New Sandvik Coromant CoroDrill 862 provides outstanding micro-drilling performance

The innovative surface engineering on CoroDrill 862 combines with specially designed point geometry to reduce thrust forces and promote fast and efficient chip removal. This is aided further by Advanced Chip Management flute geometry which makes the chips small and manageable. Evacuating chips when micro-drilling is vital as even the smallest accumulation can lead to problems such as drill breakage, loss of precision, downtime and scrap. The Sandvik Coromant CoroDrill 862 provides good hole entry and exit, and achievable hole tolerance of H8-H9. Internal coolant holes deliver coolant directly to the tip of the drill, even at deep drilling depths, to further assist precision and chip removal.

In a customer trial based on a gear wheel machined from alloy steel, a 2 mm diameter CoroDrill 862 cutting to a depth of 24 mm achieved a total cost per hole some 50 per cent less than a comparable competitor drill., CoroDrill 862 was able to complete 650 holes, equating to 15.6 completed gear wheels before requiring replacement. This compared to the competitor product, which could only manage 417 holes (10.02 gear wheels).

Available in diameters of 1.85 to 2.95 mm (3 mm shank diameter across the range), CoroDrill 862 offers lengths of 8-12 x D. The drills are only for use with HydroGrip high precision chucks from Sandvik Coromant.