Mechanical blog

ABSOLUTE TEMPERATURE  The temperature of a substance measured above absolute zero. ABSOLUTE ZERO TEMPERATURE  Temperature at which all molecular motion ceases, according to the kinetic theory of gases. A point which has been determined on the thermodynamic scale (by theoretical considerations) beyond which a further decrease in temperature is inconceivable. This is equal to – 459.6° on the fahrenheit scale and – 273.1° on the centigrade scale. ABSOLUTE TEMPERATURE SCALES  Used for calculating changes in refrigerant vapour pressures. ADIABATIC EXPANSION or COMPRESSION  Expansion or compression where the temperature rises during compression and falls during expansion without any loss of heat to the cylinder walls or absorption of heat from the walls.  ADIABATIC HEAT DROP  The heat energy released and theoretically capable of transformation into mechanical work during the adiabatic expansion of unit weight of steam or other ...

ANGLE PLATE   Right angled metal plate used to secure parts during machining or when taking measurements.  ANVIL  Heavy block on which to hammer and shape metals.  APRON  The function of a lathe apron is to carry the mechanism for sliding and surfacing motions and screw cutting.  BACK GEARS   Gears applied to machine tools to increase the number of speed changes obtainable with a cone or step pulley belt drive.  BASTERED THREAD A screw thread which does not confirm to any recognized standard dimensions. BED  One of the principal parts of a machine tool having accurately machined ways or bearing surfaces for supporting and aligning other movable parts of the machine.  BELL CHUCK  Hollow cylindrical chuck bolted to the main chuck for the purpose of giving additional support to work of awkward shape.  BELT SHIFTER  A flat hardwood strip of suitable length having shifter ...

ACME THREAD GAUGE A gauge used for checking and testing the 29° angle and the width at the end of a thread cutting tool while grinding it. It is also used for setting the tool square with the axis of the workpiece. 29 ° 각도와 너비를 확인하고 테스트하는 데 사용되는 게이지는 나사 절삭 공구 끝을 연마하는 동안 사용됩니다. 공작물의 축 ANGLE PLATES  Some work has to be set at a particular angle to the surface of the table, and this is often effected by bolting it to an adjustable angle plate.  ARDOMETER A type of total radiation pyrometer.  BORING BAR MICROMETER On boring operations, it is often necessary to adjust the cutter setting by a few thousandths of an inch. With this, it is possible to determine exactly the depth of cut taken. CALIPER Instrument used for measuring distances between or over surfaces, or for comparing dimensions of workpiece with such standards as plug gauges, graduated rules etc.  CENTRE SQUARE  is intended for marking the centres of round or squa...