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A Subland Core Drill is basically two core drills of different diameters combined into one tool, retaining the individual characteristics and proper geometry for each diameter. The independent flutes and margins of a Subland Core Drill ensure that size and concentricity between diameters is maintained throughout the life of the tool and is not affected by re-sharpening the point or step angles.
The Subland Core Drill eliminates secondary operations by drilling multi-diameter holes in one production pass. On certain applications particularly holes in steel or cast iron, the Subland Core Drill provides superior tool life compared to that of a basic Step Core Drill. When drill bushings are used "Double Margins" can be supplied for greater stability. The additional margins will give maximum support and guidance to provide more accurate size and hole location.
Subland Core Drills provide better hole size control and surface finish than two flute drills due to the additional cutting edges. The three or four lands provide superior guiding support, have a thicker web, and may be used with heavy feed rates. All Subland Core Drills are manufactured to meet specific requirements with the specified lead angle, end sharpening, number of flutes, etc.
Subland Cored Drills eliminate operations by drilling two diameter holes as core drill chamfer, core drill counterbore, etc. in one production step. Subland Core Drills are used to enlarge existing holes for better tolerance control and surface finish. This tool style can also be used for rough or finish reaming when hole tolerances and surface finish permit.