Basic Drafting Skills - lee.k12.nc.us
Transcript of Basic Drafting Skills - lee.k12.nc.us
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Basic Drafting Skills
Alphabet of Lines003.03 Identify line symbols
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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
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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
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21
1.25
SECTION A-A12
A 4
15
9
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A6
7.00
8
13
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003.03 identify line symbols 0
Alphabet of Lines
o used to show edges of an objecto are thick and dark
Visible/Object Lines
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11HEX BOLT
5
7
14
21
1.25
SECTION A-A12
A 4
15
9
103
A6
7.00
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Identify the Number(s) of Object/Visible Line Symbol
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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
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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
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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
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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
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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.