CoroDrill 861 Deep Hole Drills

The CoroDrill 861 features Advanced Chip Management (ACM) flute geometry to generate small, manageable chips. This, combined with specially designed point geometry to reduce thrust forces and patented double-offset margin geometry, helps provide the high stability necessary for drilling deep holes in the most expedient and efficient manner.

Effective chip evacuation is critical when deep hole drilling. The buildup of heat and friction resulting from an accumulation of chips can impact productivity and tool life, even leading to drill breakage and downtime in some instances.

CoroDrill 861 produces accurate, deep holes to depths of 12 to 30 x drill diameter, without pecking. Using a suitable high-precision chuck, IT8-IT9 is the achievable hole tolerance in workpiece 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 0.4-in. diameter CoroDrill 861 for horizontal drilling operations in alloy steel produced remarkable results.