# Lesson 2.3 Key Terms

### 43 terms by froppelt13

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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.

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.

Example: