Drill virtually eliminates delamination in CFRP composites

Not only does the special spur point geometry and new diamond coating virtually eliminate conventional composite drilling problems, such as delamination and splintering, it also offers up to three times greater tool life when tested against equivalent competitor products at identical speeds and feeds. CFRP, commonly combined with aluminium alloy or titanium, results in the generation of high cutting forces when drilling that can lead to delamination, splintering and fraying. The N30C wear resistant diamond coating is designed to reduce downtime by improving security and tool life in very abrasive materials such as CFRP. Its thin coating, in combination with micro-grain substrate, ensures easy cutting action for more accurate holes, with less friction through sharper cutting edges. Additionally, the unique low thrust geometry provided on CoroDrill Delta-C R854 reduces axial pressure, which in turn decreases deflection in thin-walled parts, helping to minimize common problems. In recent company tests, a 6.35 mm (1/4") CoroDrill Delta-C R854 was subjected to two CFRP drilling trials in comparison with a competitor's equivalent product claiming to be the current market leader. Both drills were put to work, first at 100 m/min speed and 0.05 mm/rev feed, and then at 200 m/min and 0.03 mm/rev. While the competitor's drill exhibited considerable problems with delamination and splintering, the holes produced by CoroDrill Delta-C R854 were virtually free of any such visible problems. CoroDrill Delta-C R854 comes in diameters ranging from 2.38 up to 20 mm, and in lengths up to 310 mm. It is also available in many different combinations, such as with or without chamfer for countersink operations