Technical Drawing Line Styles and Types

Questions and Answers

Phantom lines are drawn as thin, alternating long dashes separated by two short ______.

dashes

Cutting plane lines show the location and path of imaginary cuts made through parts to show ______ details.

internal

Section lines, also known as ______, indicate the surfaces in a sectional view.

hatch patterns

Break lines are drawn to show that a part has been ______ to reduce its size on the drawing.

shortened Signup and view all the answers

Long break lines are thin solid lines that have ______ to indicate a break.

zigzags Signup and view all the answers

Object lines show the visible edges, corners, and surfaces of a ______.

part Signup and view all the answers

Hidden lines are drawn as thin, evenly spaced ______.

dashes Signup and view all the answers

Center lines show hole centers and center positions of rounded features such as arcs and ______.

radii Signup and view all the answers

Dimension lines are drawn with an ______ at both ends.

arrowhead Signup and view all the answers

Extension lines are drawn close to, but never ______, the edges or surface they limit.

touching Signup and view all the answers

Leader lines are used to show information such as dimensional notes, material specifications, and ______ notes.

process Signup and view all the answers

Phantom lines are used for several ______ in blueprints.

purposes Signup and view all the answers

Standard lines in technical drawings have both a definite ______ and a definite thickness.

pattern Signup and view all the answers

Study Notes

Line Styles and Types

Standard line styles ensure uniform meaning across technical drawings.
Line characteristics include patterns, thickness, completeness, and visibility.
Object lines are thick, solid lines defining visible edges, corners, and surfaces of objects.
Hidden lines utilize thin, evenly spaced dashes to represent edges or surfaces not visible in a particular view.
Center lines, used for various applications, consist of thin alternating long and short dashes, indicating hole centers or rounded feature symmetries.

Dimension and Extension Lines

Dimension and extension lines are thin, solid lines denoting direction, length, and limits of dimensions.
Dimension lines feature arrowheads at both ends, while extension lines remain close to but do not touch the object surfaces they limit.
Extension lines are typically perpendicular to the dimension lines.

Leader Lines

Leader lines serve to convey information such as dimensional notes and material specifications.
These lines are thin and solid, featuring an arrowhead at one end and a bent shape leading to the notation.
When referencing a surface, a dot replaces the arrowhead.

Phantom Lines

Phantom lines indicate alternate positions for moving parts and adjacent components, as well as simplifying repeated details.
Represented by thin alternating long dashes separated by short dashes.

Cutting Plane Lines

Cutting plane lines indicate locations and paths of imaginary cuts through parts to reveal internal details.
These lines are thick and consist of alternating long lines separated by short dashes, with arrowheads showing the sectional view direction.
Main types include straight and offset cutting plane lines.

Section Lines or Hatch Patterns

Section lines, or hatch patterns, illustrate how surfaces appear in sectional views after a cut is made.
Solid lines drawn at 45-degree angles represent these sections, with different symbols for various materials.

Break Lines

Break lines indicate that a part is shortened on the drawing, using specific line styles to convey breaks.
Long break lines are thin and zigzagged, while short break lines are thick, wavy, and drawn freehand.
Break lines suggest that the cut section matches the segments shown on either side.