Spline Broach is an instrument for cutting and sizing

A cutting tool is any tool that is used to remove material from the work-piece by means of shear deformation. Cutting tools must be made of a material 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 work-piece without the rest of the tool dragging on the work-piece surface. Cutting tools are made using a variety of materials and the selection of a cutting tool material depends on a variety of factors, like hardness and toughness.

Gear cutters are the cutters that are used to provide the shapes to the gears. The main function of gear cutters is to remove the material from the machine by their movement within the machine. A Gear shaper cutter is a gear cutter that has teeth, which is relieved for providing appropriate cutting edges and clearances. Shaving cutters are the gear cutters used to impart a shaving finish to the instruments and have numerous cutting teeth on their periphery, to perform the function.

Special cutters are the cutters specially designed to perform some specific tasks. Special cutters are unique and can perform one set of functions over the fix set of machinery. Some special cutters are like, shapers cutters, spline hobs, worm wheel hobs etc.