Flute and Thread Grinding

When grinding rotating workpieces such as drills, end mills, and micro rotary tools, high form accuracy, sharp cutting edges, and reproducible surfaces are essential. At the same time, small tool diameters, high cutting speeds, and unstable cross-sections place high demands on the grinding tool.

CBN and diamond grinding wheels with matched polyimide and hybrid bonds enable process-stable machining with defined clearance behavior. The combination of thermal stability, controlled porosity, and matched grain retention ensures low grinding forces, stable edge quality, and reproducible tool life – even in series and high-volume processes in the tooling industry.

Product program

• Product types: cylindrical, profile, and flute grinding wheels for machining drills, end mills, and micro rotary tools
• Abrasive: diamond (carbide, cermet) · CBN (HSS, PM steels, high-alloy tool steels)
• Bonds: phenolic bond (PF), polyimide bond (PI / HT-PI), hybrid bond (HB)
• Grit sizes: D46 – D151, B46 – B151
• Dimensions: Ø 75 – 400 mm, profile and flute geometries customer-specific, multi-wheel packages for complete machining in a single setup
• Design: matched to common tool grinding machines (e.g. ANCA, Walter, Rollomatic, Schneeberger)

Process and benefits

• Longer dressing intervals – stable profile geometry and higher net runtime per shift
• Consistent flute and surface quality – reproducible cutting-edge quality over the entire tool life
• Reduced thermal load – lower risk of grinding burn and dimensional deviation at high feed rates

Application example

Hybrid bond | diamond D76 – flute grinding of solid-carbide end mills (Ø 8 mm, 4 flutes) in series production.

Up to 25 % more tools per dressing cycle. Constant flute width (±0.01 mm), reduced grinding forces, stable surface quality (Ra 0.4–0.6 µm) over the entire tool life.