Lines and Their Uses in Orthographic Projection

A presentation by professor Romel Cipriani

Lines and Their Uses in Orthographic Projection

Family of Lines

Family of Lines

Object Line: Object lines are thick, solid lines that outline all surfaces visible to the eye

Hidden Lines: Hidden or invisible lines, consist of short evenly spaced dashes, outline hidden or invisible surfaces.

Center Line: Centerlines consist of alternating long and short evenly spaced dashes, with a long dash at each end and short   dashes at point of intersection.

Phantom Lines: Phantom lines are thin lines used to indicate alternate position of the parts of an object, repeated detail, or the   location of absent parts.

Dimension Lines: Dimension lines are short, solid lines that indicate the distance between two point on a drawing.  They terminate   with arrowheads at each end, and are broken to insert dimension.

Extension Lines: Extension lines are short, solid lines used to show the limits   of dimensions.  They may be placed inside or outside the   outside the outline of an object. They extend from an outline or surface, but do not touch it

Leaders: Leaders or leader lines indicate the part or area of a drawing to which a number, note, or other reference applies.  They are thin, solid lines and usually terminate in a single arrowhead.

Break Line:  Brake lines indicate that a part is broken out or removed either to (1) show more clearly the part or parts that lie directly   below the broken out part (2) to reduce the size of the drawing of a long part having uniform cross section so tat it   can be shown on a smaller sheet.

Section Lines: Section lines or crosshatch lines distinguish between two separate parts that meet a given point.  Having said this, section lines are used to depict a particular type of material. In assembly drawings, where many kinds of material may be used, individual parts may be crosshatched with the symbol for a particular material.

Cutting Plane Line: a cutting plane line consists of a heavy dash followed   by two shorter dashes.  At each end, it has a short   line at right angles to the cutting plane line terminating with arrowheads pointing in the direction from which the cut surface is viewed.

Section Lines

Section Lines

External and Internal Threads

External and Internal Threads


2 Responses to Lines and Their Uses in Orthographic Projection

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