boundary conditions - constraints and loads added to the boundaries of a finite element model
interference - amount of overlap between two instances in an assembly
clearance - minimum distances between two instances in an assembly
arc - A curved entity that represents a portion of a circle
boundary boxes - A square box used to sketch circles or ellipses
tick mark - A short dash used in sketching to locate points on the paper
right-handed system - Any 3-D coordinate system that is defined by the right hand rule
right-hand rule - Used to define a 3-D coordinate system where by pointing fingers of the right hand
down the x-axis and curling them in the direction of the y-axis, the thumb will point down the z-axis
left-handed system - Any 3-D coordinate system that is defined by the left-hand rule.
isometric axes - A set of three coordinate axes that are portrayed on the paper at 120 degrees relative
to one another.
isometric dot paper - Paper used for sketching purposes that includes dots located along lines that meet
at 120 degrees.
isometric pictorial - A sketch of an object that shows its three dimensions where isometric axes were
used as the basis for defining the edges of the object
, shading - Marks added to surfaces and features of a sketch to highlight to define 3-D space
isometric line - Lines on an isometric drawing that are parallel or perpendicular to the front, top, or
profile viewing planes
axonometric drawing - A drawing in which all three dimensional axes on an object can be seen, with the
scaling factor constant in each direction. Usually, one axis is shown as being vertical.
cabinet oblique drawing - An oblique drawing where one half the true length of the depth dimension is
measured along the receding axes.
cavalier oblique drawing - An oblique drawing where the true length of the depth dimension is
measured along the receding axes.
vanishing point (vp) - In the construction of a perspective view, the point on the horizon where all
parallel lines in a single direction converge.
plan view - In the construction of a perspective view, the object as viewed from the top, as if created by
orthogonal projection.
station point (sp) - In the construction of a perspective view, the theoretical location of the observer
who looks at the object through the picture plane.
picture plane (pp) - In the construction of a perspective view, the viewing plane through which the
object is seen. The PP appears as a line (edge view of the viewing plane) in the plan view
measuring line (ml) - In the construction of a perspective view, a vertical line used in conjunction with
the elevation view to locate vertical points on the perspective drawing.
measuring walls - In the construction of a perspective view, a line that extends from the object to the
vanishing point to help establish the location of horizontal points on the drawing
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