Standard Drafting Practices

Points, Lines, and Planes

Lettering

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

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.

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.

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.

Reference Lines and Fold Lines

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

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.

True Length Lines

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

TL

True Size Planes

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

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.

CAD Drawings

Description Layer Name Color Linetype LineweightCenter Lines Center Lines White (7) Continuous Default 0.010Construction lines Construction 252 Continuous Default 0.010Fold Lines Fold Lines 252 Continuous Default 0.010Hidden Lines Hidden Lines White (7) Hidden2 Default 0.010Object lines Object Lines White (7) Continuous 0.020Text/Dimension Text White (7) Continuous Default 0.010Title 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.