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DJJ1012ENGINEERING DRAWING

Class 01

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An engineering drawing is a document thatcommunicates a precise description of a part.

This description consists of pictures, words,numbers and symbols.

Together, these elements communicate partinformation to all drawing users.

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In the past most engineering drawings werecreated 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 makingblueprints.

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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 manualdrawings or computer generated theirpurpose remains the same:

To record and communicate designinformation.

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Type OfENGINEERING 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 objectssuch 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 mechanicalengineering object such as mashines, machineparts, etcs. on a paper.

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Mechanical Engineering Drawing

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Civil Engineering Drawing

The art representation of civil engineeringobject 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 electricalengineering object such as motors,generators, transfomers, poles, towers, wiringdiagrams, 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 Paper

ANSI standard measure (American NationalStandard Institute) for drawing paper was asfollows:

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 horizontalstraight lines with using set square.

During T angle's usage, it used close with leftboard

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T-Square

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T-Square

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Compass

Used to form a circle line orarc.

Consisting of two sticks thatthe one end could be met andcan be adjusted.

One end contain trick to be puton-centred something circle, orarc and end that another ispencil to draw line.

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Compass

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Divider

Nearly identical withcompass, the differencedivider have two needle

points. Divider used to divide

something distance to severalsame division too or to movesomething distance once orrepeat.

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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 measuretool only.

Scale that used must be in a unit only to avoid

confusion or mistake when makingmeasurement.

After we get some measure, pencil used asmarker to that measure.

More accurate marking can be gained by usingdivider or compass.

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Scale / Measure

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French Curve

Used to draw accurate line that could not bedrawn 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 are made in different grades.

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Pencil

The "HB" grade pencil is medium soft and darkin black colour, whereas 1H, 2H, grade pencilshard and light in black colour.

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Pencil

"HB" Pencil is used for free hand works. Thinand 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