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Barrel-Shaped End Mill Halves Machine Time

Dormer Pramet’s S791 end mill offers more overlap, achieves a greater area of contact and requires fewer passes.

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Dormer Pramet barrel-shaped S791 end mill.

Photo Credit: Dormer Pramet

The Dormer Pramet barrel-shaped S791 end mill offers efficient five-axis machining for aerospace and die & mold applications.  

Providing high surface quality, and suitable for semi-finishing and finishing in steel, stainless steel, cast iron and super alloys, the company says the S791 cutter is the first design of its type within its range and includes a nose radius for fillet milling, plus a larger tangential form for curved and deep-w​​all surface machining.

Said to offer more overlap compared with conventional ball nose end mills, the barrel-shaped cutter achieves a greater area of contact with the workpiece, increasing tool life and lowering cycle time. It also requires fewer passes, reducing machine time by half. For example, Dormer Pramet says the barrel end mill required only 18 passes, compared to 36 with a ball nose version, when machining with the same parameters. 

An AlCrN coating provides thermal stability, reduced friction, wear resistance and prolonged durability, with several three or four-flutes options available.

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