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Terms in this set (29)
Text placed on a technical drawing that faces the bottom and the right side of the sheet. This technique is common on architectural drawings but is not allowed on drawings employing the ASME dimensioning standard.
American National Standards Institute (ANSI)
The national organization for the development of standards in the U.S. ASME Y14.5-2009 Dimensioning and Tolerencing and ASME Y14.2 Line Conventions and Lettering are two standards important to drafters.
A group of linear dimensions that are referenced from the same datum or baseline.
An experienced designer/drafter with expertise in manufacturing, drafting techniques, and dimensioning conventions who is responsible for reviewing and approving the drawings prepared by other drafters.
(CAM) Manufacturing processes in which manufacturing equipment and processes are controlled by computer commands.
A dimensioning technique in which a linear dimension is placed using the second extension line origin of a selected dimension as its first extension line origin. This technique is also called chain dimensioning.
A theoretically perfect feature(plane, axis, or point) from which dimensions are referenced.
Dimensioning rules that have been created to standardize dimensioning styles and techniques. Dimensioning standards for mechanical drawings have been defined by the American Society of Mechanical Engineers(ASME) and the International Standards Organization(ISO). Dimensioning standards for construction documents are defined by the U.S. National CAD standard.
Geometric Dimensioning and Tolerancing
A dimensioning technique that is used to control the form(flatness, straightness, circularity, and cylindricity), orientation(perpendicularity, angularity, and parralelism), or position of a part's features.
International Standards Organization
The international organization for the development of standards including technical drawing and dimensioning standards. ANSI represents the U.S. as a member of ISO. The ISO dimensioning standard is almost identical to the ASME dimensioning standard.
A dimension that describes the general size of a feature. Tolerances are applied to this dimension.
Quality Control Inspection
A step in the manufacturing cycle performed by a quality control (QC) inspector using precise measuring equipment to determine the actual size of the part. `
The total permissible variation in the size and/or shape of the object's features as defined by applying tolerances to the nominal size dimension. The difference between the upper and lower size limits of the feature.
Text placed on a technical drawing that faces only the bottom of the sheet. This technique is required when the ASME text standard is applied to a drawing.
What is tolerance?
A limit of variation in a dimension, a volume, or property.
What does ISO stand for?
International Standards Organization
What is a Datum?
A fixed starting point of a scale or operation.
Who is responsible for calculating tolerances on an engineering drawing?`
Is the diameter of a hole a size or a location dimension?
In the U.S., what is the name of the organization that publishes a dimensioning standard for engineering drawings?
What does the term CAM stand for?
What is a reference dimension?
A dimension used in a drawing to provide into for many other objects with same dimension.
What is meant by nominal size?
Standard size of a drawing
Which method of labeling text complies with the ASME standard: unidirectional or aligned?
e.Symbols and Arrows
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