Lesson 2.3 Key Terms

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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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