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Standard Drafting Practices

Standard Drafting Practices. Points, Lines, and Planes. Lettering. All points, lines, and planes should be labeled using 1/8" high letters with guidelines . Lines should be labeled at each end and planes at each corner. Either letters or numbers can be used for labeling. Points.

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Standard Drafting Practices

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  1. Standard Drafting Practices Points, Lines, and Planes

  2. Lettering All points, lines, and planes should be labeled using 1/8" high letters with guidelines. Lines should be labeled at each end and planes at each corner. Either letters or numbers can be used for labeling.

  3. Points Points in space should be indicated by two short dashes that are perpendicular to form a cross. Dots are never used to represent a point. Each dash should be approximately 1/8" long.

  4. Points on a line Points on a line should be indicated with a short perpendicular dash on the line. Dots are never used to represent a point on a line. Label the point with a letter or numeral.

  5. Construction lines and projection lines Projection lines are lines that are used in constructing the solution to a problem. Construction lines and projection lines are drawn as very thin, light lines. Construction lines should not be erased on descriptive geometry problems so that the drawing solutions can be checked and verified.

  6. Reference Lines and Fold Lines Reference lines and fold lines are thin black lines that are labeled in accordance with the textbook.

  7. Lines Object lines: Object lines used to represent points, lines, and planes should be drawn as thick, dense black lines. Hidden lines: Hidden lines are drawn as thin, dense black lines. Dashes in a hidden should be 1/8" long with a spacing of 1/16". Center lines: Center lines are drawn as thin, dense black lines.

  8. True Length Lines True length lines should be label by the full note TRUE LENGTH or by the abbreviation TL.

  9. True Size Planes True size planes should be labeled by the full note TRUE SIZE or by the abbreviation TS.

  10. Piercing Points and Visibility Piercing points are marked with a dash at the point of penetration. Piercing points are not labeled unless required in the directions for a specific problem or application. Visibility is shown using conventional hidden lines and visible object lines. Note that the hidden line rules for intersecting dashes is followed.

  11. CAD Drawings Description Layer Name Color Linetype Lineweight Center Lines Center Lines White (7) Continuous Default 0.010 Construction lines Construction 252 Continuous Default 0.010 Fold Lines Fold Lines 252 Continuous Default 0.010 Hidden Lines Hidden Lines White (7) Hidden2 Default 0.010 Object lines Object Lines White (7) Continuous 0.020 Text/Dimension Text White (7) Continuous Default 0.010 Title Block Title block White (7) Continuous Default 0.010 All drawing components should be placed on the appropriate layers. Set the Plot Style Table to Grayscale for plotting. Construction lines and fold lines should be plotted as light, thin lines.

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