New Walter DB131 Supreme (top) and DB133 Supreme solid carbide micro drills.
Walter has expanded its solid carbide micro drill line with the addition of the DB131 Supreme micro pilot drill sizes.
Walter has also extended the DB133 Supreme micro drill offering to deep drills up to 30 x Dc. These new drills enable users to improve process reliability combined with minimal dimensional variations and extended tool life in steel, cast iron, nonferrous, super alloys, hard materials and other materials (ISO P, K, N, S, H and O). Stainless steel (ISO M) is added to the list with internal coolant capability.
The incorporation of Walter grades WJ30EL and WJ30ER enhance wear resistance. In addition, the degree of cutting-edge preparation improves surface finish.
Chip evacuation is accomplished with a new type of flute design, ensuring that hole depths up to 30 × Dc can be 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 new DB133 drills without internal coolant are available in a diameter range from 0.020-0.116 in. (0.5-2.95 mm). The diameter range for the micro drills with internal coolant is 0.028-0.116 in. (0.7-2.95 mm). Length to diameter ratios (L/D) of 5, 8, 12, 16, 20, 25 and 30 × Dc are standard for micro drills with internal coolant and 5 and 8 × Dc without internal coolant. This new drill design is effective for applications in the medical, watchmaking, general mechanical engineering, mould and die making, energy and automotive industries.