PLTW - IED Unit 7 Key Terms
Terms in this set (56)
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).
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.
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.
A view that is used to show features that are located on an inclined surface in true size and shape.
System of dimensioning in which all dimensions are placed from a datum and not from feature to feature
A circle with a single number connected to an assembly component with a leader line to refer to parts.
A tolerance in which variation is permitted in both directions from the specified dimension.
A hole that does not go completely through the workpiece.
A section of an object broken away to reveal an interior feature for a sectional drawing.
Also known as point-to-point dimensioning where dimensions are established from one point to the next.
limit the size of mating parts so that a clearance always results when mating parts are assembled
A cylindrical recess around a hole, usually to receive a bolt head or nut.
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.
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.
A dimensioning system where each dimension originates from a common surface, plane, or axis. Also known as baseline dimensioning.
A tool used to compare design solutions against one another, using specific criteria.
A dimensioned, working drawing of a single part. Also referred to as part drawing.
A view that is used to show a magnified view of features that are too small to adequately specify in another view.
Where alternate units are displayed within the same dimension.
a inside radius between two intersecting planes
To show lines or objects shorter than their true size. Foreshortened lines are not perpendicular to the line of sight.
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.
Notes placed separate from the views; relate to the entire drawing.
the amount of overlap that one part has with another when assembled
Limits the size of mating parts so that an interference always results when mating parts are assembled.
International Organization for Standardization (IOS)
This is a worldwide organization that creates engineering standards.
Least Material Condition (LMC)
The smallest size limit of an external feature and the largest size limit of an internal feature.
The largest and smallest possible boundaries to which a feature may be made as related to the tolerance of the dimension.
Connected to specific features on the views of the drawing. Also known as annotations.
A location dimension that defines the relationship of features of an object.
The activity of gathering information about consumers needs and preferences
Maximum Material Condition (MMC)
The largest size limit of an external feature and the smallest size limit of an internal feature.
The designation of the size established for a commercial product.
A drawing that contains all the information for making one part of the design.
A list of materials or parts specified for a project. Also referred to as a bill of materials or BOM.
A distance of uniform measurement determined at a point on one unit to the same corresponding point on the next unit; used in threads, springs, and other machine parts.
A dimension, usually without a tolerance, used for information purposes only. A reference is a repeat of a given dimension or established from other values shown on a drawing. Reference dimensions are enclosed in ( ) on the drawing.
An outside radius applied to corners.
Lines that are used to represent the material through which a cut is made in order to show an interior sectional view.
A view that is used to show details not apparent on the exterior of the part.
Placed directly on a feature to identify a specific size or may be connected to a feature in the form of a note.
The dimension noted or, in the case of a tolerance, the part of the dimension from which the limits are calculated.
A shallow recess like a counterbore, used to provide a good bearing surface for a fastener.
An investigation of the opinions or experience of a group of people, based on a series of questions.
To cut internal threads.
Gradual diminution of width or thickness in an elongated object.
A type of expository writing that is used to convey information for technical or business purposes.
The acceptable amount of dimensional variation that will still allow an object to function correctly
Occurs when two mating parts can sometimes have a clearance fit and sometimes have an interference fit.
A dimensioning system which requires all numerals, figures and notes t be lettered horizontally and to be read from the bottom of the sheet
A tolerance in which variation is permitted in only one direction from the specified dimension.
Drawings that convey all of the information needed to manufacture and assemble a design
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