One-Hit Machining Takes Centre Stage

The focus is unambiguous: one-hit machining, and the operational and commercial benefits it delivers. For manufacturers wrestling with multiple setups, work-in-progress queues and the accuracy losses that come with re-fixturing, the pitch is a familiar but increasingly compelling one — complete the part in a single clamping.

Aimed at UK and Irish Manufacturers

That is a broad church — from subcontract precision shops through to larger OEM supply chain players — but the common denominator is pressure on cycle times, labour availability and margin.

A Heller HF 5500 FLEX horizontal simultaneous 5-axis mill-turn machine will be one of the main highlights at the event. As a horizontal simultaneous 5-axis mill-turn machine, it combines milling and turning operations in a single platform, exactly the kind of consolidation that one-hit machining strategies are built around.

Why It Matters

Events of this kind provide a platform for the process conversation that advanced machines enable. Bringing 11 advanced multi-tasking machine tools together under one roof gives attending engineers the opportunity to compare capabilities side by side — and to evaluate whether one-hit machining aligns with their current manufacturing processes. For component manufacturers considering capital investment against efficiency gains, this side-by-side comparison is where the real value lies.

The Heller HF 5500 FLEX, a late addition to Mills’ product line-up at the recent MACH 2026 Show in April, now takes centre stage at the company’s Innovation Day. It will be demonstrating its capabilities with a challenging machining task — the fast and precise processing of a complex aerospace blisk made from a heat-resistant super alloy.

“DN Solutions' acquisition of Heller in 2025 has significantly expanded the range of advanced machine tool technologies we (Mills CNC) can offer our customers.

“Heller machines, like the HF 5500 FLEX, are premium machine tools recognised globally for their outstanding performance and are a key technology for many aerospace, automotive and power generation OEMs, Tier One and specialist sub-contractors machining high-integrity components.

“At our Innovation Day event, customers will be able to see the Heller HF 5500 FLEX in action as it machines the aerospace blisk, and they will also have the chance to learn more about the machine and its strengths and capabilities through a series of live, in-person presentations delivered by Heller technical representatives.”

Tony Dale, Group CEO at Mills CNC

The machining demonstration and presentations will highlight how and why the HF 5500 FLEX has become a preferred one-hit machine tool choice for aerospace, power generation and automotive (heavy-duty) component manufacturing.


HF 5500 FLEX – a closer look

Equipped with the Siemens SINUMERIK ONE control and 24” multi-touch screen, the HF 5500 FLEX features a powerful HSK-T (mill-turn) spindle (45kW/12,000rpm/400N-m), up to 90m/min rapids on its linear axes, a 630mm x 630mm rotary, tilting table and a 50-tool position ATC.

The machine’s “FLEX” designation refers to the machine’s table loading configuration which, unlike some other Heller models, is built without an integrated pallet changer but, instead, features fast and flexible table loading access with direct workpiece set up and the ability to integrate the machine with a variety of external linear or rotary pallet systems.

The absence of an integrated pallet changer also means that the HF 5500 FLEX is a more compact machine with a smaller footprint.


Key attributes

The HF 5500 FLEX’s spindle is characterised by its narrow (lean) neck which, with its horizontal orientation, allows maximum spindle/tool projection and optimal reach inside complex-shaped workpieces.

Unlike vertical machining centres, the HF 5500 FLEX’s horizontal configuration and a 225-degree tilt on the machine’s table allows chips to fall naturally, and unencumbered, into a central conveyor to keep the workspace clear. Such ‘gravity-assisted’ chip removal ensures uninterrupted machining and higher productivity.

To manage heavy machining loads, the HF 5500 FLEX utilises a unique combination of a counter bearing and a YRT high-precision axial-radial roller bearing on the machine’s A- and B-axes ensuring greater process reliability and higher accuracies when machining higher loads.

Real time, multi-layered thermal compensation (i.e., active spindle thermal growth compensation), chilled spindles and drive and cabinet cooling keeps heat, and its effects, out of critical structural zones during heavy-cutting cycles and long machining runs — thereby improving part accuracies.

Furthermore, all linear axes use direct absolute linear encoders (measuring systems) rather than relying on motor encoders to maintain high precision, and ball screw thermal expansion issues are immediately detected and rectified in real time too.

“The Heller HF 5500 FLEX is a powerful, fast, precise and flexible mill-turn machine that delivers unrivalled simultaneous 5-axis machining performance and exceptional one-hit part processing.

“For highly-regulated industries and sectors that demand the machining of flawless, right-first-time and repeatable high-precision components, even when machining hard and difficult-to-machine materials, the Heller HF 5500 FLEX can be relied upon to deliver.

“The machine is one of eleven advanced machine tools being showcased at our Innovation Day technology event in October and, along with our latest SYNERGi automation systems, will demonstrate the way forward for component manufacturers looking to maintain, or acquire, a competitive edge.”

Tony Dale, Group CEO at Mills CNC