using abrasive slurry between the tool and work
direct contact of tool with the work
maintaining an electrolyte between the work and tool in a very small gap between the two
erosion caused by rapidly recurring spark discharges between the tool and work
electro-chemical machining
electro-discharge machining
ultra-sonic machining
none of these
aluminum oxide
boron carbide
silicon carbide
any one of these
tungsten carbide
brass or copper
diamond
stainless steel