Unit 7 Flashcards
Aligned dimension
A system of dimensioning which requires all numerals, figures, and notes to be aligned with the dimension lines so that they may be read from the bottom (for horizontal dimensions) and from the right side (for vertical dimensions).
allowance
The tightest possible fit between two mating parts.
american national standards institute (ANSI)
A private, non-profit organization that coordinates the development and use of a voluntary consensus standards in the United States.
american society of mechanical engineers (ASME)
A professional engineering organization that is known for setting codes and standards for mechanical devices in the United States.
audience analysis
The understanding of the consumer group for which the design is targeted. This would include the audiences, demographics, physical location, amount of time available to view the design, and interest in the subject matter.
auxiliary view
A view that is used to show features that are located on an inclined surface in true size and shape.
baseline dimensioning
System of dimensioning in which all dimensions are placed from a datum and not from feature to feature. Also referred to as Datum Dimensioning.
balloon
A circle with a single number connected to an assembly component with a leader line to refer to parts.
bilateral tolerance
A tolerance in which variation is permitted in both directions from the specified dimension.
blind hole
A hole that does not go completely through the workpiece.
broken-out section
A hole that does not go completely through the workpiece.
chain dimensioning
Also known as point-to-point dimensioning where dimensions are established from one point to the next.
clearance fit
Limits the size of mating parts so that a clearance always results when mating parts are assembled.
counterbore
A cylindrical recess around a hole, usually to receive a bolt head or nut.
countersink
A conical-shaped recess around a hole, often used to receive a tapered screw
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.
datum
A theoretically exact point, axis, or plane derived from the true geometric counterpart of a specific datum feature. The origin from which the location, or geometric characteristic of a part feature, is established.
datum dimensioning
A dimensioning system where each dimension originates from a common surface, plane, or axis. Also known as baseline dimensioning.
decision matrix
A tool used to compare design solutions against one another, using specific criteria.
detail drawing
A dimensioned, working drawing of a single part. Also referred to as part drawing.
detail view
A view that is used to show a magnified view of features that are too small to adequately specify in another view.
dual dimensions
Where alternate units are displayed within the same dimension.