DJJ1012 ENGINEERING DRAWING Class 01 Suhaimi Said (PKS)
Jan 27, 2015
DJJ1012ENGINEERING DRAWING
Class 01
Suhaimi Said (PKS)
WHAT IS ENGINEERING DRAWING ??
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• An engineering drawing is a document that communicates a precise description of a part.
• This description consists of pictures, words, numbers and symbols.
• Together, these elements communicate part information to all drawing users.
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• In the past most engineering drawings were created by manual methods.
• Tools like drawing boards, T-squares, compasses, triangles, etc. were used.
• The original drawing was created on paper, vellum or Mylar that could be used for making blueprints.
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Today ….
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• Engineers created drawings using a computer.
• The designer creates an electronic version of a drawing.
• The original drawing is a computer file.
• Copies are made on a printer or plotter.
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• Whether engineering drawings are manual drawings or computer generated their purpose remains the same:
• To record and communicate design information.
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Type Of ENGINEERING DRAWING ??
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• Geometrical Drawing
• Mechanical Engineering Drawing
• Civil Engineering Drawing
• Electrical Engineering Drawing
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Geometrical Drawing
• The art representation of geometrical objects such as rectangular, square, cube, cone, cylinder, sphere, etc. on a paper
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Geometrical Drawing
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Mechanical Engineering Drawing
• The art representation of mechanical engineering object such as mashines, machine parts, etcs. on a paper.
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Mechanical Engineering Drawing
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Civil Engineering Drawing
• The art representation of civil engineering object such as roads, buildings, bridges, dams, etcs. on a paper
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Civil Engineering Drawing
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Electrical Engineering Drawing
• The art representation of electrical engineering object such as motors, generators, transfomers, poles, towers, wiring diagrams, etcs. on a paper
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Electrical Engineering Drawing
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ENGINEERING DRAWING
Instrument
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Drawing Board
• Drawing Board Size : 60cm x 80cm.
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Drawing Board
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Drawing Board
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Drawing Table
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Drawing Paper
• ANSI standard measure (American National Standard Institute) for drawing paper was as follows:
• A. 8.5” x 11” A. 9” x 12”
• B. 11” x 17” B. 12” x 15”
• C. 17” x 22” C. 18” x 24”
• D. 22” x 34” D. 24” x 36”
• E. 34” x 44” E. 36” x 48”
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T-Square
• Divided into two principal divisions namely
– head portion
– blade part
• Driver to draw vertical line and horizontal straight lines with using set square.
• During T angle's usage, it used close with left board
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T-Square
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T-Square
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Compass
• Used to form a circle line or arc.
• Consisting of two sticks that the one end could be met and can be adjusted.
• One end contain trick to be put on-centred something circle, or arc and end that another is pencil to draw line.
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Compass
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Divider
• Nearly identical with compass, the difference divider have two needle points.
• Divider used to divide something distance to several same division too or to move something distance once or repeat.
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Divider
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Protractor
• To get point of angle or to measure the angle
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Set square
• To get point of angle or to measure the angle
• Set square can give some degree of angle.
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Set square
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Set square
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Scale / Measure
• Not for making line, but only used as measure tool only.
• Scale that used must be in a unit only to avoid confusion or mistake when making measurement.
• After we get some measure, pencil used as marker to that measure.
• More accurate marking can be gained by using divider or compass.
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Scale / Measure
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French Curve
• Used to draw accurate line that could not be drawn with compass.
• Have many type of shape.
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French Curve
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Flexible French Curve
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Pencil
• Drawing Pencils is the most important tool used in engineering drawing.
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Pencil
• Drawing Pencils are made in different grades.
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Pencil
• The "HB" grade pencil is medium soft and dark in black colour, whereas 1H, 2H, grade pencils hard and light in black colour.
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Pencil
• "HB" Pencil is used for free hand works. Thin and light lines drawn by 1H & 2H pencils.
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Mechanical Pencils
• Size : 0.3, 0.5, 0.7, 0.9
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Eraser
• Used to erase line that draw by pencil.
• High quality eraser required : to avoid line that erase not leave effect to drawing paper surface.
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Eraser Shield
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