Three-flute roughing spiral end mill VHM from the SF51 series 

Index: SF51.08.032.080.08XR

Industrial spiral end mill made from solid carbide (VHM) from the SF51  series with a negative design (chip removal downwards). Designed for efficient rough machining, cutting, and reaming on CNC machining centres and gantry milling machines. The left-hand helical groove (negative) presses the material down onto the working table, eliminating the risk of tearing on the upper edge of the workpiece. Three spiral blades with a profiled chip breaker reduce cutting resistance, decrease spindle load, and effectively dampen vibrations during intensive cutting. The ground shank in class H6 accuracy protects the drive system and ensures high process stability.

Key technical parameters and properties:

• Three-flute roughing design Z3 (negative): Dedicated roughing profile with chip removal downwards presses the workpiece down onto the table and ensures a perfectly finished, clean upper edge.
• Premium class solid carbide (VHM): Rigid monolithic design minimizes tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Breaks the machined material into smaller fragments, reducing cutting resistance and stabilizing the operation.
• Optimised shank roughness: The surface of the shank is characterised by low roughness (Ra ≤ 0.3 µm), preventing slipping in the holder and protecting the spindle cone from wear.
• Dynamic balancing class G2.5: Static-dynamic balancing in accordance with ISO/EN standards (class G2.5) eliminates vibrations at maximum rotational speeds.
• Advanced protective coating NaDia (series .XR): Black PVD coating with extreme hardness of 3650 HV and very low friction coefficient (0.01–0.05) applied at low temperatures. Drastically increases the blade's wear resistance, prevents material sticking, and significantly extends the tool's lifespan during machining of wood, laminates, plywood, plastics, and aluminium.