Dormer Shark Line takes a bite out of threading

January 15, 2015 10:21 am

 Designed to obtain superior performance, all Shark taps feature a coloured ring that signifies the specific material type it is suited to
Dormer Tools, a key member of the Sandvik group, has introduced a range of taps for material specific applications branded “Shark Line”.
Dormer’s expertise lies in the manufacture of superior quality round tools – primarily drills, taps and milling cutters – in solid carbide and high speed steel.
Designed to obtain superior performance, all Shark taps feature a coloured ring that signifies the specific material type it is suited to.
The programme encompasses spiral point taps for through-hole applications, spiral flute taps for threading blind holes and, in the case of white ring taps for cast iron, straight flute taps for both through or blind holes.
So, is there a need for material specific taps? Dormer’s Marketing Manager, Simon Winstanley, answers the question. He said, “Simply because of the multitude of forces exerted on the cutting edges, producing threads with taps is one of the most difficult machining processes a solid round tool can perform.”
He adds, “Working with a general cutting geometry in materials that have a low resilience will have the effect that the actual diameter of cut thread will be too large. In materials that have a high resilience the threads of the tap will become enclosed by the material with increased risk of breakage. Entering the workpiece material with rake and relief angles that are specifically suited for that range of materials is essential for producing the optimum thread.”

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