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Basic Drafting Skills
Alphabet of Lines003.03 Identify line symbols
003.03 identify line symbols 0
Alphabet of Lines-Introduction
o lines and line symbols used on drawingso drawings are easier to reado good contrast among different line symbolso generally two line widths: thick or thino all lines are uniform, sharp and black
1. Phantom 2. Section 3. Hidden 4. Cutting/Viewing5. Leader 6. Hidden 7. Center 8. Visible/Object9. Extension 10. Break 11. Visible/Object 12. Section 13. Extension 14. Break 15. Dimension
11HEX BOLT
5
7
14
21
1.25
SECTION A-A12
A 4
15
9
103
A6
7.00
8
13
003.03 identify line symbols 0
Alphabet of Lines
o used to show edges of an objecto are thick and dark
Visible/Object Lines
11HEX BOLT
5
7
14
21
1.25
SECTION A-A12
A 4
15
9
103
A6
7.00
8
13
Identify the Number(s) of Object/Visible Line Symbol
003.03 identify line symbols 0
Alphabet of Lines
o used to show edge that can not beseen in a plane
o thin and dashed
Hidden Lines
11HEX BOLT
5
7
14
21
1.25
SECTION A-A12
A 4
15
9
103
A6
7.00
8
13
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
11HEX BOLT
5
7
14
21
1.25
SECTION A-A12
A 4
15
9
103
A6
7.00
8
13
Identify the Number(s) of Center Line Symbol
003.03 identify line symbols 0
Alphabet of Lines-Summary
The alphabet of lines are thick andthin line symbols used on drawingsthat form a kind of graphic alphabet. Each line and line symbol has aspecial meaning.
