Drills

There are two stocked and standard product offerings where gundrills are delivered within 24 hours of the order. The SFGD Express program is for Single Flute Gundrills in diameters from 0.1250” - 0.7500” (3.175mm - 19.050mm) and lengths up to 48” (1219mm). The SCGD Express program is for Single Flute Solid Carbide Gundrills with standard ½” steel shanks in diameters from 0.0355”- 0.1969” (0.902mm - 5.000mm) in lengths from 4”- 12” (102mm - 305mm), depending on the tool diameter.  

PunchDrill features patent-pending geometry with an innovative chip breaker which produces short chips to control machining forces. The new drill also has newly developed surface treatments and a hard diamond-like coating specially designed for this application to provide reliable chip removal and increased process reliability. When high-speed PunchDrill is used at the recommended feed and speed, axial force is reduced by half.

A new type of flute design reliably evacuates chips, even with the tinniest drills. This capability ensures that hole depths up to 30 × Dc can be easily achieved with the DB133 Supreme micro drill with its 140° point angle. The DB131 Supreme micro pilot drill features a 150° point angle. Emulsion, oil or minimum quantity lubrication (MQL) can all be used as a coolant with these drills. The DB133 drills without internal coolant are available in a diameter range from 0.020-0.116 in. (0.5-2.95 mm).

The 180°-point angle makes the DC118 Supreme ideal for plunging into inclined or round surfaces because the drill is guided quickly on the margins and centered accurately. At the same time, burr formation remains extremely low. The protective corner chamfer on the cutting edges protects against rapid wear, which significantly increases tool life compared to drills without a protective chamfer. The excellent rigidity of the drill is a third feature which sets it apart from the competition.

The machining improvements are achieved by a special cutting drill contour with an added rear contour configuration that acts like a guide pad while the drill remains in the bushing, keeping the tool on location.  Once the drill is in the cut, these guide pads continue to force the tool to cut a straight path for the remainder of operation.

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.

The drills are coolant-through, straight flute (G-drills), with emulsion or oil and coolant pressure of 145-580 PSI (10-40 bar). They are offered in cylindrical shank configuration and have a 120° point angle with tolerance of m7. They are also offered in L/D ratio of 5 x Dc as standard, with options for shorter and longer drills to be ordered and specials through Walter’s signature Xpress quotation program.

ANCA has designed a special dental drill loading kit including tailored RoboMate pallets for FX machines using a Fanuc 200iD robot loader. The pallet top allows a reduction of the insertion depth of the shank with an 8mm pocket depth, so that drills with only 10mm of available shank length can be loaded. The robot grippers have also been modified for the reduced thickness of medical tools. The medical gripper can accommodate Ø2-10mm x 100mm with a maximum head diameter of 14mm.

In addition to the cooling and geometry, Walter's new WJ30RZ and WJ30RY grades also boost performance because their highly wear-resistant TiAlSiN-based layer applied using HIPIMS coating technology takes the form of a complete coating for 3 and 5xDc (WJ30RZ grade) and a point coating for 8×Dc (WJ30RY grade). The 8×Dc version also features a polished flute for deep drilling. The result is a very smooth surface which ensures optimum chip evacuation and minimizes built-up edges. The ability to recondition the drills boosts the cost effectiveness three times, paired with its long tool life, also further boosts cost-effectiveness.

The drill features a new grade, with an improved multi-layer physical vapor deposition (PVD) coating. The results are enhanced wear resistance, better tool life and an overall increase in productivity and thereby reduced cost-per-component.