BP Terms & Def #2

Front

The size of a part before allowances and tolerances are applied.

Back

Basic size

Front

The extreme permissible dimensions of a part resulting from use of tolerances.

Back

Limits

Front

Method of referencing dimensions where accurate machining is required.

Back

Linear dimensions

Front

Refers to measured size of a part.

Back

Actual size

Front

points, surfaces, or lines from which references are made; indicated by letters with dashes on each size and enclosed in small boxes.

Back

Datum

Front

used for checking purposes; are without tolerances and not to be used for layout, machining, or inspection.

Back

Reference dimensions

Front

used on drawings which contain datum lines.

Back

Arrowless dimensions

Front

used to indicate the size of angles.

Back

Angular dimensions

Front

Used when a series of parts is made that has the same shape, but different sizes; dimensions are replaced with letters.

Back

Tabular Dimensions

Front

Used to designate size for a commerical product; may or may not be true size.

Back

Nominal size