CoroDrill 861 Solid Carbide Drills Provide High Stability

Originally titled 'Solid Carbide Drills Provide High Stability'

Sandvik Coromant’s CoroDrill 861, a range of solid carbide drills for deep hole drilling applications, feature advanced chip management flute geometry and is able to generate small, manageable chips.

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Sandvik Coromant’s CoroDrill 861, a range of solid carbide drills for deep hole drilling applications, feature advanced chip management flute geometry and is able to generate small, manageable chips. This, combined with specially designed point geometry to reduce thrust forces and double-offset margin geometry, helps provide the high stability necessary for drilling deep holes in the most expedient and efficient manner, the company says.
 
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. With these drills, Sandvik provides consistent edge preparation that protects the cutting edge from premature chipping and flaking, thus helping to minimize cost per hole.
 
Using its geometry, CoroDrill 861 produces accurate, deep holes to depths of 12-30 × 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 nonferrous 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, the drill 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, according to the company.
 
In a customer performance trial, using a 0.406” diameter CoroDrill 861 for horizontal drilling operations in alloy steel produced remarkable results. According to Sandvik, drilling to a depth of 5.5” (15 × D), the tool achieved 60 percent higher productivity than a comparable competitor drill (in 30 min. of machining time). The machining feed rate increased from 22 to 36 ipm, resulting in a drilled length of 90 feet, compared with the competitor drill, which completed 55 feet.