Reasons to choose precision turning of components based on technical drawings

Precision turning of components based on technical drawings is built on a clear principle: it is not the design that should adapt to the component, but the component that is designed and manufactured according to its application.

This approach ensures full alignment between function, geometry, and material, leaving no room for approximation. Its advantages are especially evident in advanced industrial applications. In high-precision sectors, standard components often lead to design compromises, with suboptimal tolerances and performance that falls short of specific application requirements

In custom turning based on technical drawings instead, every detail is defined from the early design stage: from dimensional tolerances and surface finishes to the selection of the most suitable material. The result is a component fully compliant with technical specifications, seamlessly integrated into the system and contributing directly to its performance.

Advantages of precision turning of components based on technical drawings

Precision turning of components based on technical drawings relies on tightly controlled processes and advanced technologies, ensuring high-quality standards even in mass production. Repeatability of components is a critical factor, particularly in sectors where every part must meet stringent requirements and maintain consistent performance over time.

This level of reliability also translates into greater production stability. Unlike standard components, which may vary between batches or suppliers, custom production ensures continuity and traceability key elements in complex industrial environments.

Another key aspect is its economic impact. Despite common perceptions, custom components do not necessarily lead to higher costs over time. Optimizing geometries and tolerances reduces waste, streamline assembly operations, and minimize maintenance requirements – ultimately improving overall production efficiency.

A trusted partner in precision turning of components

Sarbo specializes in automatic precision turning of components for contract manufacturing clients. Each project is carefully evaluated to ensure technical feasibility and identify the most efficient production methods.

In-depth knowledge of machining processes and materials allows Sarbo to work closely with its clients through a collaborative approach. Continuous technical consultation between all parties becomes an integral part of the process, translating design requirements into concrete, reliable, and industrially sustainable solutions.

When needed, Sarbo identifies opportunities for improvement. During the analysis phase, potential optimizations related to geometries, tolerances, or material selection are carefully assessed. In these cases, Sarbo works alongside its clients as a trusted partner, proposing design improvements that reduce production costs while maintaining or even enhancing component performance.

Sarbo operates with a comprehensive range of state-of-the-art machines for precision mechanical turning, capable of handling even the most complex requirements with optimized lead times. Its production processes are certified to ISO 9001 standards.

Explore materials for precision turning of components.

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Choosing the Right Material for Precision Turned Parts

Material selection affects more than just the performance of the finished component. It also impacts process stability, tool life, and the surface finish that can be achieved. Choosing the right material for each application is a critical part of precision metal machining, requiring a thorough understanding of alloy properties and machining behavior. Different materials behave differently during machining. Free-machining steels, stainless steels, alloy steels, bronze, brass alloys, and aluminum each require specific machining parameters and strategies to achieve consistent results.

Raw material quality is just as important. Using certified, high-quality bar stock helps maintain process consistency, reduce defects, and hold tight tolerances throughout high-volume production.

From Engineering Drawings to Production Planning

Modern precision metal machining involves much more than producing parts from a technical drawing. Every stage of the manufacturing process is carefully engineered to optimize materials, machining strategies, and production methods, ensuring that every component meets customer’s specifications.

Before production begins, engineering drawings are thoroughly reviewed. Critical dimensions, tolerances, surface finish requirements, concentricity, threads, and other geometric features are analyzed to determine the most efficient machining process. This production planning phase makes it possible to select the right CNC equipment, tooling, and any custom fixturing required while optimizing the machining sequence for maximum efficiency. The objective is not only to produce parts that meet specifications, but also to establish a stable, efficient manufacturing process that minimizes scrap and delivers consistent quality. In high-volume production, this upfront engineering work plays a critical role in improving efficiency, maintaining repeatability, and controlling production costs.

Secondary Operations Complete the Component

Production requirements vary depending on component complexity, production volumes, and tolerance requirements. For this reason, a precision metal machining shop typically relies on different types of equipment, each suited to specific manufacturing needs. CNC lathes offer high flexibility for producing complex components and maintaining tight tolerances even on intricate designs. Multi-spindle machines are the preferred solution for high-volume production where cycle times need to be minimized. For small-diameter parts with high length-to-diameter ratios, sliding headstock (Swiss-type) lathes are commonly used. Multi-tasking turning centers allow operations such as milling, drilling, and threading to be performed in a single setup, reducing handling time and improving dimensional accuracy.

Technologies Used in Precision Metal Machining

Turning is often only one step in the manufacturing process. Many components require additional operations to improve mechanical properties or meet specific application requirements. Heat treatments and surface treatments, cleaning and degreasing, grinding, and lapping can increase hardness, improve wear and corrosion resistance, or achieve very tight surface finish requirements.

The ability of a precision metal machining shop to coordinate these secondary processes helps reduce lead times, simplify production management, and ensure consistent quality throughout the entire manufacturing cycle.

Quality Control in Precision Metal Machining

The quality of precision turned parts does not depend solely on machine accuracy. It is continuous process control that ensures dimensional consistency throughout production.

A precision metal machining shop performs regular in-process checks, monitoring tool wear, cutting parameter stability, and conformance of critical dimensions.

At the end of the production cycle, each batch undergoes dimensional inspection according to defined quality procedures. High-precision measuring instruments are used to verify geometric tolerances, diameters, lengths, concentricity, and surface finish requirements, ensuring full compliance with engineering drawings.

This approach reduces scrap, improves process reliability, and ensures production continuity for scheduled manufacturing runs.

Sarbo: Precision Metal Machining for High-Accuracy Applications

For over fifty years, Sarbo has operated as a precision metal machining company, producing precision turned components for customers in the automotive, hydraulic, pneumatic, electromechanical, and industrial sectors.

The company supports customers from the earliest stages of production planning, reviewing engineering drawings, identifying the most efficient manufacturing process, and proposing potential improvements to enhance productivity and quality. It machines brass alloys, free-machining and stainless steels, alloy steels, aluminum alloys, and bronze.

With a continuously updated machine park, strong technical know how, and an ISO 9001-certified quality system, Sarbo is a reliable partner for customers seeking precision metal machining with consistent accuracy, process stability, and production continuity—even for complex and high-demand projects.

Learn More About Our Precision Machining Operations

FAQs on Precision Metal Machining

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What is a contract machine turning company?

A contract machine turning company is a specialized manufacturer that produces custom turned components for other businesses based on customer supplied technical drawings. Instead of developing and selling its own products, a contract turning company machines metal parts according to the client’s specifications, managing the entire production process, from raw bar stock selection to the finished component. Once production is complete, the parts are delivered to the customer that commissioned them.

In a contract turning arrangement, production is entrusted to a specialized manufacturer with dedicated equipment, in depth knowledge of machining different materials, and established quality assurance procedures. This model can efficiently support a broad range of requirements, from complex low volume projects to large scale production runs that demand precision and consistency.

What are the benefits of outsourcing turning operations?

Choosing a contract turning service gives companies greater cost predictability. Because each component is manufactured under pricing terms established in advance, businesses can accurately determine the unit cost of each part and plan production with greater confidence. This is particularly valuable in industries where controlling the cost of individual components has a direct impact on competitiveness and overall product profitability.

Outsourcing also gives companies access to the expertise and technical know how of experienced manufacturing partners. A specialized turning company understands the characteristics of different materials, the tolerances required for each application, and the machining behavior of various alloys. Its established quality control systems help minimize scrap, ensure consistency, and maintain repeatable production standards. The result is greater manufacturing flexibility, more reliable lead times, and the ability to focus internal resources and investments on core business activities.

Main advantages of contract turning

The key benefits that are leading a growing number of companies to choose contract turning services include:

• Reduced capital investment: no need to purchase or maintain lathes or machining centers.
• Variable and scalable costs: pricing is based on actual production volumes, allowing for better budget control.
• Specialized expertise: access to technical know how and experienced operators without the need for in house training.
• Consistent quality: dimensional inspection systems and certified processes (such as ISO 9001:2015) that ensure compliance and repeatability.
• Production flexibility: the ability to handle both small batches and large production runs, adapting to changes in demand.
• Wide range of materials: machining capabilities covering stainless steels, free cutting steels, brass, aluminum, and bronze, depending on the application.

How to choose a contract turning partner for automotive components

The automotive industry sets especially high standards for quality, traceability, and component reliability. As a result, choosing a contract turning partner shouldn’t come down to price alone. The first thing to look at is the supplier’s quality management system: in the automotive sector, the key international standard is IATF 16949, which builds on ISO 9001 and is specifically designed for high volume production environments. A machine shop that already works to ISO 9001:2015 standards is typically starting from a solid foundation in that direction.

Beyond certified quality systems, it’s important to evaluate production capacity, whether the equipment in place can handle the required volumes, and how advanced the inspection and measurement capabilities are. On time delivery performance, available value added services (such as cleaning, surface finishing, and packaging), and the ability to support integrated logistics are all factors that help define a reliable manufacturing partner.

What technologies do leading contract turning companies use?

Leading contract turning companies have long moved beyond standalone manual machines and now rely on high productivity automated turning systems. Multi spindle lathes make it possible to machine several parts at once, significantly reducing cycle times in high volume production. At the same time, CNC multi spindle machines combine speed with flexibility, making them well suited for complex part geometries.

For components that require very high precision, CNC turning centers and twin spindle CNC lathes allow multiple machining operations to be completed in a single setup, improving both accuracy and efficiency. These technologies are supported by advanced finishing and inspection processes such as grinding, lapping, ultrasonic cleaning, and precision measurement systems that ensure every batch meets specifications. In the end, it’s the combination of automation, quality control, and skilled operators that distinguishes a truly advanced contract turning operation.

Partnering with a leading contract turning specialist

With more than 50 years of experience in high precision automatic turning and ISO 9001:2015 certification, Sarbo is a trusted partner for companies looking for precision turned metal components from bar stock. Product quality has always been the company’s core strength and is ensured through standardized operating procedures supported by modern, high precision measuring equipment. Sarbo offers a complete range of contract turning capabilities, from CNC multi spindle lathes and advanced turning centers to twin spindle machines. The company has recently expanded its production equipment with the addition of the Multisprint 36 multi spindle lathe: a state of the art machine designed to increase productivity while maintaining the high levels of precision required for complex components.

Sarbo complements its machining capabilities with a full range of value added services, including heat treatment, surface finishing, cleaning and degreasing, quality inspection, and logistics solutions that help simplify procurement and production planning.

Contact our team to learn more about our contract turning solutions.

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The Evolution of Multi-Spindle Turning

Modern machines used in multi-spindle turning have moved beyond the traditional concept of high-volume production, evolving into highly sophisticated systems capable of performing simultaneous multi-axis machining operations. 

This evolution makes it possible to perform multiple operations within a single production cycle, tasks that once required several machining stages and different machines. Axial and cross drilling, tapping and threading, milling, grooving, and broaching can all be integrated into the same process, dramatically reducing downtime and minimizing the risk of errors.

The fundamental principle of a multi-spindle lathe is the simultaneous machining of multiple workpieces across several spindles, each operating at a different stage of the production cycle. While one part is undergoing rough machining, another is already being finished, a third is undergoing axial drilling, and a fourth is being prepared for unloading. This parallel machining approach, often referred to as an overlapping production cycle, significantly reduces machining time. As a result, multi-spindle turning offers exceptional efficiency, enabling high-volume production without compromising precision.

Multi-Axis Integration: A Tangible Competitive Advantage

Multi-spindle lathe with multi-axis capabilities makes it possible to consolidate multiple operations into a single production cycle, eliminating the need for additional machining processes. This results in a significant reduction in operating costs and greater process repeatability, an essential advantage for manufacturers handling large production runs. At the same time, the ability to manage complex geometries expands the range of possible applications, enabling manufacturers to respond more flexibly to evolving market demands. Technical components requiring intricate machining operations can be produced through multi-spindle turning with precision and consistency, while maintaining tight tolerances and high quality standards. This allows companies to meet increasingly complex market requirements with greater flexibility, without sacrificing efficiency.

Sarbo: Where Technology and Vision Drive Production

Sarbo is a multi-spindle turning company specialized in the production of custom precision-turned metal components, capable of working with a wide range of materials. Alongside its consolidated experience with mechanical multi-spindle lathes, the company has invested in next-generation CNC multi-spindle lathes equipped with robotic arms. This solution enables full programmability of all machining parameters. Spindle rotation speed, feed rates, depth of cut, tool paths, and axis synchronization are all defined digitally and can be recalled instantly when switching production batches.

The transition from one component to another on CNC machines is significantly more flexible and faster than on purely mechanical setups. Machine setup, while still involving both software programming and the physical installation and adjustment of tools, helps optimize changeover times and enables the management of more complex and varied production mixes. In some cases, these adjustments can be completed within the same day.

By contrast, on mechanical multi-spindle machines, the same operations require more complex interventions and considerably longer setup times.

The robotic arm integrated into multi-spindle turning systems adds another level of automation by handling the loading and unloading of components, reducing the need for manual intervention in material handling. This enables extended unattended production cycles, greater operational continuity, and reduced non-productive time.

Learn more about materials used in multi-spindle turning.

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Challenges in hard metal and special alloy turning

Turning hard metals and special alloys, such as nickel-based superalloys, titanium or hardened steels, requires a specific approach based on advanced technologies, specialized expertise and strict control of every phase of the process. These materials are characterized by high hardness, intrinsic brittleness and low thermal conductivity.

During machining, heat tends to concentrate in the cutting zone, placing the tool under significant stress and increasing the risk of premature wear, cutting edge microfractures and loss of surface quality. In addition, the high cutting forces generated can cause vibrations, process instability and difficulties in maintaining tight tolerances, especially when high-precision surface finishes are required during hard metal turning.

Process control and management of cutting variables

One of the key elements in hard metal and special alloy turning is the use of diamond and CBN superabrasive tools.

Polycrystalline diamond is particularly suitable for machining abrasive materials and non-ferrous alloys because it ensures significantly longer tool life and enables extremely high-quality surface finishes. CBN, on the other hand, is the ideal choice for turning hardened steels and high-hardness ferrous materials thanks to its resistance to high temperatures and its ability to maintain cutting-edge stability even under extreme cutting conditions.
Alongside tool selection, the cutting parameters optimization plays a fundamental role. Cutting speed, feed rates and depth of cut cannot be set using standard values but must be defined according to the material, the workpiece geometry and the machining conditions.

Another key factor in hard metal and special alloy turning is machine and setup stability. Machining high-strength materials requires machine tools equipped with high-precision spindles and high structural rigidity in order to minimize unwanted vibrations and deflections. A carefully designed setup allows consistent process quality and enables machined surfaces to reach high standards of precision and repeatability.

Sarbo’s approach to hard metal and special alloy turning

Sarbo is able to successfully handle hard metal and special alloy turning, providing customers with a tailor-made technical solution. The goal is to guarantee performance, reliability and consistent quality even in the most critical applications.

The use of diamond and CBN superabrasive tools, selected according to the material to be machined and the technical specifications of the component, ensures high wear resistance, cutting edge stability and high-level surface finishes.

The effectiveness of superabrasive tools is further enhanced through careful optimization of cutting parameters. At Sarbo, spindle speed, feed rates and depth of cut are never defined using standardized values, but are determined through technical analyses that consider the material microstructure, the workpiece geometry, system rigidity and production objectives.

The attention to setup and machine tool stability ensures precision and quality. Every phase, from workpiece clamping to tooling selection, is designed to minimize eccentricity, deflection and micro-vibrations that could compromise the final quality.

Contact us for more information about hard metal and special alloy turning.

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What is a multi-spindle lathe and how does it work

Unlike traditional lathes, where each piece is machined in sequence, the CNC multi-spindle lathe is designed to machine multiple parts simultaneously and perform different machining phases in parallel. The principle is simple yet effective: multiple spindles operate simultaneously, each on a specific phase of the production cycle. This eliminates downtime, drastically reduces machining times, and enables continuous, stable, and highly repeatable production.

Specifically, the multi-spindle lathe allows to:

• avoid frequent machine changes and repositioning, due to the ability to perform multiple operations simultaneously,
• improve the efficiency of the production cycle by keeping tools constantly in operation,
• integrate different processes (such as turning, drilling, milling) within the same machine cycle, due to advanced CNC programming.

This combination of technologies makes multi-spindle lathes ideal for series production of complex small parts, where fast delivery and consistent quality are critical requirements.

The advantages of the CNC multi-spindle lathe

The strength of multi-spindle lathes lies in their ability to work on several parts simultaneously or to carry out different operations on the same parts without interruption. In practice, while one spindle performs a primary operation, another can complete a secondary one, maintaining continuous and high-output production.

In precision turning processes, each repetition adheres to very tight dimensional tolerances. By eliminating the need to reposition parts between operations, multi-spindle lathes reduce geometrical and positional errors. Precision is not left to chance it’s built into the production method.
These machines also support advanced numerical control systems, which further enhance repeatability.

The multi-spindle lathes in use at Sarbo

For a company specialized in precision automatic turning, the CNC multi-spindle lathe is a strategic choice. Beyond machining speed, this equipment ensures accurate process control, stable cycle times, and greater repeatability even for parts with narrow tolerances.

Thanks to real-time monitoring systems and OEE (Overall Equipment Effectiveness) analysis, Sarbo constantly optimizes its production performance, reducing inefficiencies and ensuring reliable, high-quality output.

Discover our multi-spindle lathes.

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Technical consultancy and turning services

An efficient turning service starts from a technical and consultative approach. A specialized turning company does not simply execute the received technical drawing: it analyzes and optimizes it, suggesting changes that can simplify the process and reduce costs without compromising quality or functionality. Often, small modifications allow for shorter machining times or the use of more cost-effective materials while maintaining the same mechanical performance.

Consultancy also includes selecting the most suitable material based on machinability, resistance, and cost, with an approach oriented towards efficient and sustainable production.
The turning service is complemented by additional processes, such as high-level cleaning and degreasing of parts, heat or surface treatments, grinding, lapping, and certified dimensional checks.

Turning and just-in-time delivery

A turning company is not limited to producing metal small parts. It acts as a technical and production partner, supporting the client at every stage, from design to delivery. The Just in Time model allows for planning each job based on actual demand, optimizing time and inventory. This means on-time deliveries, reduced lead times, and the ability to quickly adapt to design changes, new versions, or unexpected needs.

A just-in-time turning service requires organization, technology, and control: a well-structured raw materials warehouse, planning systems to monitor priorities and workloads, and a flexible production department capable of rapid setup changes. The process is completed by rigorous quality controls, ensuring dimensional consistency, material traceability, and constant compliance with customer requirements.

Sarbo: your partner for turning services

Reliability, precision, and technology are the hallmarks of Sarbo. Thanks to state-of-the-art machinery, the company provides an automatic turning service capable of supporting businesses in the production of high-quality turned small metal parts. Production performance is constantly monitored through the OEE (Overall Equipment Effectiveness) system, which allows real-time analysis of plant efficiency and timely intervention to improve performance. Machining processes follow the principles of Lean Production and Six Sigma methodology, aiming to reduce waste, optimize costs, and maintain high quality standards.

Sarbo guarantees complete support: from the initial technical consultancy to just-in-time delivery, ensuring the collaboration of a partner with in-depth knowledge of production processes, material characteristics, and supply chain requirements.

Sarbo’s CNC turning service also includes customized packaging based on each customer’s needs, scheduled material storage to ensure constant component availability, and a logistics system capable of guaranteeing fast and on-time deliveries in real time.

Discover Sarbo’s turning services

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The choice of tools and cutting materials in aluminium turning

The use of specific tools for aluminium turning promotes chip removal and reduces burr formation, a particularly critical phenomenon in light alloys due to their tendency to adhere. In particular, the use of carbide inserts with non-stick coatings helps reduce wear and improve surface quality.
The most effective coatings include polycrystalline diamond (PCD), which is the optimal choice for high-volume production due to its exceptional resistance to abrasive wear, and titanium aluminium nitride (TiAlN), suitable for less intensive but still high-performing applications.
In aluminium turning it is essential to choose positive cutting angles and sharp geometries, which help avoid deformation and material build-up on the cutting edge.
To optimize both productivity and quality, it’s necessary to balance cutting speed, feed rate, and depth of cut. The material allows for high spindle speeds, but vibration and overheating must be avoided.

Operational challenges in aluminium turning

Vibration and overheating can compromise both the quality of the part and the tool’s lifespan. Vibrations are especially problematic when machining thin components or those with high length-to-diameter ratios.
Localised overheating can cause dimensional deviations during aluminium turning and residual deformation when cooling.
Using a suitable lubrication and cooling system helps to dissipate heat and remove chips from the cutting zone, improving surface finish and extending tool life.
Special care must be taken to ensure frequent cleaning of the work area, as chips tend to accumulate and may be re-aspirated into the machining system, causing surface scratches or tool damage. Implementing these solutions in aluminium turning also helps to optimise cycle times and reduce unplanned stops.

Aluminium automatic turning at Sarbo

Sarbo’s advanced equipment and know-how enable excellent results in automatic aluminium turning, with competitive costs and short lead times, without compromising quality standards.
Over the years, our company has developed specialised expertise in machining light alloys, optimising processes and parameters to maximise production efficiency and minimise waste, following Lean Production and Six Sigma principles.
Sarbo uses high-speed CNC lathes, with minimum quantity lubrication (MQL) or internal tool cooling. Aluminium can also be machined with mechanical multi-spindle lathes to achieve economies of scale for high-volume batches.
Real-time monitoring systems ensure consistency and quality throughout the automatic turning of aluminium alloys.
Performance is monitored daily using the OEE (Overall Equipment Effectiveness) system.

Discover Sarbo’s capabilities in aluminium and metal turning.

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How a CNC lathe works

The CNC lathe is a technology that combines automation, precision, and speed. Its operation is based on a simple principle: converting a digital program into real and perfectly coordinated movements of the machine’s mechanical components.
The programming software translates the part design into a series of numerical commands, which are then interpreted by the control unit. Using servo motors, high-precision devices that regulate the position and speed of the working axes, the tool moves along micrometric trajectories.
The spindle’s task is to hold and rotate the raw part, operating in perfect sync with the feed systems of the CNC lathe. This combination allows for extremely controlled material removal, producing smooth, regular surfaces. With sensors and feedback systems, every movement is continuously monitored and corrected in real time, ensuring full fidelity to the original design.

The CNC lathe and the advantage of repeatability

The strength of the CNC lathe lies in its ability to guarantee excellent repeatability. Every part produced faithfully reflects the design specifications, eliminating most of the variables tied to manual intervention. Unlike traditional lathes where the operator manually adjusts speed, depth of cut, and feed the CNC drastically reduces the margin of human error and optimizes processing times, increasing productivity. Once programmed, the same part can be reproduced hundreds or thousands of times with identical features and consistent quality. For companies relying on an automatic precision turning supplier, this means being able to count on steady, uniform deliveries and more reliable lead times.

The CNC lathe and its versatility

Another advantage that makes the CNC lathe a strategic asset for manufacturing metal small parts is its versatility. Creating complex geometries with manual lathes requires multiple machining stages and longer times. With CNC technology, it’s possible to perform a series of operations in a single setup operations that would otherwise require several machines and steps. This integration eliminates the need to reposition the part, dramatically reducing setup time and minimizing the risk of human error. The flexibility of the CNC lathe also enables a broader product range, opening up new application opportunities in sectors such as medical and automotive, which require components with complex shapes and high performance.

Sarbo’s excellence in precision turning

Sarbo is a benchmark in automatic and CNC turning, capable of delivering high productivity and absolute reliability at every stage of the process. It operates with technologically advanced equipment that is constantly upgraded to ensure the best performance and the highest precision. The machine fleet includes multi-spindle and twin-spindle CNC lathes, turning centers, and multi-spindle CNC lathes with robotic arms.
Thanks to the integration of robotic arms into its multi-spindle CNC lathes, Sarbo performs complex operations without the need for direct human intervention, ensuring smooth, safe, and continuous production. These machines represent the perfect blend of multi-spindle speed and multi-axis CNC precision. They enable efficient management of turning operations even on parts with complex geometry, increasing productivity and reducing costs.
The robotic arm automates operations such as loading and unloading, handling between different machining stages, and real-time inspection during production.

Operational efficiency and the quality of turning processes are constantly monitored through the implementation of the OEE system (Overall Equipment Effectiveness). Moreover, all manufacturing processes are optimized using Lean Production and Six Sigma methodologies to reduce waste and control costs. Parts machined on CNC lathes are manufactured strictly based on the customer’s drawing using high-quality materials.

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The intrinsic complexity of stainless steel turning

Compared to carbon steels, stainless steel stands out for its corrosion and high-temperature resistance, but it also brings greater machining difficulties.
Work hardening is likely the most critical factor to manage during stainless steel turning. This phenomenon causes rapid surface hardening of the material near the cutting zone, creating increasingly harsh machining conditions that can compromise both part quality and tool life.
The high toughness of stainless steel means greater resistance to plastic deformation, requiring higher cutting forces than traditional steels and generating greater mechanical stress on the machine–tool system. The formation of long and complex chips further complicates the automatic stainless steel turning process.
The chromium content in alloys above 10.5% also leads to the formation of a passive oxide layer, significantly affecting the material’s behavior during cutting.

Automatic stainless steel turning of austenitic steels

Austenitic steels, such as the 300 series alloys, are among the most commonly used due to their excellent corrosion resistance. However, their high ductility results in strong tendency to galling and burr formation during machining, making it difficult to maintain tight tolerances and consistent surface finishes. In addition, strain hardening can shorten tool life. During the automatic stainless steel turning process, areas affected by plastic deformation experience a rapid increase in hardness—up to 150% higher than initial values. This behavior requires machining strategies that minimize deformation zones and maintain stable cutting conditions to prevent localized work hardening.
Machining austenitic steels demands high-performance tools with geometries specifically designed to handle elevated cutting forces and long, tough chip formation.
Cutting parameters for stainless steel turning with austenitic alloys must be carefully calibrated to balance productivity and quality. Moderate cutting speeds help control temperatures in the cutting zone, while relatively high feed rates promote chip stability and reduce tool-workpiece contact time, limiting heat buildup.

Stainless steel turning of martensitic grades

Martensitic steels represent a particular category of stainless steels, characterized by high hardness and mechanical strength, achieved through heat treatments that generate a martensitic crystalline structure. These features place extreme stress on machines. Their lower ductility compared to austenitic steels results in a different chip formation mode—generally more brittle but capable of causing significant abrasive tool wear.
To handle these alloys, it is crucial to use lathes with high structural rigidity and to choose cutting tools with careful consideration of edge material properties. Lower cutting speeds help control tool wear and maintain dimensional stability during automatic stainless steel turning. Reduced feed rates lower cutting forces and improve surface finish.

Stainless steel turning of duplex alloys

Duplex stainless steels combine the corrosion resistance of austenitic grades with the mechanical strength of martensitic ones. However, this dual nature makes machining particularly challenging: high cutting edge stress and low thermal conductivity demand precise control of process parameters. The cutting parameters for duplex stainless steel turning must be carefully balanced to accommodate the material’s mixed structure. The high mechanical strength—often twice that of austenitic steels—requires significant cutting forces, which must be managed by selecting appropriate tools and optimizing process conditions.
Moderate cutting speeds ensure stable cutting conditions. Well-calibrated feed rates offer the best compromise between productivity and part quality.

Sarbo’s technologies and equipment for stainless steel turning

Successfully managing the complexity of stainless steel means turning a demanding material into a high-performance component. This is only possible through an integrated approach combining know-how, advanced technologies, and certified production processes.
Sarbo operates modern stainless steel turning centers, equipped with sophisticated control systems for real-time management of process parameters. The integration of cutting force monitoring systems enables immediate detection of abnormal conditions that could affect part quality or accelerate tool wear.
At Sarbo, performance is monitored through the OEE system (Overall Equipment Effectiveness), and stainless steel turning processes are developed using Lean Production and Six Sigma methodologies to minimize waste and optimize production costs.

Discover the quality of Sarbo’s stainless steel turning.

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