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Technical Drawing
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Terms in this set (33)
Plane geometry
geometry of flat surfaces (2-dimensional)
Solid geometry
geometry of solids in three planes (3-dimensional)
Bisection
dividing into two equal parts
Border lines
very thick dark lines used to draw borders
Visible lines
dark lines used to draw outlines
Construction lines
very light lines used to develop drawing
Section lines
thin dark used to draw cross hatching lines, dimension lines, and extension lines
Guide lines
very light lines used as guides for printing/writing
Centre lines
thin dark chain line used to indicate centres, and symmetrical axes
Hidden lines
thin dark short dashed lines used to represent unseen edges
Break line (small objects)
thin dark curvy free hand drawn line to show limits of short broken section
Break lines (large object)
thin dark zig-zag line used to show the limits of a long broken section
Cutting plane line
dark centre chain line thick at both ends with arrows, used to show the location of cutting planes
Phantom lines
slim dark chain line of one long dash and two very short dashes used to indicate connecting part not part of the main design
Line
a continuous series of points
Angle
the revolutionary measure around the common point of two diverging lines
Perpendicular line
line at 90 degrees to another line
Parallel line
line having equal distance from another line
Right angle
lines at 90 degrees
Acute angle
angle less than 90 degrees
Obtuse angle
angle more than 90 degrees but less than 180 degrees
Reflex angle
angle more than 180 degrees
Complementary angles
sum of adjacent angles equal to 90 degrees
Supplementary angles
sum of adjacent angles equal to 180 degrees
Bisection of an angle
angle divided into two equal angles
Bisection of a line
line divided into two equal parts
Dimensioning
shows size or location
Dimension lines
fine dark line terminated by arrowheads indicating direction and extension of dimension
Extension lines
fine dark line extended from a point on the drawing perpendicular to the referred dimension line
Dimensions
placed parallel to the referred size of location
Extension lines
placed a little pass but perpendicular the dimension line with a gap before the point on the drawing
Line
a continuous series of points
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