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Basic Drafting Skills

Basic Drafting Skills

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Basic Drafting Skills

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  1. Basic Drafting Skills 003.03 Demonstrate correct drawing procedures

  2. Aligning & Taping Paper • Align paper on parallel edge (or T-square) • Fasten top two corners with strips of drafting tape • Lower parallel edge (or T-square) and fasten bottom two corners with strips of drafting tape

  3. Drawing Lines • Use parallel edge (or T-square) to draw horizontal lines • Lean pencil at about 60° • Use triangles to draw vertical and inclined lines

  4. 90° VERTICAL 30° 60° 60° 30° 15° 45° 75° 45° 75° 15° HORIZONTAL 0° HORIZONTAL 0° Drawing Lines at Standard Angles

  5. B A REQ’D LINE Drawing Parallel Lines • Move parallel edge (or T-square) and triangle to line up with given line AB • With parallel edge (or T-square) held firmly in place, slide triangle into position and draw required line

  6. B A REQ’D LINE Drawing Perpendicular Lines • Move parallel edge (or T-square) and triangle until a side of the triangle lines up with the given line AB • With parallel edge (or T-square) held firmly in place, reposition triangle across line and draw required line

  7. 11.00 .38 10.25 .38 .50 8.50 7.63 TITLE BLOCK AREA .38 Drawing the Border Recommended layout for A size sheet

  8. 3.88 2.38 .38 COMPANY NAME AND ADDRESS INFORMATION RELATED TITLE TO PREPARATION OF DRAWING INCLUDES 2.00 NAME OF DRAFTER, ENGINEER, CHECKER, 1.38 ISSUE DATE, ETC. CAGE CODE DWG NO. REV SIZE .63 SCALE SHEET .25 1.75 3.25 4.25 6.25 Drawing the Title Block • Title block contains information such as drafter, date, and scale • Dimensions shown are recommended and may be varied to accommodate the user’s requirements

  9. 1.75 1.75 1.75 1.75 1.50 3.00 5.50 8.75 Centering a Single View Drawing

  10. 2.75 4.38 4.38 2.75 Centering a Single View Drawing Step 1

  11. 1.75 1.75 1.75 1.75 1.50 3.00 Centering a Single View Drawing Step 2

  12. Centering a Single View Drawing Step 3

  13. Centering a Single View Drawing Step 4

  14. Scale Drawings • Measurements can be full size or in some exact proportion to full size • Triangular scales are typically used to allow for more scales per stick • Scales are noted on drawings as • Drawn units = actual units • Drawn units : actual units

  15. 3 1 2 1 16 2 16 1 1 16 4 8 2 0 1 1 Reading a Mechanical Scale FRACTIONAL INCH SCALE (FULL SIZE)

  16. 1 1 7 2 1 3 1 8 4 2 2 42 44 40 3 2 1 0 Reading a Mechanical Scale FRACTIONAL INCH SCALE (HALF SIZE)

  17. .74 1.12 1.50 2 4 6 8 2 4 6 50 (.02) 0 1 Reading a Decimal Scale DECIMAL INCH SCALE (FULL SIZE)

  18. 1.70 .50 3.20 5.90 HALF SIZE 0 1 2 3 4 5 6 7 8 Reading a Decimal Scale DECIMAL INCH SCALE (HALF SIZE)

  19. mm 1:1 0 10 20 30 40 50 60 70 80 6 24 42 66 Reading a Metric Scale 1:1 SCALE (1mm DIVISIONS)

  20. 2 28 62 110 mm 1:2 160 20 60 80 100 120 140 0 40 Reading a Metric Scale HALF SCALE (2mm DIVISIONS)

  21. 43° Measuring Angles w/ a Protractor • Angles are measured in units called degrees • A circle is divided into 360 parts (360°) • Each part is 1° • An angle of 43° is measured with a protractor

  22. Alphabet of Lines • Construction lines • Thin and light • .020” (0.5mm) • Hard lead (4H) • Visible lines • Thick and dark • .028” (0.7mm) • Softer lead (F or HB)

  23. .125" .0625" Alphabet of Lines • Hidden lines • Thin and dark • .020” (0.5mm) • Softer lead (F or HB) • .125” (3mm) long dashes w/ .030” (1mm) spaces in between

  24. .125" .75" - 1.5" .0625" Alphabet of Lines • Center Lines • Thin and dark • .020” (3mm) • Softer lead (F or HB) • .125” (0.5mm) dash in center w/ .030” (0.1mm) spaces between longer lines

  25. Alphabet of Lines • Dimension, Extension, Leader Lines • Thin and dark • .020” (0.5mm) • Softer lead (F or HB) 6.125”

  26. Alphabet of Lines

  27. Single View Drawing Assignment