Power-saving potential

This enables higher penetration rates especially in more difficult materials and by creating shorter, more compact chip forms, swarf can be more easily evacuated from the hole using lower pressure coolant.

Available through sole UK supplier Mollart Engineering, Lite-Cut gun drills are available in a single flute brazed tool, type 110 and solid carbide type 113. Type 110’s brazed solid carbide tip is available in diameters between 1.85mm and 51.2mm while Type 113 incorporates a kidney-shaped coolant channel with a diameter range of 1.5mm to 12mm.

Type 110 also incorporates brazed carbide bearing pads which, in conjunction with generated cutting forces, pressurises the pads against the wall of the drilled hole to support the cut and create a burnishing effect giving a high surface finish.

The drill head tube is brazed to a hardened and ground steel driver. Drill sizes between 1.85mm and 7.059mm have a single coolant feed hole while tool sizes 7.06mm to 51.2mm have twin coolant feed holes. Holes up to 40:1 depth to diameter ratio can be drilled in a single pass.

Meanwhile Type 113, with its kidney-shaped coolant feed channel, enables optimised flow into the cutting zone. The higher rigidity of the solid carbide tip of the tool and tube reduces any torsional generated vibration and flexing of the drill during the high-speed penetration of the material. Type 113 drills are available for holes up to 100:1 single pass, depth to diameter ratios.

Mollart www.mollart.co.uk