Line can communicate an idea and define objects. Line represents important
information and details in the drawings, everything is represented through the
intensity of lines in technical drawings and it is very essential to draw them
accurately and with required purpose.
1. Enumerate the different alphabet of lines used in technical drawing?
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2. Tell how the alphabet of lines is used.
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Answers
1.ALPHABET OF LINE
OBJECT OR VISIBLE LINES – Thick dark line use to show outline of object, visible edges and surfaces.
CONSTRUCTION LINE – Very light and thin line use to construct layout work.
DIMENSION LINE – Thin and dark lines use to show the size (span) of an object with a numeric value.
2.Line symbols used in technical drawing are often referred to as ALPHABET OF LINES. The use of line symbols enables engineers/designers to express features of designed products clearly and accurately. Line features vary not only by width but also by how they are graphically represented in a drawing.
Answer:
Different Alphabet of lines
1.OBJECT OR VISIBLE LINES – Thick dark line use to show outline of object, visible edges and surfaces.
2. CONSTRUCTION LINE – Very light and thin line use to construct layout work.
3. DIMENSION LINE – Thin and dark lines use to show the size (span) of an object with a numeric value. Usually terminates with arrowheads or tick markings.
4. HIDDEN LINE – Short dash lines use to show non visible surfaces. Usually shows as medium thickness.
5. CENTRE LINE – Long and short dash lines. Usually indicates centre of holes, circles and arcs. Line is thin and dark.
6. EXTENSION LINE – Thin and dark line use to show the starting and ending of dimension.
7. CUTTING PLANE LINE – Extra thick line use to show cutaway views or plane of projection where a section view is taken. Arrow indicates direction of view.
8. SHORT AND LONG BREAK LINES –Short and long medium line use to show cutaway view of a long section.
9. LEADER LINE – Medium line with arrowhead to show notes or label for size or special information about a feature.
10. PHANTOM LINE – Long line followed by two short dashes use to show alternate position of a moving part.
11. SECTION LINE – Medium lines drawn at 45 degrees use to show interior view of solid areas of cutting plane line.
