Sandvik Coromant introduces next-generation in deep hole drills – CoroDrill 861

Effective chip evacuation is critical when deep hole drilling. The build up of heat and friction resulting from an accumulation of chips can impact on productivity and tool life, even leading to drill breakage and downtime in some instances. With CoroDrill 861, Sandvik Coromant provides consistent edge preparation that protects the cutting edge from premature chipping and flaking, thus helping to minimize cost-per-hole.

Using its innovative geometry, CoroDrill 861 produces accurate, deep holes to depths of 12-30 x drill diameter, without pecking. Using a suitable high precision chuck, H8-H9 is the achievable hole tolerance in workpieces materials in the steel, stainless steel, cast iron and non-ferrous metal application areas. Internal coolant holes deliver coolant directly to the tip of the drill even at deep drilling depths, further aiding precision and chip evacuation. As well as conventional drilling, CoroDrill 861 is capable of producing cross-holes, and holes in angled faces, making it highly desirable for automotive powertrain shops producing components such as crankshafts, engine blocks and cylinder heads.

In a customer performance trial, using a 10.3 mm diameter CoroDrill 861 for horizontal drilling operations in alloy steel produced remarkable results. Drilling to a depth of 140 mm (15xD), the tool achieved 60 per cent higher productivity than a comparable competitor drill (in 30 minutes’ machining time). With machining feed rate increased from 561 to 917 mm/min, , CoroDrill 861 demonstrated an impressive drilled length of 27.5 m, compared to the competitor drill, which completed 16.8 m.