Friday, June 12, 2009

Dormer Offers Replaceable-Head Drilling Solution

Dormer Tools has added a replaceable-head drilling solution to its programme of solid-carbide tooling. Offering high productivity across a range of materials, the range - branded Hydra - represents a cost-effective alternative to solid-carbide drills. Two head types are available.

The Hydra-M (R960) has been developed to give optimum performance in stainless steel and cast iron, but is also recommended for drilling operations in titanium and nickel. The Hydra-P (R950), meanwhile, is suitable for machining carbon and alloy steels. All drilling heads are manufactured from micrograin carbide and feature a titanium aluminum nitride-based coating for high toughness and oxidation stability, enabling high speeds and feeds while resisting built-up edge.

The self-centring 140-degree four-facet split point means that required thrust forces are low, while the need for pre-drilling is eliminated entirely. Heads are held in place by two screws; ground serrations on the back of the drill head and body tip interlock perfectly, maximising tool rigidity and ensuring even torque transmission for accuracy and precise tolerances, according to the company. Andrew Reynolds, drilling product manager, said: 'One major benefit of the Hydra range is that the heads can be quickly and easily changed without removing the body from the spindle, thus reducing machine downtime.' Available for drilling depths of 3 x diameter (H853), 5 x diameter (H855) and 8 x diameter (H858), drill bodies are made from hardened steel with high-gloss nickel plating for increased resistance to wear and corrosion.

One body can accommodate multiple head sizes with no compromise on structural integrity. The slow spiral offers optimised flute volume, while internal coolant channels ensure smooth chip evacuation. Both Hydra-M and Hydra-P are available in a comprehensive size range (12mm to 30.5mm or 15/32in to 1.3/16in).

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