SPECIALIZED VOCABULARY

*Air belt

the chamber which equalizes the pressure that is blasted into the cupola at the tuyures.

*Air brake

an energy-conversion mechanism activated by air pressure and used to retard,stop,or hold a vehicle or,generally,any moving element.

*ball bearing

an antifriction bearing permitting free motion between moving and fixed parts by means of balls confined between outer and inner rings.

*Chamshaft

a rotating shaft onto which one or more irregularly shaped parts(cams) are fitted.the cams give a reciprocating motion to mechanical parts in contact with them. A camshaft is used to operate the valves of an internal-combustion engine.

*Chain wheel

a toothed disc that connects with a roller chain and transmits motion when it rotates.

*clutch

a device that joins together or disconnects two revolving shafts, as required. He clutch in a motor vehicle transmits the drive from the engine to the gearbox.

*Chuck

a device with adjustable jaws,used to hold a workpiece in a lathe or a tool in a drilling machine.

*cylinder-head gasket

the gasket used toseal the cylinder head of an engine to the cylinder block.

*disc brake

an efficient type of brake in which two pads

(brake pads) close onto a disc attached to the wheel hub.

*emery wheel

a grinding wheel consisting of emery powder bonded with a resinous material.

*exhaust valve

see internal-combustion engine.

*flame cutting

a method of cutting metal using a blowtorch.

*gearbox

a train of gear wheels and its housing;e.g. The device in a motor vehicle that drives the propeller shaft at a suitable speed.

*gudgeon pin

a cylindrical bar used to secure a piston to the small end of a connecting rod.

*grinding wheel

an abrasive wheel used for grinding. It may be manually or mechanically driven.

*half round file

a file that in cross section has one flat and one rounded face.

*half shaft

a splined shaft in a motor vehicle that carries the drive from the differential gear to the driving wheel.

*house clip

a clip used to attach a hose to a source of water supply.

*hydraulic jack

a device used to raise heavy weights short distances.it is operated by liquid pressure.

*mole wrench

a type of wrench in which the jaws can be clamped in any position.

*milling machine

a machine toolused for milling metal objects to smooth or shape them.

*nut

a square or hexagonal ring of metal with an internal screw thread enabling it to be screwed nto a bolt.

*philips screwdriver

a screwdriver with a cross-shaped point for use with philips screws.

*pincers

a tool wth curved bevelled jaws,used for extacting nails.

*pipe wrench

an adjustable spanner with serrated jaws,used to turn pipes or rods.

*ring spanner

a spanner with a notched ring that exactly fits around the nut to be turned.

*timing chain

a chain that drives the camshaft from the crankshaft in an internal-combustion engine.*water-cooled engine

an engine that cooled by the circulation of water through pipes surrounding the engine.