CMZ TL25 B CNC Lathe

A CNC lathe is a machine tool for turning workpieces – including metal – using computerised numerical control. CNC turning machines and automatic CNC lathes follow the same principle, differing primarily in productivity and throughput. These machines are capable of producing complex one-off parts as well as small- and large-scale series, with all movement procedures automatically executed and monitored by the integrated control system.

The predecessor of today's CNC lathe was the NC lathe, which relied on numerical control alone and did not support programme storage. CNC technology eliminated this limitation, enabling operators to retrieve programmes from memory, modify them, and save updates directly to the system – significantly streamlining the production workflow.

• Machine tools engineered for producing precision turned parts
• Computer-supported execution and monitoring of all machining processes
• Consistent production times that simplify planning and scheduling

All operating data is supplied to the machine in numerical form. The computer continuously compares this data against target values and applies corrections automatically via dedicated control devices. Before machining can begin, a CNC programme must be created – either directly on the turning machine or using an external computer, with the finished programme transferred via data storage or a network connection.

Programming follows procedures defined in the relevant DIN regulations. Central to every machining operation is the machine reference point, or machine zero point, from which all axis coordinates are calculated. A variety of tool holders allow the machine to perform different operations, including face cutting, longitudinal turning, and conical turning.

A MAZAK CNC lathe in operation illustrates how these capabilities come together in a modern production environment.

CNC lathe machines first emerged in Germany in the early 1980s, and advances in computer and mechanical engineering have transformed them considerably since then. Early models were later superseded by integrated lathe and milling centres, which combine multiple manufacturing processes for greater efficiency. The precision of CNC turning is particularly valuable when machining cylindrical components, where tight tolerances are essential.

Many CNC lathes can be paired with complementary machines to create highly versatile setups. A CNC turning/milling centre is a prime example, merging turning and milling in a single unit. When integrated into broader manufacturing environments – alongside industrial robots and automated transport systems – these machines form complete production lines capable of significantly boosting throughput. Control configurations vary widely depending on the application and manufacturer.

CNC lathes deliver outstanding results wherever high productivity and a clean working environment are essential. By automating the turning process, these machines consistently produce high volumes of parts to a uniform quality standard – while predictable cycle times make production planning straightforward. Their versatility extends to complex geometries and multi-machine operation, giving manufacturers genuine flexibility on the shop floor. A prime example is the production of clutch and drive pulleys, where both interior and exterior surfaces can be machined in a single clamping position.

The widespread availability of CNC lathes means there is a comprehensive range of machines on the market – yet a used CNC lathe is far from a low-value investment. Even first-generation models can command prices of up to ten thousand euros. CNC lathes are highly capable machines: their ability to automate the production of complex turned parts makes them an attractive prospect for manufacturers and enthusiasts alike. That said, they are among the most sophisticated and maintenance-intensive machines available, so purchasing second-hand requires solid background knowledge to assess suitability and get the equipment up and running. One practical advantage is that used CNC lathes are compatible with standard parts, keeping ongoing tooling costs manageable.

Once acquired, a CNC lathe can be fitted with tools and holders at very reasonable prices, and a wide range of peripheral equipment is available for turning machines. When evaluating a used model, a test run should form part of any thorough machine appraisal. Working with an experienced dealer is strongly recommended, as they can identify weak points during inspection. Turning a sample workpiece and measuring it with a digital calliper is a reliable way to detect wear in bearings and joints. The cooling and lubrication system should also be fully functional before purchase. A further benefit of the second-hand market is the well-established network of specialist companies offering maintenance and overhaul services for used CNC machines – making a full, cost-effective restoration entirely achievable.

The Case for Overhauling

Minor cosmetic issues – such as scratched housing panels or signs of condensation – are worth noting during negotiations but are rarely a reason to walk away. These components are straightforward to repair or replace and need not affect the machine's performance. A used CNC lathe can effectively expand an existing machinery fleet or broaden a department's production capabilities. A smaller used model is also well suited to training purposes, providing an excellent platform for learning CNC programming fundamentals, even where tight industrial tolerances are not required.

The second-hand CNC lathe market offers strong value across a wide range of makes, sizes, and specifications – whether you need a compact training machine or a full-capacity industrial turning centre.

The CNC turning machine market features a number of manufacturers with strong reputations for quality and precision. Leading names include TRAUB, MIYANO, INDEX, and VOEST-ALPINE, alongside MANURHIN and EMCO. Used CNC lathes from GILDEMEISTER are also widely regarded as excellent choices. German-engineered CNC lathes in particular are recognised for their exceptionally high standards of build quality and accuracy – a testament to the country's long manufacturing heritage.