The preparatory function G 90 for Absolute mode.
G90 - Absolute mode of dimensioning.
G91 - Incremental mode of dimensioning.
6) The preparatory function G 90 for
Absolute mode
Related Diploma CET Mechanical Question Paper - 2013 with Answer Key
Anode
Electro Discharge Machining (EDM) In electro discharge machining the metal is removed by erosion caused by rapidly recurring spark discharges between the tool (cathode) and work (anode) separated by flooded dielectric fluid through a small gap.
The dielectric is used to control the spark discharges, to help in the movement of the sparks and to act as coolant. The tool is made of cast iron, brass, copper and copper tungsten alloy. The electro discharge machining can machine hardest materials and produces high degree of surface finish.
In EDM process the work piece is connected to Anode and the electrode connected to the cathode.
LBM
Laser Beam Machining (LBM) is used for machining very small holes and cutting complex profiles in thin and hard materials like ceramics.
Upper most part of the flask
In foundry work, the terms cope and drag refer respectively to the upper and lower parts of a two-part casting flask, used in sand casting. The flask is a wood or metal frame, which Cope And Drag Pattern contains the molding sand, providing support to the sand as the metal is poured into the mold. In flaskless molding, the same terms are used, cope for the top or upper piece and drag for the bottom or lower piece.
In some cases the part design is more complicated, and intermediate flasks and mold sections are needed between the cope and drag. These sections are called cheeks.