Lesson 2: The Alphabet of Lines
Duration of Days: 3
Lesson Objective
Students will identify and replicate standard line types according to ANSI/ASME standards used in CT industry.
What happens if a contractor mistakes a hidden line for an object line?
How do line weights change the "readability" of a technical drawing?
Object Line, Hidden Line, Center Line, Phantom Line, Construction Line, Line Weight.
CT CADD.02: Demonstrate the use of common drawing/measuring instruments.
CT CTE.AR-D.1.1: Identify and use proper line types and line weights.
Students learn the "Alphabet of Lines." They will practice manual line-work, focusing on "weight" (lightness/darkness) to convey different parts of an object.
Purpose: To master the visual grammar essential for orthographic projection.
DOK Level: 1 (Recall and Reproduction).
Provide "traceable" sheets with varying line types; use tactile "raised line" samples to demonstrate thickness differences.
"Line ID Quiz" where students label line types on a professional-grade mechanical drawing.
2H and 4B pencils, straightedges, and the Alphabet of Lines reference guide.