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.
Star SU, part of the Star Cutter family of companies, announces its single flute extended length gundrills, which are custom-built drills per application that can be produced in lengths up to 24.0″ [610mm) and effective tool lengths up to 100 x D. These drills are designed to machine straight deep holes and hold excellent finishes in virtually any material.
In real-world applications, these gundrills have numerous benefits including:
- Higher chip load capability, helping reduce cycle time
- Reduced drift, which allows excellent TIR results from start to exit
- Increased resistance to wind-up forces, helping reduce premature tool wear
- Increased distances for unsupported lengths over traditional gun drills
- Ability to recoat tool after regrinding if manufactured without a steel driver
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.
