The ALPHABET of L I N E S. - ppt download

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Visible Object Lines are thick dark solid (unbroken) lines that are used on drawings to indicate the edges and details of an object.
The different lines and line symbols used on drawings form a kind of graphic alphabet commonly known as the alphabet of lines. Two line widths-thick and thin-are generally used. Drawings are easier to read when there is good contrast among different kinds of lines. All lines must be uniformly sharp and black.
5. Leader 6. Hidden 7. Center 8. Visible/object. 9. Extension 10. Break 11. Visible/object. 12. Section 13. Extension 14. Break 15. Dimension.
Hidden Lines are thin dashed lines used to indicate a surface, edge, or contour of an object that cannot be seen, or is hidden from view.
They are used to indicate the center of symmetrical features, such as circles or arcs. They are used as an aid in dimensioning..
Section Lines are thin cross hatching lines used in sectional views to symbolize different parts of an object or different materials from which an object is manufactured.
are thin lines used for dimensioning purposes. Dimension and leader lines generally end with arrow heads and are accompanied by a number indicating a size or location dimension.
Arrowheads on both ends of the line point toward the surface to be viewed..
Short break lines are thick wavy freehand lines. Long break lines are thin straight zig- zags..
Phantom Lines are thin lines used to indicate alternate positions of moving parts, lines of motion, adjacent parts and repetitive details.