Sandvik Coromant CoroDrill 870 produces chamfered holes in a single operation

Designed for ISO P (steel) and ISO K (cast iron) materials, CoroDrill 870 is an exchangeable tip range that now offers an insert-based 45° chamfer drill as part of the Tailor Made D275 family. The CoroDrill 870 chamfer drill provides an option of one or two chamfer inserts depending on requirements. The use of two chamfer inserts produces thinner chips, and as a result is recommended for medium or high feed applications, in unstable conditions or where a large chamfer width is needed. Conversely, a single chamfer insert delivers a thicker chip and thereby gives better chip breakage in stable, low feed or small chamfer width applications. It is recommended that the same feedrate is used when the chamfer insert is cutting, particularly when drilling a blind hole because a reduction in feed can result in undesirably long chips. A range of insert sizes is available.