An orthographic view of an object using a direction of sight other than one of the six basic views (front, top, right-side, rear, bottom, left-side); used to show a surface that is not parallel to any of the principal view planes.
A circled number identifying each part shown in an assembly drawing. Also called a ball tag or bubble number.
Broken Out Section
A section of an object broken away to reveal an interior feature for a sectional drawing.
A hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface.
Cutting Plane Line
A line drawn on a view where a cut was made in order to define the location of the imaginary section plane.
Degree of freedom
One of the minimum number of parameters needed to describe the state of a physical system.
An assembly drawing in which parts are moved out of position along an axis so that each individual part is visible.
A rounded interior blend between two surfaces. Some uses are to strengthen joining surfaces or to allow a part to be removed from a mold.
A sectional drawing based on a cutting plane line that extends completely through an object.
A sectional drawing based on a cutting plane line that cuts through one-quarter of an object. A half section reveals half of the interior and half of the exterior.
A rectangular or semicircular shape used to prevent parts, such as gears or wheels, from turning on a shaft.
A constant in the equation of a curve that can be varied to yield a family of similar curves.
A CAD modeling method that uses parameters to define the size and geometry of features and to create relationships between features. Changing a parameter value updates all related features of the model at once.
A list of materials or parts specified for a project. Also referred to as a bill of materials or BOM.
A line used to show the alternate positions of an object or matching part without interfering with the main drawing.
Lines that are used to represent the material through which a cut is made in order to show an interior sectional view.
A drawing that shows the interior of an object as it would appear if cut in half or quartered.
A shallow recess like a counterbore, used to provide a good bearing surface for a fastener.
A table located in the bottom right-hand corner of an engineering drawing that identifies, in an organized way, all of the necessary information that is not given on the drawing itself. Also referred to as a title strip.
Drawings that convey all of the information needed to manufacture and assemble a design.