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TECH BRIEFS :: Standard lengths are 3× and 5× hole diameter, with a diameter range of 12 to 20.99 mm. :: The exchangeable-tip system ofers a secure, high precision interface between the drill body and tip for extra stability. but for the right area, it can provide an excellent solution. To be most efective, the exchangeable-tip drill should have a tolerance capability of IT9 to IT11 and an Ra better than 2.5 micron, depending on the application. Hole-depth capability needs to be 12 times the diameter, with semistandard options for shorter and intermediate lengths, further stability and depth options, and step and chamfer facilities. Tere needs to be a potential for relatively high penetration rates, the tool life of the tips needs to be long and consistent, and the tips need to be changed easily, quickly and in a foolproof way in the machine. N.J.) is a new-generation exchangeable-tip drill that provides improved machining economy to an important intermediate area of holemaking—the area usually determined by a specifc combination of hole diameter, depth and quality requirements. Te drill forms an integral part of the CoroDrill program and is positioned with the solid carbide CoroDrill 860 and indexable insert CoroDrill 880. Tis drill concept has been developed to provide the necessary range with a more advantageous combination of penetration rates, tool life, fnishing capability, reliability and tool handling. One of its advantages is the extent to which the tool can be tailored not only to suit, but also to optimize applications through diameter range and steps, length possibilities and shanks. Holes can be made more efciently and closer to the specifcations required, leaving holes better suited to subsequent operations. Te cutting edge geometry provides a safe cutting process with optimized chip control, high penetration rates and long, dependable tool life. Te drill is available in a diameter range of 12 to 20.99 mm (0.472" to 0.826") and lengths 3× and 5× hole diameter as standard. CONTRIBUTOR Jack Lynch is a senior product specialist at Sandvik Coromant. Improved Handling Te exchangeable-tip concept has been around for some years now, but potential weaknesses remain that are addressed in the development of new-generation drills. Tese concerns include strength and stability of interface, tool life, smooth cutting action, cutting data capability, degree of user friendliness, foolproof tip exchange, efciency of chip evacuation, fnishing consistency and machining reliability. Te CoroDrill 870, from Sandvik Coromant (Fair Lawn, Exchangeable Tip Drilling Webcast See a video providing more detail about the CoroDrill 870 with the online posting of this article. LINK :: short.productionmachining.com/improve For more information: Sandvik Coromant :: 201-794-5000 sandvik.coromant.com/us productionmachining.com :: 27