engineering drawing : class 01

DJJ1012ENGINEERING DRAWING

Class 01

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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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