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Basic Dimensioning Practices

Basic Dimensioning Practices. Sacramento City College EDT 310. Dimensioning Practices. Dimensional information includes Size dimensions. Location dimensions. Notes. Dimensioning Practices. Size Dimensions Size dimensions provide the size of physical features. Diameter of holes Width

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Basic Dimensioning Practices

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  1. Basic Dimensioning Practices Sacramento City College EDT 310 EDT 310 - Chapter 18 - Basic Dimensioning Practices

  2. Dimensioning Practices • Dimensional information includes • Size dimensions. • Location dimensions. • Notes. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  3. Dimensioning Practices • Size Dimensions • Size dimensions provide the size of physical features. • Diameter of holes • Width • Length • Depth EDT 310 - Chapter 18 - Basic Dimensioning Practices

  4. Dimensioning Practices • Location Dimensions • Location dimensions provide the location of physical features. • Location of holes from end • Datum Dimensioning • Chain Dimensioning • Location of windows/doors in buildings EDT 310 - Chapter 18 - Basic Dimensioning Practices

  5. Dimensioning Practices • Notes • Notes give information about individual or specific features on the drawing. • They are attached to the feature with a leader line. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  6. Dimensions • Each drafting field uses a different type of dimensioning technique • Architectural. • Mechanical. • Civil. • Electronics. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  7. Dimensions • Drafters should place dimensions in accordance with company and industrystandards. • Use the company standard FIRST. • When no company standard exists, use industrystandards. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  8. Dimensioning Standards • ASME Y-14.5M-1994 Dimensioning and Tolerancing • Standard emphasized in the textbook. • M - means metric. • 1994 is the year it was published. • ASME is the American Society of Mechanical Engineers. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  9. Dimensioning Formats EDT 310 - Chapter 18 - Basic Dimensioning Practices

  10. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  11. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  12. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  13. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  14. Dimensioning Formats • Unidirectional Dimensioning is • “Unidirectional” means one direction. • All dimension numbers and notes are placed horizontally on the drawing sheet. • Numbers are read from left to right when viewed from the bottom of the drawing sheet. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  15. Aligned Dimensioning • Aligned Dimensioning is • Used on architectural drawings. • Horizontal dimensions are read horizontally. • Vertical dimensions are read vertically from the right edge of the sheet. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  16. Dimension Styles used by Particular Field of Work EDT 310 - Chapter 18 - Basic Dimensioning Practices

  17. Dimensions • Mechanical Field. • Uses Unidirectional dimensioning • Dimensioning parts. • Dimension Characteristics • Uses arrowheads for terminators. • Dimension line is broken • Dimension number is centered inside dimension line. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  18. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  19. Dimensions • Architectural Field. • Uses Aligned dimensioning • Dimension Characteristics • Uses “tic” marks for terminators. • Dimension line is unbroken. • Dimension number is centered over dimension line. • Dimension is aligned with surface. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  20. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  21. Dimensioning Practices EDT 310 - Chapter 18 - Basic Dimensioning Practices

  22. Dimensioning Practices • Dimensioning practices depend on • Product requirements. • What are you making? • Manufacturing accuracy. • Extreme precision vs approximate dimensions. • Standards. • What dimension standards exist for your industry? • Tradition. • How has your industry dimensioned in the past? EDT 310 - Chapter 18 - Basic Dimensioning Practices

  23. Dimensioning Practices • Compare dimensioning practices for: • Automobile. (decimal inches) • Architecture. (feet, inches, fractions of inch) • Microprocessor chip. (1/10,000 to 1/100,000 of an inch • Civil. (Miles or kilometers) • Each dimension type is appropriate for that discipline. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  24. Dimensioning Practices • Precision is indicated by decimal places • Automobile. (decimal inches) • 3 inches vs 3.0010 inches • Architecture. • 40.343245 feet (???) !! • Civil. • 40.365789 miles (???) !! • Precision must be appropriate for that discipline. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  25. Dimensioning Practices • The number of decimal places shown on a dimension increases manufacturing costs! • Paper weight measurements • 3.0000” x 4.0000” x 2.0000” • Vs • 3” x 4” x 2” EDT 310 - Chapter 18 - Basic Dimensioning Practices

  26. AutoCAD Dimensioning Commands EDT 310 - Chapter 18 - Basic Dimensioning Practices

  27. DLI DIMLINEAR DAL DIMALIGNED DAN DIMANGULAR DBA DIMBASELINE DCE DIMCENTER DCO DIMCONTINUE DED DIMEDIT DRA DIMRADIUS DDI DIMDIAMETER DOR DIMORDINATE DOV DIMOVERRIDE DST DIMSTYLE LE LEADER Dimensioning Commands EDT 310 - Chapter 18 - Basic Dimensioning Practices

  28. The DIMLINEAR Command EDT 310 - Chapter 18 - Basic Dimensioning Practices

  29. DIMLINEAR Command • Use DIMLINEAR command for • Length • Width • Depth • Use DIMLINEAR for • Linear dimensions – (X,Y, Z) • Horizontal • Vertical • Slanted surfaces EDT 310 - Chapter 18 - Basic Dimensioning Practices

  30. DIMLINEAR Command • All dimension components are placed automatically by AutoCAD. • Extension lines. • Dimension lines. • Dimension text and arrowheads. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  31. DIMLINEAR Command • To DIMLINEAR command: • Pick the LinearDimensionbutton on the Dimension toolbar. • OR • Pick Linear from the Dimension pull-down menu. • OR • Type DLI or DIMLINEAR at the Command: prompt. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  32. DIMLINEAR Command • Command Sequence: Command: DLI or DIMLINEAR Pick First extension line origin. Pick Second extension line origin. Pick Location of dimension. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  33. First Extension Point EDT 310 - Chapter 18 - Basic Dimensioning Practices

  34. Second Extension Point EDT 310 - Chapter 18 - Basic Dimensioning Practices

  35. Dimension Location EDT 310 - Chapter 18 - Basic Dimensioning Practices

  36. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  37. DIMLINEAR Command • When picking extension line origins: • Use one of the OSNAP modes for accuracy. • ENDpoint is a good one to use. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  38. DIMLINEAR Command • The DIMLINEAR command allows you to generate dimensions that are • Horizontal. • Vertical. • Aligned with a slanted surface. • Rotated at a specified angle. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  39. DIMLINEAR Command • Command: DIMLINEAR • The following prompt appears: Dimension line location (Mtext/Text/Angle/Horizontal Vertical/Rotated) • Notice submenu choices • Mtext • Text • Angle • Horizontal • Vertical • Rotated EDT 310 - Chapter 18 - Basic Dimensioning Practices

  40. DIMLINEAR Command • Dimension line location • Is the default option selection. • Click the location where you want the dimension line. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  41. DIMLINEAR Command • Mtext • Accesses the Multiline Text Editor. • The << >> (Chevrons) indicate the current dimension value. • The < > is an intelligent value. • Normally, you should NOT delete the < >. • If you want the dimension changed, delete < >. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  42. MTEXT Option EDT 310 - Chapter 18 - Basic Dimensioning Practices

  43. DIMLINEAR Command • Text (Uses DTEXT) • Uses the Command Line to change the dimension text. • Angle • Allows you to change the dimension text angle. • Horizontal • Sets dimensions to horizontal distances only. • Vertical • Sets dimensions to vertical distances only. • Rotated • Allows you to change the angle for dimension line. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  44. Text Option chosen EDT 310 - Chapter 18 - Basic Dimensioning Practices

  45. Angle EDT 310 - Chapter 18 - Basic Dimensioning Practices

  46. Vertical Horizontal EDT 310 - Chapter 18 - Basic Dimensioning Practices

  47. Rotated EDT 310 - Chapter 18 - Basic Dimensioning Practices

  48. The DIMALIGNED Command EDT 310 - Chapter 18 - Basic Dimensioning Practices

  49. Dimensioning Angled Surfaces • DIMALIGNED • Use for dimensioning a surface drawn at an angle. • DIMALIGNED • functions similarly to the DIMLINEAR command • aligns dimension lines with the surface. EDT 310 - Chapter 18 - Basic Dimensioning Practices

  50. EDT 310 - Chapter 18 - Basic Dimensioning Practices

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