Term
| A material used to cut other materials softer than itself. |
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Definition
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Term
| The minimum clearance between 2 mating parts. |
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Definition
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Term
| A mixture of 2 or more elements, at least one of which is metalic, melted together toform a new metal. |
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Definition
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Term
| A dimension measured in degrees, minutes, and seconds. |
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Definition
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Term
| The process of slowly cooling hot iron-based metals to remove stresses and reduce the hardness. |
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Definition
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Term
| A shaft upon which a cutting tool is mounted, or a spindle for holding the workpiece. |
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Definition
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Term
| A drawing that shows the relationship of the various components as they fit together. |
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Definition
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Term
| An orthographic view projected angularly, used to show features appearing on inclined or oblique surfaces. |
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Definition
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Term
| A central line about which parts are symmetrically arranged that may or may not revolve upon it. |
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Definition
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Term
| A system of dimensioning used to locate features of a part from a common set of datums. |
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Definition
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Term
| An exact value used to describe the size, shape, or location of a feature without tolerance. |
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Definition
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Term
| The exact theoretical size from which limits of size are derived by the application of allowances and tolerances. |
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Definition
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Term
| A flat, slanted surface between 2 other surfaces at right angles to one another. |
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Definition
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Term
| Since "bi" means 2, it is used to indicate that 2 sides are involved. |
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Definition
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Term
| A hole that does not pass all the way through. |
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Definition
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Term
| A circular center line upon which 2 or more hole centers are located. |
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Definition
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Term
| To enlarge a hole to an accurate size. Held to close tolerances, it is usually specified with limit dimension. |
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Definition
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Term
| A raised, cylindrical projection used to provide extra metal around a hole in a casting or forging. |
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Definition
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Term
| To produce a desired shape inside a cylindrical hole, such as a keyway 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. |
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Definition
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Term
| A replaceable insert to provide metal with better wearing quality. |
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Definition
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Term
| To finish or polish metal by rolling or sliding a tool over the surface under pressure. |
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Definition
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Term
| A jagged edge of metal produced by working the metal. A common note on a blueprint is to "remove all burrs". |
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Definition
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Term
| A drawing created by computer aided drafting methods. |
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Definition
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Term
| A mechanical devise used to change rotary motion to some other motion, such as reciprocating or sliding. |
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Definition
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Term
| Heating low-carbon steel to a temperature below its melting point in carbonaceous solids, liqids, or gases to raise the elvel of carbon in the exterior, then cooling slowly in preparation for heat-treating. Abbreviated CARB. |
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Definition
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Term
| To harden ferrous alloy so that the surface layer is harder than the interior core. |
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Definition
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Term
| A metal object made by pouring molten metal into a mold. |
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Definition
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Term
| Successive dimensions that extend from one featre to another, rather than each originating at a datum. Tolerances accumulate with chain dimensions. |
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Definition
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Term
| A corner that has been removed from the end of a cylindrical surface, at an angle to the face. Used to facilitate assembly. |
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Definition
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Term
| A hole slightly larger than the bolt or fastener that is intended to pass through it. |
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Definition
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Term
| Coaxiality and cylindrical features exists when 2 or more cylindrical features have a common axis. |
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Definition
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Term
| A projecting ring around a shaft. |
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Definition
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Term
| The condition where the median points of a feature's diametrically opposed elements are located within a cylindrical zone that is equally centered about a datum axis. |
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Definition
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Term
| The part of a mold that shapes the interior of a casting. |
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Definition
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Term
| To enlarge a hole cylindrically at the end. A drawing specification will include its diameter and depth. |
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Definition
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Term
| To enlarge a hole conically at the end to accept a flatheaded fasterner. A drawing specification will include its diamter and included angle. |
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Definition
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Term
| A point, line, surface, or plane from which the location of other features is established. |
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Definition
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Term
| A unit of angular measurement. There are 360 degrees in a circle. |
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Definition
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Term
| A drawing of a single object, complete with dimensions and all other information necessary to produce the part. |
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Definition
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Term
| A tool used to cut external threads. Also a tool used to shape, mold, stamp, or cut metal. |
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Definition
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Term
| A metal object produced by injecting molten material into metal dies under pressure. |
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Definition
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Term
| The angle provided on a pattern or mold that enables the pattern or molded part to be easily withdrawn from the mold. |
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Definition
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Term
| The term means off center. |
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Definition
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Term
| A metal object made by forcing hot or cold material through dies of the desired shape. |
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Definition
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Term
| To machine a flat surface perpendicular to the axis, such as the end of a shaft. |
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Definition
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Term
| A connector used to secure 2 or more parts. Bolts, nuts, screws, and rivets are types of fasteners. |
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Definition
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Term
| Metals that contain iron s their base material, such as steel. |
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Definition
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Term
| A concave surface (interior radius) at the intersecton of 2 surfaces of an object. |
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Definition
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Term
| A thin projecting edge on cast or molded parts. |
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Definition
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Term
| Symbols appearing on the edge view of surfaces to be machined. Usually confined to drawings of castings and forgings. |
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Definition
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Term
| A device designed to postion and hold a part in a machine tool. It does not guide the cutting tool. |
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Definition
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Term
| A process of hardening steel by heating with an oxy-acetylene torch and quenching. |
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Definition
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Term
| A projecting rim or collar on an object. It may include mounting holes to secure it in place. |
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Definition
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Term
| To force hot metal into a desired shape by hammering or squeezing. |
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Definition
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Term
| A measuring instrument such as a gage block or a height gage. |
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Definition
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Term
| The thickness of sheet metal or the diameter of wire designated by a number rather than dimension. |
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Definition
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Term
| Tolerances on drawings with emphasis on the actual function or relationship of part features where interchangeability is critical. |
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Definition
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Term
| An angular piece of metal fastened in the angle of a metal frame to give strength or stiffness. |
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Definition
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Term
| A test that measures the degree of harness of metals. |
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Definition
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Term
| The applications of heat to metals to produce desired properties. |
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Definition
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Term
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Definition
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Term
| The central part of a wheel, such as the part into which the spokes are inserted. |
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Definition
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Term
| A flat surface slanting in one direction. It will appear as an edge in one principal view, distorted in others. |
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Definition
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Term
| The angle formed between one side and another, always less than 180 degrees. |
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Definition
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Term
| A three-dimensional pictorial drawing that has its horizontal surfaces drawn on 30 degree axes from horizontal. |
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Definition
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Term
| A device designed to hold a part to be machined. It also positions and guides the cutting tool. |
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Definition
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Term
| A metal bar or wedge used to secure gears or pulleys to a shaft and prevent rotary motion between the 2 pieces. |
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Definition
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Term
| An axially located groove in a shaft that positions the key. |
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Definition
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Term
| An axially located groove in a hub that positions the key. |
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Definition
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Term
| To produce a surface finish by use of a soft metal impregnated with a fine abrasive powder. |
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Definition
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Term
| When a feature contains the minimum amount of material. Abbreviated LMC. |
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Definition
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Term
| The maximim and minimum permissible dimensions. Arrived at by applying tolerances to basic dimension. |
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Definition
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Term
| A dimension measured in a straight line. |
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Definition
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Term
| When a feature contains the maximum amount of material. Abbreviated MMC. |
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Definition
| MAXIMUM MATERIAL CONDITION |
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Term
| An external groove cut in a cylindrical piece at a change in diameter, usually where another part is to fit against a shoulder. |
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Definition
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Term
| A term used for the purpose of general identification. |
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Definition
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Term
| Metals that do not contain iron, such as brass, bronze, and aluminum. |
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Definition
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Term
| The process of heating steel, then cooling in still air to room temperature to restore uniform grain structure and relieve internal stresses. |
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Definition
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Term
| A flat surface slanting in 2 directions. It will appear distorted in all principal views. |
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Definition
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Term
| The process of projecting the essential views of a 3-dimensional object onto a flat plane, such as a piece of paper. This process is used for machinist's blueprints. |
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Definition
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Term
| A raised projection on a casting. Used to provide extra metal around a series of holes or slotted hole. |
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Definition
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Term
| Extending in the same direction, such as 2 lines, everywhere equidistant, and not meeting. |
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Definition
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Term
| A model, made of wood, metal, or other material, used to form a cavity in the sand for pouring castings. |
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Definition
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Term
| Being at a right angle to a given line or plane. |
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Definition
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Term
| To remove stains or oxide scale from parts by immersion in an acid solution. |
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Definition
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Term
| The smaller of 2 mating gears. |
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Definition
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Term
| The distance from a point on a thread to a corresponding point on the next adjacent thread measured parallel to the axis. |
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Definition
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Term
| The view that most clearly illustrates the shape of a feature. |
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Definition
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Term
| Cooling metals rapidly by immersing them in water, oil, brine, or air. |
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Definition
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Term
| The distance from the center of a circle or an arc to its circumference. Equal to one-half a diameter. |
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Definition
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Term
| A machine operation consisting of enlarging ahole slightly with a rotating fluted tool to provide greater accuracy, and better finish. |
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Definition
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Term
| A strainght-line, back-and-forth motion. To move in alternate directions. |
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Definition
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Term
| Used only for inforamtional purposes. Does not receive the standard print tolerance and should not be used for production or inspection. |
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Definition
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Term
| The condition where tolerance of position or form must be met irrespective of where the feature lies within its size tolerance. Abbreviated RFS. |
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Definition
| REGARDLESS OF FEATURE SIZE |
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Term
| The amount one plane surface of a piece is set below another plane, usually for clearance. |
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Definition
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Term
| A relatively thin, flat member acting as a brace or support. |
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Definition
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Term
| A convex surface at the intersection of 2 surfaces of a casting or forging. |
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Definition
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Term
| Refers to the relative size of the drawing and the size of the part. The first number represents the size of the drawing and the second number the size of the part. Dimensions always represesnt the size of the part, not the print. |
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Definition
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Term
| An interior view of an object, drawn to expose features not otherwise visible. |
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Definition
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Term
| A surface or edge having nothces or shart teeth is said to be serrated. |
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Definition
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Term
| A thin piece of metal or other material placed between 2 partsto adjust the fit. |
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Definition
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Term
| A plane surface on a shaft, normal to the axis and formed by a difference in diameter. |
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Definition
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Term
| A raised area on a shaft (external) or hub (internal) parallel to the axis, and designed to fit into a recessed area of a mating part. |
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Definition
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Term
| To machine a round spot on a rough surgace, usually around a hole, to give a good seat to a nut or bolthead. Abbreviated SF or SFACE. |
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Definition
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Term
| Basically springs fall into 2 categories: helical or flat. The 3 most common helical springs are: compression, extension, torsion. |
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Definition
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Term
| A helical spring that tends to supply formce when compressed, either in a hole or around a rod. |
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Definition
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Term
| A helical spring that tends to supply force when it is extended. Contains hooks on each end for connections. |
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Definition
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Term
| A helical spring that is designed to resist twisting or rotary motion. Contains hooks or projections for connections. |
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Definition
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Term
| A round piece of metal threaded on both ends. |
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Definition
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Term
| Roughness refers to the finely spaced irregularities produced in fabricating a part. The height of the irregularites is rated in microinches or micrometers. |
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Definition
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Term
| The same on each side. Equal halves. A center line usually indicates symmetry. |
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Definition
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Term
| A type of dimensioning where letters are substituted for dimensions that are listed in a table on the drawing. This permits more than one part to appear on the same drawing. |
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Definition
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Term
| A line drawn to the surgace of an arc or circle so that it contacts the arc or circle at only one point. |
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Definition
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Term
| A tool for cutting threads in a hole drilled to a particular size for the threading operation. |
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Definition
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Term
| Conical shape that permits a shaft or a hole to become gradually smaller at one end. |
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Definition
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Term
| To change the physical characteristics of hardened steel by reheating to an intermediate temperature ranger for the purpose of toughening the steel. Also has a softening effect. |
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Definition
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Term
| A thin sheet used as a guide for the form and shape of the piece to be made. |
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Definition
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Term
| Permissible variation from a given dimension. |
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Definition
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Term
| Total amount of variation allowed for a specified dimension. |
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Definition
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Term
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Definition
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Term
| A term used with drawing dimensions to indicate that all similar undimensioned features are intended to have the same dimension as the one marked TYP. |
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Definition
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Term
| A groove cut on the inside of another cut (ex. a hole). |
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Definition
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Term
| Having only one, or one side only. |
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Definition
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Term
| To strike a piece of metal until it becomes greater in its cross section. To hammer metal into a different shape. |
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Definition
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Term
| Perpendicular to the horizon from the horizontal plane. |
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Definition
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Term
| A flat key, semicircular in shape. The 2 basic dimensions are coded into the key number. The last 2 digits designate the diameter in 1/8th of an inch. The preceding digits designate the width in 1/32nds of an inch. |
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Definition
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