<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> In the context of machining, a cutting tool or cutter is any tool that is used to remove material from the work piece by means of shear deformation . Cutting may be accomplished by single - point or multipoint tools . Single - point tools are used in turning, shaping, planing and similar operations, and remove material by means of one cutting edge . Milling and drilling tools are often multipoint tools . Grinding tools are also multipoint tools . Each grain of abrasive functions as a microscopic single - point cutting edge (although of high negative rake angle), and shears a tiny chip . </P> <P> Cutting tool materials must be harder than the material which is to be cut, and the tool must be able to withstand the heat generated in the metal - cutting process . Also, the tool must have a specific geometry, with clearance angles designed so that the cutting edge can contact the workpiece without the rest of the tool dragging on the workpiece surface . The angle of the cutting face is also important, as is the flute width, number of flutes or teeth, and margin size . In order to have a long working life, all of the above must be optimized, plus the speeds and feeds at which the tool is run . </P> <P> Linear cutting tools include tool bits (single - point cutting tools) and broaches . Rotary cutting tools include drill bits, countersinks and counterbores, taps and dies, milling cutters, reamers, and cold saw blades . Other cutting tools, such as bandsaw blades, hacksaw blades, and fly cutters, combine aspects of linear and rotary motion </P>

What is the material of cutting tool used in lathe machine