ALPHABET OF LINES VISABLE OBJECT LINES THICK SOLID LINES SHOWS THE OUTLINE OF THE OBJECT VISIBLE TO THE EYE HIDDEN INVISIBLE LINES SHORT EVENLY SPACED DASHES REPRESENT SURFACES THAT ARE NOT DIRECTLY VISIBLE TO THE EYE ID: 908566
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Slide1
Alphabet of lines
SKETCHING 101
Slide2ALPHABET
OF
LINES
Slide3VISABLE (OBJECT) LINES
THICK, SOLID LINES
SHOWS THE OUTLINE OF THE OBJECT
VISIBLE TO THE EYE
Slide4HIDDEN (INVISIBLE) LINES
SHORT, EVENLY SPACED DASHES
REPRESENT SURFACES THAT ARE NOT DIRECTLY VISIBLE TO THE EYE.
ALWAYS STARTS WITH A DASH IN CONTACT WITH A LINE AT ITS START EXCEPT WHEN THE DASH WOULD FORM A CONTINUATION OF A SOLID LINE.
Slide5Slide6CENTER LINES
ALTERNATING SHORT AND LONG LINES, LINES ARE THIN AND DARK
A LINE
THROUGH THE CENTER OF AN OBJECT
– ESPECIALLY ONE FOLLOWING AN AXIS OF SYMMETRY (CIRCLE, HOLE, ARC OR CYLINDER)
Slide7DIMENSION AND EXTENSION
lINES
DIMENSION LINES
– SHORT SOLID LINES WITH ARROW HEADS AT EACH END,
BROKEN IN THE MIDDLE TO SHOW DIMENSION OR VALUE
SHOWS THE DISTANCE BETWEEN 2 POINTS
EXTENSIONS LINES
– SHORT SOLID LINES USED TO SHOW THE LIMITS OF DIMENSIONS.
PLACED INSIDE OR OUTSIDE THE OUTLINE OF AN OBJECT
THEY EXTEND FROM AN OUTLINE OR SURFACE, BUT DO NOT TOUCH IT.
SAME WEIGHT AS INVISIBLE LINES
Slide8CUTTING PLANE LINES
A THICK DASHED LINE FOLLOWED BY TWO SHORTER DASHES
TERMINATES WITH A SHORT 90 DEGREE ARROWHEADS
SHOWS WERE A PART IS MENTALLY CUT IN HALF TO BETTER SEE THE INTERIOR DETAIL
Slide9SECTION LINES (CROSSHATCH)
THIN EVENLY SPACED LINES, USUALLY DRAWN AT A 45 DEGREE ANGLE.
INDICATES THE MATERIAL THAT HAS BEEN CUT THROUGH IN A SECTIONAL VIEW
USUALLY INDICATED WITH A LETTER TO IDENTIFY THE CUT SURFACE.
Slide10BREAK LINES
CAN BE LONG OR SHORT
USED TO INDICATE THE PART IS BROKEN OUT TO CLEARLY SHOW A PART UNDERNEATH
ALSO USED TO REDUCE SIZE OF A DRAWING OF A LONG PART W/ UNIFORM CROSS SECTION
SHORT BREAKS INDICATED BY THICK SOLID HAND DRAWN LINES
LONG BREAKS INDICATED BY THIN SOLID RULED LINES BY FREEHAND ZIGZAGS
BREAKS ON SHAFTS, RODS, TUBES, AND PIPES ARE CURVED
Slide11PHANTOM LINES
THIN LINES
INDICATE ALTERNATE POSITIONS OF PARTS OF THE OBJECT
SHOWS REPEATED DETAILS OR LOCATIONS OF ABSENT PARTS
ONE LONG AND TWO EVENLY SPACED SHORT DASHES (LONG DASH ON EACH END)