FOOTINGS Weight-bearing concrete construction
elements poured in place in the earth to support a
FORGINGThe process of shaping heated metal by
hammering or other impact.
FORMAT The general makeup or style of a drawing.
FRAME LINESThe outline of transverse plane
sections of a hull.
FRENCH CURVEAn instrument used to draw
smooth irregular curves.
FULL SECTIONA sectional view that passes
entirely through the object.
HALF SECTION A combination of an orthographic
projection and a section view to show two halves of
a symmetrical object.
HATCHINGThe lines that are drawn on the internal
surface of sectional views. Used to define the kind
or type of material of which the sectioned surface
HELIX The curve formed on any cylinder by a
straight line in a plane that is wrapped around the
cylinder with a forward progression.
HIDDEN LINESThick, short, dashed lines
indicating the hidden features of an object being
INSCRIBED FIGURE A figure that is completely
enclosed by another figure.
INTERCONNECTION DIAGRAM A
showing the cabling between electronic units, as
well as how the terminals are connected
INTERNAL THREADA thread on the inside of a
member. Example: the thread inside a nut.
ISOMETRIC DRAWINGA type of pictorial
drawing. See ISOMETRIC PROJECTION.
ISOMETRIC PROJECTIONA set of three or more
views of an object that appears rotated, giving the
appearance of viewing the object from one corner.
All lines are shown in their true length, but not all
right angles are shown as such.
ISOMETRIC WIRING DIAGRAMA diagram
showing the outline of a ship, an aircraft, or other
structure, and the location of equipment such as
panels and connection boxes and cable runs.
JOISTA horizontal beam used to support a ceiling.
KEYA small wedge or rectangular piece of metal
inserted in a slot or groove between a shaft and a
hub to prevent slippage.
KEYSEATA slot or groove into which the key fits.
KEYWAYA slot or groove within a cylindrical tube
or pipe into which a key fitted into a key seat will
LEADThe distance a screw thread advances one turn,
measured parallel to the axis. On a single-thread
screw the lead and the pitch are identical; on a
double-thread screw the lead is twice the pitch; on
a triple-thread screw the lead is three times the pitch.
LEADER LINESTwo, unbroken lines used to
connect numbers, references, or notes to
appropriate surfaces or lines.
LEGENDA description of any special or unusual
marks, symbols, or line connections used in the
supported at its ends. Usually located over a door
LOGIC DIAGRAMA type of schematic diagram
using special symbols to show components that
perform a logic or information processing function.
MAJOR DIAMETERThe largest diameter of an
internal or external thread.
MANIFOLDA fitting that has several inlets or
outlets to carry liquids or gases.
MECHANICAL DRAWINGSee DRAWINGS.
Applies to scale drawings of mechanical objects.
MIL-STD (military standards)A formalized set of
standards for supplies, equipment, and design work
purchased by the United States Armed Forces.
NOTESDescriptive writing on a drawing to give
verbal instructions or additional information.
OBLIQUE DRAWINGA type of pictorial drawing
in which one view is an orthographic projection and
the views of the sides have receding lines at an
OBLIQUE PROJECTIONA view produced when
the projectors are at an angle to the plane the object
illustrated. Vertical lines in the view may not have
the same scale as horizontal lines.
OFFSET SECTIONA section view of two or more
planes in an object to show features that do not lie
in the same plane.