) DimLine Demo - 1

23. Make xline from 0.234 arrow On Side-V dim 0.09 thickness using nea to place arrows on xline Erase the xline From Rt-Circ make xline using @10,<-60 Leader to Circle Boundary, nea to xline Leader Text making Ø w/ %%c %%C0.219, 2X Use Mtext to make Note Light Break, All Sharp Edges DimLine Demo - 1

24. DimLine Demo – 3 (result)

25. Open File BaseLine_Dim_Example_009_Drv-Cage_Hinge-Retainer_0305_.DWG Strip Out Existing TitleBlk & Dims Turn off all Layers but DIM to delete dims Set Snap to 0.1” Call Fabricator and ask where the preferered Origin They Say UPPER-LEFT Make xLines that coincide with the TOP and Left Edges OrdDim Demo - 1

26. Move the User Coord System Origin to the intersection of the two xLines with the UCS command Use the NEW option Offset Left the vertical xLine by 1” For Y-Dims Invoke Ordinate Dimensioning with DimOrd Pick the top-Lt Chamfer, and move to offset xline Shows 0.000 as Dim Pick Lt end of Lt-C’Sink CtrLine OrdDim Demo - 2

27. Move Left to the offset xLine using the “per” option Sets Y-Dim to 0.375 Pick the Bot-Lt Chamfer, and move to offset xline using “per” option Sets Y-Dim to 0.750 Offset UpWard the Horiz. xLine by 1” Pick the Lt-Top Chamfer, and move to offset xline Shows 0.000 as Dim Pick Top end of Lt-C’Sink CtrLine OrdDim Demo - 3

28. Move Up to the offset xLine using the “per” option Sets X-Dim to 0.550 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 Make xLine with Lt-Vertical Edge Offset Lt xLine by 1.00” Use DimLin to “Arrow Dim” at xline Locations Height = 0.750 Thickness = 0.90 Next Add-Notes OrdDim Demo - 4

29. Make xLine at Bot-Edge Offset-Down xLine by 1.5” Make xLine at Rt-Bot Chamf using “mid” & @10<-45 Leader from Chamf. MidPoint to Xline @45° Leader Text = “CHAM 0.12 X 45°, 4X” Use “Alt248” to make degrees symbol (°) Make xLine from ctr of Lt-C’Sink with @10<-60 Leader from xLine and C’Sink intersection OrdDim Demo - 5

30. 2-Lines of Leader Text as %%C0.150 THRU, CSK %%C0.282 X 100°, 4X Offset-up Top-Edge xLine by 2” 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 OrdDim Demo - 6

31. OrdDim Demo - 7 • Just Before Erasing Construction Lines

32. OrdDim Demo - 9 • Erasing Construction Lines using Erase + Crossing

33. Insert Csink, Cbore, Depth Syms • 2X click dim boxes to activate MText dialog Box • Got to Symbol tool

34. Insert Csink, Cbore, Depth Syms • GoTo OTHER on PullDown Menu • Activates the Character Map with the current Font as default

35. Insert Csink, Cbore, Depth Syms • Pick AutoCAD’s GDT Font • Pick Select & Copy Symbol

36. Insert Csink, Cbore, Depth Syms • Paste Symbol into MText box that serves as text for the DimLeader

38. Counter-Drilled Holes

39. Counter-Sunk Holes

40. Counter-Bored Holes

41. Spot-Faced Holes

42. Threads & Knurls

43. Chamfers

44. 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 Abbreviations

45. 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 Abbreviations

46. 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 Abbreviations

47. 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 Abbreviations

48. 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 ASME Y1.1 Std Abbreviations