Lesson 2.3 Key Terms
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Created by:
froppelt13 on April 12, 2012
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43 terms
Terms | Definitions |
|---|---|
 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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