Understanding Line Symbols in Technical Drawings: A Guide to the Alphabet of Lines, Study notes of Communication and Presentation Skills

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Basic Drafting Skills

Alphabet of Lines

003.03 Identify line symbols

003.03 identify line symbols 0 Alphabet of Lines-Introduction o lines and line symbols used on drawings o drawings are easier to read o good contrast among different line symbols o generally two line widths: thick or thin o all lines are uniform, sharp and black

003.03 identify line symbols 0 Alphabet of Lines o used to show edges of an object o are thick and dark Visible/Object Lines

HEX BOLT 11

SECTION A-A

A 4

A

8

Identify the Number(s) of Object/Visible Line Symbol

HEX BOLT 11

SECTION A-A

A 4

A

8

Identify the Number(s) of Hidden Line Symbol

003.03 identify line symbols 0 Alphabet of Lines o used to show centers of round objects (arc & circles) o thin, long and short dashes Center Lines

003.03 identify line symbols 0 Alphabet of Lines-Summary The alphabet of lines are thick and thin line symbols used on drawings that form a kind of graphic alphabet. Each line and line symbol has a special meaning.