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CHAPTER 3: Drafting Equipment

CHAPTER 3: Drafting Equipment. Mrs. Kampf Engineering Graphics I. Drafting Board. Drawing sheet attached to it. 9X12, 16X21 or 18X24 Wood with vinyl cover Stay flat and straight. T-Square. A head that lines up with a true edge of the drafting board Straightedge provides a true edge

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CHAPTER 3: Drafting Equipment

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  1. CHAPTER 3:Drafting Equipment Mrs. Kampf Engineering Graphics I

  2. Drafting Board • Drawing sheet attached to it. • 9X12, 16X21 or 18X24 • Wood with vinyl cover • Stay flat and straight

  3. T-Square • A head that lines up with a true edge of the drafting board • Straightedge provides a true edge • Metal, wood with plastic

  4. Triangles • Used with t-square • 45° has a 90° angle and two 45° • 30° -60° triangle has a 30° a 60° and a 90°

  5. Protractor • Used to measure or lay out angles • right, acute, obtuse

  6. Irregular Curves • French curves • Used to draw noncircular curves like spirals and ellipses.

  7. Templates • Save time in drawing shapes of details.

  8. Vellum • Tracing paper that has been treated to make it more transparent.

  9. ANSI • American National Standards Institute

  10. ISO • International Standards Organization

  11. Paper • Size A - Letterhead 8.5” X 11” • Size B - Tabloid 11” X 17” • Size C - 17” x 22” • Size D - 22” X 34” • Size E - 34” X 44”

  12. Case instruments • Drawing instruments that come in a set.

  13. Dividers • Lines can be divided and distances can be transferred with this • Bow and Friction-joint

  14. Compass • True circles or arcs can be drawn with this • Bow and Friction-joint

  15. Bow instruments • Can be adjusted with either a center wheel or a side wheel • Easy to use and accurate.

  16. Graphite pencils • 17 degrees of hardness or grades • Grade you use depends on paper type, line weight and darkness of lines made • 6B to 9H, #2/HB is middle • Hardness, Blackness, Fine Point

  17. Eraser • Vinyl erasers for film, kneaded, pink pearl, gum, Magic rub

  18. Erasing shield • Use to avoid erasing nearby lines accidentally • Plastic or metal and have different size and shape openings

  19. Scales • Instruments used to lay off distances and make measurements • Full size or some proportion • Scaled.

  20. Architect’s scale • Inch Scale • Divided into proportional feet’ and inches” • Used for drawing buildings

  21. Mechanical Engineer’s scale • Inches and fractions of an inch divided to represent inches • Use for drawing machine parts

  22. Civil Engineer’s scale • Inches divided into decimals • Units could be inch, feet, miles etc • Used for maps and drawings of roads

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