DJJ1012 - CLASS 01
Transcript of DJJ1012 - CLASS 01
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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