Form and Function Unit Test Flashcards

Vocabulary flashcards covering design for manufacturing, manufacturing processes, fits, tolerances, stack-ups, and geometric dimensioning and tolerancing (GD&T) based on the unit test study list.

Design for Manufacturing Goal

To make items quick and cheap.

Scaled down prototype

A model used for larger scale items like planes or rockets.

Forming

A process that uses force to shape metals; includes rolling, extrusion, and forging.

Casting

A process that pours molten metal into a die made of sand, metal, or wax.

Molding

A process that supplies melted plastic into a mold via methods like injection, extrusion, rotational, or blowing.

Machining

A process that cuts a workpiece into a desired form using a controlled removal process.

Joining

A method that combines multiple components into a larger assembly.

Additive Manufacturing

A process that builds objects in layers.

Machinery's Handbook

The source used to get information about different types of fits.

Tolerance

The acceptable variation in a dimension.

Clearance Fit

A type of fit represented by $(++)$.

Interference Fit

A type of fit represented by $(--)$.

Transition Fit

A type of fit represented by $(+-)$.

Loose Tolerances

Used for low manufacturing costs and easy assembly.

Tight Tolerances

Used for improved interchangeability and functionality.

Excel (for stack-ups)

Ideal software for stack-ups to minimize errors and allow for changing numbers.

Engagement Stack-up

A type of stack-up with a negative $(-)$ sign.

Spring Deflection Stack-up

A type of stack-up with a negative $(-)$ sign; it starts and ends in the same spot and begins with spring free length.

Clearance Stack-up

A type of stack-up with a positive $(+)$ sign.

Orientation

The most important step in conducting a stack-up.

Statistical Tolerance

Calculated on a stack-up when there are 7 or more dimensions using $ext{sqrt}( ext{…})$ ($ext{RSS}$).

FCF

Feature Control Frame; considered the most important symbol in geometric tolerancing.

DRF

Datum Reference Frame; used to allow constraints for measurement.

Volcano block

The method used to specify datums.

Straightness

A form tolerance for individual features.

Flatness

A form tolerance for individual features.

Circularity (Roundness)

A form tolerance for individual features.

Cylindricity

A form tolerance for individual features.

Profile of a Surface

A profile tolerance for individual or related features.

Profile of a Line

A profile tolerance for individual or related features.

Angularity

An orientation tolerance for related features.

Perpendicularity

An orientation tolerance for related features.

Parallelism

An orientation tolerance for related features.

Position

A location tolerance for related features.

Concentricity

A location tolerance for related features.

Symmetry

A location tolerance for related features.

Circular Runout

A runout tolerance for related features.

Total Runout

A runout tolerance for related features.