Dormer Pramet News

New generation of five-flute end mills

A new generation of solid carbide five-flute end mills, specifically for dynamic milling in general machining and die and mold applications, has been launched.

Our S7 assortment covers a wide range of operations in a variety of steels, cast irons and difficult-to-machine materials, including stainless steels and super-alloys.

These latest additions, S770HB, S771HB, S772HB and S773HB, offer increased feed rates up to 25 percent, compared with four-flute cutters. All feature a positive rake angle for smooth cutting action and to reduce the risk of work-hardening.

An AlCrN coating provides thermal stability, reduced friction, excellent wear resistance and prolonged durability, while a small corner radius and cutting-edge design gives a stable performance and prolonged tool life.

The S771HB and S773HB cutters are suitable for narrow pocketing, trochoidal slotting and profiling applications. These end mills include a chip divider to break swarf into manageable smaller pieces, helping to reduce spindle load and increase metal removal rates. This provides a 50 percent bigger width of cut compared to tools without a chip divider.

A neck recess helps avoid contact with the wall in shoulder operations, while through coolant improves welding resistance and enables a wide range of processes, especially for difficult-to-machine materials.

The S770HB and S772HB are more suitable for profiling, trochoidal slotting, and semi-finishing applications, offering maximum productivity due to optimal metal removal rate and reduced machining time.

Meanwhile, we have also added three multi-application high performance cutters within the S7 range for use on both CNC and conventional machine tools.

The new additions - S722HB, S765HB and S768 - support most common operations, such as slotting, plunging, contour milling, ramping and copy milling in various materials, including medium strength steels, stainless steels and super alloys.

​These four-flute cutters have a specific tooth design for improved chip evacuation. The AlCrN and Titanium Silicon Nitride (TiSiN) coatings support longer tool life, higher cutting speeds and increased heat resistance, making them ideal for dry machining.

Finally, a new solid carbide cutter for hardened steel above 49HRC has been added to our range. The S561 is specifically for high performance milling in a variety of applications, including die and mold machining.

This four-flute end mill features a specific tooth design for improved chip evacuation. A sharp cutter for hardened steel (52-70HRC), the S561 offers excellent surface finishing, while a gash land to improve strength and chipping resistance.

For more information regarding all the latest products, please contact your local Dormer Pramet sales office and follow all the social posts by searching for #RestartTheFuture.

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