Single Flute Extended Length Gundrill
In a field study on an aluminum cylinder head, the application of the extended drill was able to achieve a tool life of 2,000 parts per drill when machining holes of 8 mm diameter at 5,000 RPM in the cut and a feed rate of 1200mm/minute. Prior to the deep hole gundrill operation, there were two twist drill passes with the gundrill connecting the center portion of this feature in the head.