- Aramid fiber
- A synthetic product used as a reinforcing agent in Brake linings. Aramid fiber has impressive wear properties.
- Arbitrary
-
- Charge in addition to regular freight charge to compensate for unusual local conditions.
- Fixed amount accepted by a carrier when dividing joint rates.
- Arbor
-
- A rotating shaft in a lathe or drill.
- Cylindrical or conical shaft on which a cutting tool or part to be machined is mounted.
- The axis or shaft upon which a rotatable part is mounted the shaft upon which a gear or wheel is mounted.
Also see
- Arc
-
- The discharge of electric Current across a gap of two Electrodes. The term given to the flow of electricity through a gaseous space or air gap.
- A welding term referring to the flow of electricity through the air which produces high temperatures.
- ARC
-
- Acronym for Aeronautical Research Council in the UK.
- Acronym for Ames Research Center in the USA
- Acronym for Automatic Ride Control
- Arc blow
- A welding term referring to the tendency for an arc to wander or whip from its normal course during arc welding. It is caused by magnetic changes.
- Arc crater
-
- Depression formed in electrodes between which an electric arc has been maintained.
- In arc welding, the depression which occurs in the weld metal.
- Arc cutting
- A welding term referring to making a kerf in a metal using the energy of an electric arc.
- Arch culvert
- Bridge feature that resembles the top half of a large tube. The arch shape makes it easier for fish to swim down the creek that passes under the arch.
- Architectural acoustics
- The study of how sound is transmitted and received in various parts of a building or even a vehicle, thus involves the placement of speakers.
- Arcing
-
- The action of electricity when it leaps the gap between two
Electrodes. Usually causes
premature wear of breaker points.
Also see
- A faulty paint spraying technique where the spray gun is not moved along the panel surface at a uniform distance. Instead it is moved toward the panel when starting and moved away toward the end of the panel. The result of this technique is an uneven application of paint.
- A process where the brake shoes are ground to the proper curvature for the drums they are to be used with. Modern brake shoes are pre-arced.
- The action of electricity when it leaps the gap between two
Electrodes. Usually causes
premature wear of breaker points.
- Arc of approach
- The arc on the Pitch circle of a gearwheel over which two teeth are in contact while approaching the pitch point
- Arc of contact
- The arc on the Pitch circle of a gearwheel over which two teeth are in contact.
- Arc of recess
- The arc on the Pitch circle of a gearwheel over which two teeth are in contact while receding from the pitch point.
- Arc suppressor
- A device for automatically grounding the neutral point of an insulated-neutral transmission or distribution line if an arc to ground occurs. Also called arcing-ground suppressor
- Arc welding
- Welding by using an electric Current to melt both the metal to be welded and the welding rod or Electrode that is being added.
- Arm
- A part attached to or projecting from something.
Also see
- A-arm
- Actuator arm
- Adjustable rocker arm
- Ball joint rocker arm
- Breaker arm
- Branch
- Check arm
- Brush-holder arm
- Contact arm
- Control arm
- Crankarm
- Door check arm
- Drop arm
- Flex arm suspension
- Forked rocker arm
- High lift rocker arm
- Idler arm
- Knuckle arm
- Lateral arm
- Leading arm
- Long and short arm suspension
- Pitman arm
- Radius arm
- Rocker arm
- Rocker arm cover
- Rocker arm shaft
- Rotor arm
- Semi-trailing arm
- Stay
- Steering arm
- Steering gear arm
- Steering knuckle arm
- Throttle arm
- Tie rod arm
- Torque arm
- Track control arm
- Trailing arm
- Transverse arm
- Armature
-
- In a Relay, Regulator, Horn, etc., it is the movable part of the unit which indicates the presence of electric current as the agent of actuation.
- Piece of low-reluctance ferromagnetic material (keeper) for temporarily bridging the poles of a permanent magnet, to reduce the leakage field and preserve magnetization.
- In a Starter or Generator, it is the portion that revolves between the Pole shoes, made up of wire windings of copper on an iron Core or axle. When it revolves, an electric Current is induced.
- Part of an electric motor, generator, or other device moved by magnetism
- The wooden, metal, or hard-foam supporting structure under a clay model.
Also see
- Armature brake
- A mechanical or electrical component in a starter used to stop the armature movement after the starter motor has been switched off.
- Armature end plate
- The end plate of a laminated armature core. It is of sufficient mechanical strength to enable the laminations to be clamped together tightly to prevent vibration. Also called Armature head
- Armature reaction
- The electrical current that flows in the armature winding of a DC motor tends to produce magnetic flux in addition to that produced by the field current. This effect, which reduces the torque capacity, is called armature reaction and can affect the commutation and the magnitude of the motor's generated voltage
- Armature relay
- A relay operated electromagnetically, thus causing the armature to be magnetically attracted.
- Armature winding
- The complete assembly of conductors carried on the armature and connected to the commutator or to the terminals of the machine.
- Armor plate
- Traditionally, specially heavy alloy steel plate hardened on the surface; used for the protection of fighting vehicles and ships. There is also a form of armor plate based on aluminum alloy particularly suitable for fast moving military vehicles.
- Armrest
- A projection upon which the occupants can rest or support their arms. Usually located on the door panel and sometimes in the center of the front seats or the center of the rear seat.
- Armstrong
- A colloquial term for manual steering. Without power assist, steering will need a strong arm, thus the name.
- Armstrong-Siddeley
- A vehicle brand of which the 1924-1933 Model 30 and 1933-1939 Special with required application are classic cars.
- Arnolt Bristol
- A vehicle brand of which the 1952-62 models are milestone cars.
- A road
-
- Road designation used in Britain
- They do not have controlled access like M roads
- they range from one-lane roads to two-lane divided highways called "dual carraigeways"
- They are the main routes between towns
- Road designation used in Britain
- Aromatics
- Hydrocarbons based on the ringed six-carbon benzene series or related organic groups. Benzene, toluene and xylene are the principal aromatics, commonly referred to as the BTX group. They represent one of the heaviest fractions in gasoline. They are called aromatics because many of their derivatives have sweet or aromatic odors.
- Arrester
- A device which prevents a certain action. For example, a
Spark arrester is a special pipe
mounted in the end of the Exhaust
pipe which prevents any burning gasses from coming out with the
possible danger of igniting any combustibles in the area (i.e.,
setting the forest on fire).
Also see
- ARS
-
- Acronym for Air Ride Suspension -- a suspension system in which the load is supported on air-filled rubber bags rather than steel springs. The engine's air compressor fills the reservoir tanks which supplies air for the suspension and the air brake system.
- Acronym for Automatic Restraint System
- Arterial highway
- A major thoroughfare, used primarily for through traffic rather than for access to adjacent land, that is characterized by high vehicular capacity and continuity of movement.
- Articulated
- Jointed. An articulated rod is made of two sections with a
moveable Joint which permits its shape
to go from perfectly straight to right angle.
Also see
- Articulated bus
-
A large public passenger bus, usually more than 55 feet in length, with two connected passenger compartments with an accordion-like section between them which flexes or bends to allow the bus to turn sharply around curves or corners as it bends at that part of the bus.
Articulated bus
- Articulated mounting
- A term used where parts are connected by links and links are anchored to provide a double hinging action.
- Articulated Pistons
- Two-piece pistons incorporating an entirely separate piston crown or dome with a separate skirt, and linking the two together with the piston pin. Many 1994 and later engines incorporate steel crown/aluminum skirt articulated pistons.
- Articulation
-
- The space between the power unit and trailer that allows the combination to pivot and turn corners.
- The ability of one axle to move -- left wheel up, right wheel down or vice versa -- relative to the chassis or its corresponding axle. It is a measure of the ease with which off-road wheels can maintain traction and control in excessively rough terrain.
- Artificial aging
- The method of speeding up the process of hardening by subjecting the substance (e.g., aluminum alloy) to a change in temperature or pressure.
- Artificial antenna
- An electrical unit which simulates an antenna without actually transmitting or receiving a signal. It is used to check or test radios and transmitters.