The SE54HPC, SE255HPC, and SE256HPC carbide drills can reduce machining costs in a range of cast irons by offering machine speeds 30 to 40 percent higher. The drills run at 525 surface feet per minute in ductile irons and 700 SFM in gray cast iron. The key to the performance is the high positive rake angle that reduces cutting forces and a sculptured edge drill geometry that increases centering at the top of the hole, which improves overall hole quality. The drills feature an advanced PVD coating with a high hot hardness, shielding the cutting edge from the heat generated at high speeds. All three new drills borrow features from previous designs such as HP point geometry that provides 20 percent lower thrust than conventional drills. But enhancements include a 135° point with a 45° corner chamfer that reduces tool pressure upon hole exit and prevents breakout in gray cast iron. Their new double-margin design provides four-margin contact over the hole cross-section, raising margin contact from 25 to 46 percent. This improves drill stability in applications with irregular exits, angled entrances, inclusions, and interrupted cuts such as cross-holes. The drills are offered in a new grade, KC7315 that features a multi-layer advanced physical vapor deposition coating with high hot hardness and surface smoothness, enabling higher speeds in cast iron machining. The new grade also features a 9.5 percent cobalt submicron substrate. The drills are available in metric sizes from 0.1563 in. to 0.75 in. diameter in lengths of three times the hole diameter, in diameters from 0.1563 in. to 1.010 in. in lengths of five times the hole diameter, and in diameters from 0.1563 in. to 0.7580 in. in lengths of seven times the hole diameter. The drills should be reconditioned by the company reconditioning service to guarantee optimum repeat performance. The service offers like-new quality, five to seven calendar day turnaround on coated standard Kennametal, and competitive solid carbide drills, and the Blue Box, a secure, delivery-paid container.

Kennametal
www.kennametal.com