Alphabet of Lines Flashcards
This is what we call the lines used in drafting. Wherein each segment, line, point, thickness has an equivalent meaning
Alphabet of Lines
Line types and conventions for mechanical
drawings are covered in ________________
ANSI Standard (Y14.2M)
ANSI stands for?
American National Standards
Institute
What are the 4 different and distinct thicknesses of lines in orthographic projection?
Very Thick, Thick, Medium, and Thin
What is the preference order of Type of Lines?
Visible (object/feature) lines
– Hidden lines
– Cutting plane lines
– Center lines
– Break lines
– Dimension lines
– Extension lines/lead lines
– Section lines/crosshatch lines
The most important lines that stand out from all other secondary lines with a Thick line weight
Visible/Feature Lines
The short narrowed dashed lines that represent the hidden features of the object that begins and ends with a dash (Medium Thick line weight)
Hidden Lines
Used to indicate the termination of a dimension, approximately (2 – 3 mm) from the feature being dimensioned
Extension Lines
Lines are used to show the extent and the direction of dimensions with an
arrowhead on mechanical
engineering drawings; a slash, or a
dot in architecture.
Dimension Lines
A continuous straight line that extends at an angle from a note, a dimension, or other reference to a feature
Leader Lines
It representa an imaginary cut in an object
Break Lines
Lines that represent the axes of symmetrical parts of features, bolt circles, paths of motion, and pitch circles
Center Lines
They are used to represent
alternate positions of moving parts, adjacent positions of related parts, and repeated details
Phantom Lines
Lines that are thin, uniformly spaced lines that indicate the exposed cut surfaces of
an object in a sectional view
Section Lines
Lines that show where an imaginary cut has been made through an object in order to view and understand the interior features
Cutting Plane Lines
