INTERPRET TECHNICAL DRAWING AND PLANS

A medium line used to show edges and contours visible to the eye.

• A. Border Line

• B. Dimension Line

• C. Reference Line

Very light line used to “block in” an object. These lines are made so light that little or no erasing is needed. They serve as base for darkening in the permanent line.

• A. Border Line

• B. Dimension Line

• C. Reference Line

A light line used as axis of symmetry.

• A. Border Line

• B. Dimension Line

• C. Projection Line

Light thin lines used to show the sizes of the object. Extension lights start about 1/16” from visible or object line. The dimension line is broken near the center for the dimension.

• A. Center Line

• B. Projection Line

• C. Reference Line

Wavy line draws freehand for the same purpose as long break.

• A. Border Line

• B. Dimension Line

• C. Hidden/Visible Line