Technical Drawing Lines Definitions

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Questions and Answers

What is a line segment in the context of technical drawing?

A simple part of a continuous line.

A grouping of two or more line elements forming a complete figure.

A grouping of two or more line elements forming a line. (correct)

An imaginary junction of two surfaces.

Which type of line is primarily used to indicate visible edges and outlines?

Thick Dashed Line

Thin Long Dash, Point Line

Thin Dashed Line

Thick Continuous Line (correct)

What does a thin dashed line signify in technical drawing?

Visible edges

Invisible edges and outlines (correct)

Surface treatments

Dimension lines

What type of line is used to indicate axes and symmetry in technical drawings?

Thin Long Dash, Point Line Signup and view all the answers

What is the primary use of the Thin Long Dash, Short Dash Line?

For dimension lines and auxiliary dimension lines Signup and view all the answers

Which line type is used to indicate surface treatments such as heat treatment?

Thick Dashed Line Signup and view all the answers

The Thick Long Dash, Double Short Dash Line is primarily used for which of the following?

Dimension lines and hatching Signup and view all the answers

Which type of line indicates the extreme positions of moving parts?

Thin Long Dash, Triple Point Line Signup and view all the answers

Which type of line indicates areas for dimensions and section details?

Continuous Line Signup and view all the answers

Which line type is NOT used for indicating repeated details?

Thick Long Dash, Triple Point Line Signup and view all the answers

What is the role of an indicator line in technical drawing?

To convey additional information about a feature Signup and view all the answers

What is the role of the Thin Dash, Point Line?

For imaginary junctions and projection lines Signup and view all the answers

Which line type is used to indicate limited areas of surface treatment?

Thick Long Dash, Point Line Signup and view all the answers

Which line type is used specifically for indicating junctions of two curved surfaces?

Thick Long Dash, Double Short Dash Line Signup and view all the answers

What is the function of the Thick Double Dash, Point Line?

For imaginary junctions and reference lines Signup and view all the answers

What defines the 'Point Length' in line dimensions?

Half the thickness of the line Signup and view all the answers

Study Notes

Lines in Technical Drawing - Definitions

Line A geometric object with a length at least half its width that joins an initial point to a final point either continuously or discontinuously, curved or straight, with the initial and final points possibly coinciding (e.g., a circle).
Line Element A simple part of a discontinuous line, such as spaces, points, and dashes.
Line Segment A grouping of two or more line elements forming a line, for example, "space-dash."
Indicator Line A line that accompanies a feature of a piece or view with additional information.
Reference Line Vertical or horizontal lines used as baselines to display information.

Types of Lines

Continuous Line Used for imaginary junctions of two curved surfaces, dimension lines, auxiliary dimension lines, indicator lines, reference lines, hatching, rotated section outlines, short center axes, fillet core, screw thread origin and end, dimension line diagonals, cross-section indication, fold lines, section details, indication of repeated details, calibration plane indicator, sheet position, and projection lines.
Thick Continuous Line Used for visible edges and outlines, thread crest, thread length limit, representation of diagrams, maps of reticular metal structures, separation of matrices in piece views, cut and section arrow lines.
Thin Dashed Line Used for invisible edges and outlines.
Thick Dashed Line Used to indicate surface treatments, such as heat treatment.
Thin Long Dash, Point Line Used to indicate axes, symmetry axes, primitive gear circumference, center hole circumference.
Thick Long Dash, Point Line Used to indicate limited areas of surface treatment and plane cutting positions.
Thin Long Dash, Double Point Line Used to indicate adjacent pieces, extreme positions of moving parts, center axes, developments prior to shaping, parts in front of a cutting plane, displacement zones, outline of the finished part within the rough piece being machined, framing of particular zones and projected tolerance zones.
Thick Long Dash, Double Point Line Used to indicate adjacent pieces, extreme positions of moving parts, center axes, developments prior to shaping, parts in front of a cutting plane, displacement zones, outline of the finished part within the rough piece being machined, framing of particular zones and projected tolerance zones.
Thin Long Dash, Triple Point Line Used to indicate adjacent pieces, extreme positions of moving parts, center axes, developments prior to shaping, parts in front of a cutting plane, displacement zones, outline of the finished part within the rough piece being machined, framing of particular zones and projected tolerance zones.
Thick Long Dash, Triple Point Line Used to indicate adjacent pieces, extreme positions of moving parts, center axes, developments prior to shaping, parts in front of a cutting plane, displacement zones, outline of the finished part within the rough piece being machined, framing of particular zones and projected tolerance zones.
Thin Long Dash, Short Dash Line Used for imaginary junctions of two curved surfaces, dimension lines, auxiliary dimension lines, indicator lines, reference lines, hatching, rotated section outlines, short center axes, fillet core, screw thread origin and end, dimension line diagonals, cross-section indication, fold lines, section details, indication of repeated details, calibration plane indicator, sheet position, and projection lines.
Thick Long Dash, Double Short Dash Line Used for imaginary junctions of two curved surfaces, dimension lines, auxiliary dimension lines, indicator lines, reference lines, hatching, rotated section outlines, short center axes, fillet core, screw thread origin and end, dimension line diagonals, cross-section indication, fold lines, section details, indication of repeated details, calibration plane indicator, sheet position, and projection lines.
Thin Dash, Point Line Used for imaginary junctions of two curved surfaces, dimension lines, auxiliary dimension lines, indicator lines, reference lines, hatching, rotated section outlines, short center axes, fillet core, screw thread origin and end, dimension line diagonals, cross-section indication, fold lines, section details, indication of repeated details, calibration plane indicator, sheet position, and projection lines.
Thick Double Dash, Point Line Used for imaginary junctions of two curved surfaces, dimension lines, auxiliary dimension lines, indicator lines, reference lines, hatching, rotated section outlines, short center axes, fillet core, screw thread origin and end, dimension line diagonals, cross-section indication, fold lines, section details, indication of repeated details, calibration plane indicator, sheet position, and projection lines.

Line Dimensions (Normalized)

Point Length: Half the thickness of the line
Space Length: Three times the thickness of the line
Short Dash Length: Six times the thickness of the line
Long Dash Length: 24 times the thickness of the line
Space Length: 18 times the thickness of the line

Line Thicknesses (Normalized)

0.1 to 1.2 mm
0.5 mm
0.8 mm
2.0 mm

Line Variations

Wavy
Spiral
Zig-zag
Freehand
Double continuous line
Continuous line with dashed line
Continuous line with wavy line

Line Graphic Elements

Example Graphic Elements

General Considerations

Minimum space between two parallel lines: 0.7 mm
Intersecting dashed lines should not intersect at their spaces.
When placing a second line (e.g., to follow a contour), it should be located below or to the right of the original line.

Key Sources

IRAM 45.000-02, 20, 22, and 24
ISO 128

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Description

Explore the intricacies of lines in technical drawing with this quiz. Delve into the definitions and types of lines such as continuous lines, reference lines, and more. Enhance your understanding of how these elements contribute to technical visualization.