Unit One Vocab A-B Flashcards
Abrasive
A material used to cutt other materials softer than itself
Allowance
The minimum clearance (or max) between two mating parts, such as a shaft and a hole
MMC Hole - MMC Shaft = Allowance
Alloy
A mixture of two or more elements - at least one of which is metallic melted together to form a new material
Angular Dimension
A dimension measured in degrees, minutes and seconds
Anneal
The process of slowly cooling hot iron-based metals to remove stresses and reduce the hardness
Arbor
A shaft upon which a cutting tool is mounted, or a spindle for holding the workpiece.
Assembly Drawing
A drawing that shows the relationships of the various components as they fit together.
Auxiliary View
An orthographic view projected angularity, used to show features appearing on inclined or oblique surfaces
Oblique: A plane not perpendicular to any of the principle planes.
Axis
A center line about which parts are symmetrically arranged that may or may not revolve upon it.
Baseline Dimensioning
A system of dimensioning used to locate features of a part from a common set of datums
Basic Dimension
An exact value used to describe the size, shape or location of a feature without tolerance.
Basic Size
The exact theoretical size from which limits size are derived by the application of allowances and tolerances.
Bevel
A flat, slanted surface between two other surfaces at right angles to one another.
Bilateral
Used to indicate that two sides are involved (bilateral tolerances too)
Blind Hole
A hole that does not pass all the way through (common in thick material)
Bolt Circle
A circular center line upon which two or more hole centers are used
concentrically- common center
coordinately- placed
Bore
To enlarge a hole to an accurate size. Held to close tolerances, it is usually specified with limit dimensions.
Boss
A raised, cylindrical projection used to provide extra metal around a hole in a casting or forging. The BOSS and the pad are similar, except that the boss is always circular and PAD can be any other shape.
Broach
To produce a desired shape inside a cylindrical hole, such as a key-way or hexagon. The broaching tool has a series of teeth, gradually increasing in size, that do the cutting as the tool is pushed or pulled through the hole.
Burnish
To finish or polish metal by rolling or sliding a tool over the surface under pressure.
Burr
A jagged edge of metal produced by working the metal. A common note on a blueprint is to “remove all burrs”
Bushing
A replaceable insert to provide metal with better wearing quality.
