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T2139 Ball Nose Finish Milling Arbor
$50.00
T2139 Ball Nose Finish Milling Arbor—forged from 42CrMo alloy steel with triple processing, reaching HRC 48-52 hardness for superior torsion resistance and deformation prevention. The precision head slot fits R3-R16 semi-circular ball nose inserts, ensuring radial runout as low as 0.005mm and seamless curved surface milling without tool marks. High-strength screw locking prevents insert loosening, compatible with all common CNC spindles. It is an essential tool for mold and automotive component curved surface finishing!
Precision curved surface milling, perfect shaping! This T2139 ball nose finish milling arbor is specially designed for CNC machining centers, milling machines, and other numerical control equipment. As a core tool accessory for high-precision spherical contour milling of mold cavities, curved parts, and automotive components, it is compatible with semi-circular ball nose inserts. With its high-rigidity structure and precision manufacturing, it enables efficient finishing of complex curved surfaces, radii, and circular contours, significantly improving workpiece surface finish and machining accuracy. It is an essential milling tool for mold factories and precision machinery plants.
The arbor body is forged from premium 42CrMo alloy steel via one-piece forging, undergoing triple processing: high-temperature quenching, low-temperature tempering, and cryogenic treatment. Boasting a hardness rating of HRC 48-52, it delivers exceptional torsional strength and impact toughness. Even under high-speed cutting and heavy feed conditions, the arbor resists deformation and vibration, ensuring stable transmission of cutting forces and maintaining precise cutting performance of the insert. Its service life is 3-5 times longer than ordinary carbon steel arbors. The surface features dual treatment: nickel plating for rust resistance + mirror polishing, which resists erosion from cutting fluids and oil stains, prevents rust and jamming, and reduces cutting resistance for smoother milling.
Core structural designs address key curved surface machining pain points:
- Precision slot and positioning hole: The head slot is precisely matched to the mounting reference of semi-circular ball nose inserts. Combined with high-precision positioning holes, the insert achieves a radial runout (TIR) as low as 0.005mm after installation, ensuring spherical contour accuracy and eliminating visible tool marks and dimensional deviations on curved surfaces.
- High-strength locking structure: The insert is secured with an internal hexagon screw, providing uniform and powerful clamping force. Even during high-speed machining (up to 12,000 RPM), the insert remains firmly in place without loosening or falling off, ensuring machining safety and stability.
- Compatible with full range of ball nose inserts: Works with semi-circular ball nose inserts from R3 to R16, covering machining needs from small radii to large curved surfaces. No need to replace the arbor when switching inserts of different diameters, reducing tool procurement costs.
User-friendly details meet diverse machining needs:
- Standardized shank design: Available in straight shank or Morse taper shank, strictly compliant with CNC spindle interface standards. It is compatible with most CNC machining centers and milling machines on the market, enabling quick installation and removal without additional adapters.
- Dynamic balance optimization: The arbor is professionally calibrated for dynamic balance, minimizing centrifugal force during high-speed rotation, reducing spindle vibration, further improving workpiece surface finish, and eliminating the need for subsequent polishing.
- Clear specification marking: The arbor surface is engraved with specifications such as compatible insert radius and shank diameter, allowing for quick identification during tool changes. Paired with a classified storage case, it enhances workshop management efficiency and significantly reduces tool change time.
Widely applicable in professional scenarios: Whether it’s high-precision mold cavity milling, complex part radius machining in precision machinery factories, or circular contour finishing in automotive component plants, this T2139 ball nose finish milling arbor delivers reliable performance. With core advantages of high rigidity, ultra-precision, and strong compatibility, it becomes a trusted partner for CNC curved surface finishing, ensuring accurate and efficient machining operations and helping enterprises consistently produce high-quality products!
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