Broach
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A broach is a series of chisel points mounted on one piece of steel. A broach is typically used to enlarge a circular hole into a larger noncircular shape such as a square or other desired shape. Another typical use of a broach is to cut splines or a square keyway on objects such as gears, driveshafts, pulleys etc. The amount of material removed by each broach tooth (or chisel) varies with the material being cut. A broach designed to cut steel might remove only 0.05 mm (0.0025 inch), while a broach designed to cut brass might remove as much as 0.10 mm (0.004 inch). The succession of chisels removes the total amount of material required. A broach might be designed to be pushed through an existing hole, or, alternatively to be pulled through the hole. Broaching machines are designed to either push or pull a broach.