# Lesson 2.3 Key Terms

### 45 terms by 15cyinger

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### Assembly

The act of constructing something (as a piece of machinery).

### Assembly drawing

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

### 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.

### Balloons

A circled number identifying each part shown in an assembly drawing. Also called a ball tag or bubble number.

### Blind Hole

A hole that does not go completely through the workpiece.

### Broken Out Section

A section of an object broken away to reveal an interior feature for a sectional drawing.

### Chamfer

Two surfaces meeting at an angle different from 90 degrees.

### Clearance Fit

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

### Component

Something determined in relation to something that includes it.

### Constraint

Limitation or restriction.

### Counterbore

A bit for enlarging the upper part of a hole.

### Countersink

A hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface.

### 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.

### Degree of freedom

One of the minimum number of parameters needed to describe the state of a physical system.

### Detail Drawing

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

### Documentation

Program listings or technical manuals describing the operation and use of programs.

### Exploded Assembly

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

### Fillet

A rounded interior blend between two surfaces. Some uses are to strengthen joining surfaces or to allow a part to be removed from a mold.

### Foreshorten

Reduce in scope while retaining essential elements.

### Formula

A standard procedure for solving a class of mathematical problems.

### Full Section

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

### 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.

### Interference

The act of hindering or obstructing or impeding.

### Key

A rectangular or semicircular shape used to prevent parts, such as gears or wheels, from turning on a shaft.

### Keyseat

A slot in a shaft to receive a key.

### Keyway

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

### Parameter

A constant in the equation of a curve that can be varied to yield a family of similar curves.

### 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.

### Parts List

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

### Phantom Line

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

### Ratio

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

### Rib

A relatively thin flat member acting as a brace support. Also called a web.

### Rotation

A single complete turn (axial or orbital).

### Round

Having a circular shape.

### Scale

Size or measure according to a scale.

### Section Lines

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

### Sectional View

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

### Spotface

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

### Subassembly

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

### Tap

Draw from or dip into to get something.

### Taper

The property possessed by a shape that narrows toward a point (as a wedge or cone).

### 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.

### Translation

The act of uniform movement.

### Working drawings

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

### Break Line

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

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