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The language of technical drawing


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Learn the tools for drawing

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The language of technical drawing

  2. 2. Drawing  Technical drawing is the method of communication that is specific to the field of technology  It is used to represent the objects that we design and built. Ingredients of technology
  3. 3. Drawing Ingredients of technology  Now, let´s learn the basic drawing instruments
  4. 4. PENCIL  Pencils are made of wood and a graphite core, called lead.  Pencil leads are classified by hardness as follows: Soft •Numbers: 0 or1 • Letters: 8B to 3B Medium •Numbers: 2 or 3 • Letters: 2B, B, HB and F Hard •Numbers: 4 or 5 • Letters: H to 5H Very hard •Numbers: 6 to 9 • Letters: 6H to 10H
  5. 5. PENCIL When we write, the graphite latch on to the paper.  If the pencil is a hard one the amount of graphite is a bit one, and the mark in the paper is light.  On the other hand if it´s a soft one the amount of graphite is bigger, and the mark is dark.
  6. 6. PENCIL  Hard Pencils are used for plans and technical drawing .  Soft Pencils are used for sketches and artistic drawing.
  7. 7. PROPELLING PENCIL  Propelling pencils have a lead into a body, commonly made of plastic.  Propelling pencils provide lines of constant thickness without sharpening.  They are used in technical drawing (not in artistic drawing) and writing.
  8. 8. PROPELLING PENCIL  The lead of the propelling pencils can have:  Different hardness  Different diameters, to fit into a lead into the reservoir tube. Diameter Hardness
  9. 9. RUBBER  Rubbers are used to correct errors made when writing with pencil. White vinyl rubbers are recommendes.  When you erase:  Follow the direction the line was draw in.  Use smooth movements so the paper doesn´t wrinkle
  10. 10. TECHNICAL PEN  Technical pens are used to trace over with ink the lines previously drawn with a pencil  Technical pens are calibrated and gives the lines a standarized width.
  11. 11. RULER  Rulers are instruments used to draw straight lines and measure segments. Common ruler: It´s marked along one side. Engineer´s scale: It´s a triangular prism on which the six most common scales are etched.
  12. 12. SET OF SQUARES  The set of squares are two right triangles used to draw paralel and perpendicular lines.  They let us to draw differents angles combining the measures of the angles of the set . For example: 90º+45º = 135º 30º+45º = 75º 60º+45º = 105º 90º+60º = 150º leg leg
  13. 13. PROTACTOR  The protactor is used to measure or draw angles.  It used to be semicircular and is divided into 180 degrees.
  14. 14. TEMPLATES  The stencils are used when standard symbols are to be drawn repeatedly. They have standard symbols cut in it.
  15. 15. COMPASS  The compass is an instrument used to draw circunferences or circular arcs, as well as to measure segments.  It can be adjusted to hold a technical pen.  Or with an extension piece to draw bigger circunferences
  16. 16. PAPER  The paper is the basis for all technical drawings.  Paper can be clasified by:  Size  Weight  Finish
  17. 17. PAPER (Size)  There are different sizes of paper. They are also called formats.  In technical design, the most common formats are the “A” series, based on the DIN (Deutsche Industrienorm)
  18. 18. PAPER (Size)  A0 is a rectangle with an area of 1 m2.  Each format is calculated by dividing the previous format in half.  The format we usually use is the A4 (297x210 mm)
  19. 19. PAPER (Weight)  The weight of the paper indicates how thick or thin it is.  Usually the weight is indicated in grams per square metre.  More grams implies a thicker paper
  20. 20. PAPER (Finish)  The finish of the paper shows the appearance of the surface of the paper.  It can be white or coloured  It can be rough or  It can be brilliant or dull smooth  It can be opaque or translucent