Mapal replaceable drill head tooling

Unlike drill systems with replaceable blades, Mapal TTD drills deliver bore quality at least as good as that achieved with standard solid carbide drills. TTD drill heads feature MEGA-QUADRO four-chamfer geometry. In addition to the two normal guide chamfers on the blades, this uses two further guide chamfers to ensure maximum alignment accuracy, concentricity and positional accuracy in the bore, which allows roundness and diameter tolerances to be accurately met. The drills also feature internal channels that deliver coolant directly to the side face of the drill, thereby helping to maximise tool life. The key to the reliability and performance of Mapal TTD drills is the novel connection system between the replaceable carbide head and the holder. To guarantee the stability of the connected elements and to provide high torque transfer capabilities, this uses interlocking radial serrations with 12 or 18 teeth depending on the drill size. Replacing the head typically takes less than a minute and the asymmetrical form of the serrations ensures that the elements cannot be assembled incorrectly. The only tool required for this operation is an ordinary Allen key. The standard range of MAPAL TTD replaceable head drills cover diameters from 16 to 32 mm, and drilling depths of 3 x D, 5 x D and 8 x D. Three different types of head are available, optimised for machining steel and cast iron, stainless steel and non-ferrous materials. Special versions are available with PCD cutting edges to machine composite materials for the aerospace industry.