HZA Pro live centres with cylindrical shank are precision components designed for counter-clamping and axial support of workpieces on turning machines, grinding machines and workholding systems used in industrial machining. They are suitable for applications with lathe chucks, collet chucks, tool take-ups, tool magazines and turrets, where the workpiece or tooling system must be kept stable during rotation. The cylindrical shank allows mounting in dedicated seats, specific holders and machine systems where a Morse taper is not used and a direct, precise and repeatable cylindrical coupling is required.

The HZA Pro series is an all-round live centre with hardened and ground body, developed to provide high rigidity, long service life and precision in turning and grinding operations. Body hardening increases resistance to wear and deformation, while grinding improves the quality of the fit with the mounting seat and contributes to the stability of the entire machine-fixture-workpiece system. The 60° tip angle is suitable for most centring and support applications on cylindrical parts, shafts, pins, bushes, turned components and precision mechanical workpieces.

One of the most important technical features of the HZA Pro live centre is the proven three-bearing system, designed to withstand high axial and radial loads during rotation. This allows the live centre to operate under demanding working conditions while maintaining stability, smooth running and centring accuracy. Lifetime lubrication reduces the need for maintenance and supports continuous operation, reliability and long service life, especially in production departments with repetitive cycles or intensive use.

Concentricity is a key parameter for this product category. The HZA Pro series offers a maximum concentricity deviation of 0.005 mm, which is particularly important in machining operations requiring dimensional accuracy, repeatability and geometric control of the workpiece. A live centre with high concentricity helps reduce vibration, runout errors, ovality, form defects and instability during turning or grinding. This improves surface finish, preserves machining accuracy and reduces the risk of production rejects.

The use of a live centre with cylindrical shank is especially useful when the workpiece must be supported reliably without compromising alignment with the machine axis. In turning, the live centre helps stabilise long, slender or deflection-sensitive parts, while in grinding it supports smooth and controlled rotation during finishing operations. In applications involving turrets, tool magazines or tool take-ups, it can be used as a support and counter-clamping element in specific machine or tooling configurations.

This category is suitable for machining free-cutting steels, alloy steels, hardened steels within the limits of the application, light alloys, non-ferrous materials and industrial components used in automotive, aerospace, precision engineering, machine building and turned-part production. For technicians, maintenance operators and workshop specialists, the correct choice of the live centre must take into account the cylindrical shank diameter, machine seat compatibility, expected load, rotational speed, material being machined and required precision level.

Tadaah offers HZA Pro live centres with cylindrical shank as a technical solution for professionals requiring precision, reliability and durability in turning and grinding operations. The combination of hardened and ground body, 60° tip angle, three-bearing system, lifetime lubrication and concentricity deviation up to 0.005 mm makes this series suitable for production departments, industrial maintenance, machine-tool builders and workshops requiring stable, precise and professional support for rotating workpieces.

Usage

For optimal performance, the live centre is mounted in the tailstock quill of the lathe or grinding machine. If the model includes a clamping surface, it can be additionally secured with a fastening mechanism for greater stability. The workpiece is then positioned between the chuck and the live centre, with the 60° tip fitting into a previously machined conical seat, ensuring stable support.

Once positioned, the machine quill is advanced to apply the correct pressure on the workpiece, ensuring a secure hold without excessive force that could cause deformation. Unlike fixed centres, the rotating version features internal bearings that allow it to spin along with the workpiece, reducing friction and wear. This feature is crucial for high-speed operations, such as precision turning and grinding.

During machining, the live centre helps maintain concentricity and reduce vibrations, improving the quality of the surface finish. At the end of the process, the pressure is released, and the workpiece is removed. The quality of the machining is then checked, and if necessary, maintenance is carried out. Thanks to its permanent lubrication and robust hardened and ground structure, the Röhm HZA PRO live centre requires minimal maintenance while ensuring long-lasting precision and reliability.