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Assembly

a group of machine parts that fit together to form a self-contained unit.

Balloons

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.

Component

an artifact that is one of the individual parts of which a composite entity is made up

Countersink

a bit for enlarging the upper part of a hole

Degree of Freedom

(statistics) an unrestricted variable in a frequency distribution

Exploded Assembly

An assembly drawing in which parts are moved out of position along an axis so that each individual part is visible.

Full Section

A sectional drawing based on a cutting plane line that extends completely through an object.

Key

metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated

Parameter

a quantity (such as the mean or variance) that characterizes a statistical population and that can be estimated by calculations from sample data

Parametric Modeling

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.

Rotation

a single complete turn (axial or orbital)

Section Lines

Lines that are used to represent the material through which a cut is made in order to show an interior sectional view.

Subassembly

An assembled part that is a part of a larger assembly.

Title Block

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.

Assembly Drawing

A drawing that shows the various parts of an item when assembled.

Blind Hole

A hole that does not go completely through the workpiece.

Chamfer

A small angled surface formed between two surfaces.

Constraint

the state of being physically constrained

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.

Documentation

documentary validation

Foreshorten

shorten lines in a drawing so as to create an illusion of depth

Half Section

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.

Keyseat

A slot in a shaft to receive a key.

Parts List

A list of materials or parts specified for a project. Also referred to as a bill of materials or BOM.

Ratio

the relative magnitudes of two quantities (usually expressed as a quotient)

Round

express as a round number

Sectional View

A drawing that shows the interior of an object as it would appear if cut in half or quartered.

Tap

draw from

Translation

the act of changing in form or shape or appearance

Auxiliary View

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.

Break Line

A line used to interrupt a drawing if an object will not fit on a drawing sheet.

Clearance Fit

A group of values that is used to analyze the distribution of data.

Counterbore

a bit for enlarging the upper part of a hole

Detail Drawing

A dimensioned, working drawing of a single part. Also referred to as part drawing.

Formula

something regarded as a normative example

Interference

the act of hindering or obstructing or impeding

Keyway

A slot in a hub or material around a shaft that receives a key.

Phantom Line

A line used to show the alternate positions of an object or matching part without interfering with the main drawing.

Rib

a projecting molding on the underside of a vault or ceiling

Scale

size or measure according to a scale

Spotface

A shallow recess like a counterbore, used to provide a good bearing surface for a fastener.

Working Drawings

Drawings that convey all of the information needed to manufacture and assemble a design.

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