What are the factors you should consider before purchasing the right CNC machine tool for your manufacturing jobs?
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From vertical to horizontal milling machines and lathes, to 5-axis machining centers, and multi-axis turning centers, CNC machine tools come in a wide variety of sizes, functions and performance.
Available in different dimensions and axes, with varying levels of quality and automation, CNC machine tools are important assets in your manufacturing business.
To purchase the right machine tool for your manufacturing needs, here are five things you should consider.
First and foremost, you need to have a clear assessment of your current and future production needs to avoid buying an undersized machine or an over specified machine.
Ask yourself the following questions:
By asking yourself these questions, you can determine what performance and capabilities you’ll need as you move to the next stage.
With such a wide array of machine types available, you will need to consider the best fit for your manufacturing jobs.
From our decades of experience in manufacturing and selling high performance CNC machine tools, we find that experienced customers usually look at the following factors before they choose a machine:
If you need to make parts which require both turning and milling, we recommend that you consider multi-tasking machine tools like C1 or the upgrade version C2.
For high precision and complex positioning or simultaneous machining needs, do consider multi-axis machines like our 5-axis Machining Centers (M3-5AX, M4-5AX, or SIRIUS- 5AX) or Hwacheon’s newly launched D2-5AX, a new concept 5-Axis Vertical Machining Centre for “high mix low volume” manufacturing.
In developed industries where the highest precision and premium quality molds are made, we recommend either our SMART machines or SIRIUS Series. Both machine tool lines offer powerful roughing and precise finish machining capabilities.
#3 Understanding CNC Machine Tool Prices
With CNC machine tool costs ranging in price from tens of thousands to hundreds of thousands of dollars, machine purchases are often considered as high investments by manufacturing companies.
In working out your budget for your machine tool, you need to consider the options that you need. Most CNC machines come with commonly used options, with additional options for selection and other costs needed if you require greater manufacturing sophistication.
You need to also consider the trade-offs between price, quality and production output. A lower cost machine may be easier to stomach from the onset but may be unable to provide the speed and performance which your business demands. Conversely, overpaying for features which you do not need can affect your bottom-line.
Often overlooked are the parts and maintenance costs. In considering the right machine tool, you need to work out the life cycle costs of your investment.
A cheaper machine may be more expensive over its entire life span, due to the poorer quality of its machine parts. Breakdowns can also be frustrating for machine operators and owners, resulting in lost opportunity and foregone income.
Every field has its competition. Wherever possible, machine tool buyers will try to locate the best machine for their needs at the cheapest available price. Machines made in technology advanced countries tend to have a higher quality and durability and may be priced higher. However, these may have a longer lifespan and less downstream maintenance needed.
Beyond country of origin, you need to also look at where its parts are made and assembled. Some machine tool makers may be based in countries with a strong engineering tradition, but their component parts are made and assembled in other countries.
Unlike some Korean manufacturers of machine tools, Hwacheon fabricates its machine parts and assembles them in Korea. We do not mass produce our machines nor do we allow them to be assembled by OEM companies in Korea or other countries. This includes the design and production of the spindle – the heart of every CNC machine.
Symmetry and Geometry - CNC turning is particularly advantageous for parts with symmetrical geometries due to its rotational nature. Parts with rotational symmetry, such as shafts, cylinders, and discs, are ideally suited for CNC turning to ensure uniformity and precision.
Cylindrical & Round Shapes - Turned parts are inherently cylindrical or round, and either solid or hollow, primarily due to the nature of the turning process. This cylindrical form is well-suited for a wide range of applications across various industries, including automotive, aerospace, and manufacturing. Solid cylindrical parts, such as shafts and pins, provide structural support and transmit motion or power efficiently. Hollow cylindrical parts, like tubes and sleeves, offer lightweight construction and fluid passage capabilities.
Material Starting Form - CNC turning is especially suited for parts that can begin as bar stock or other cylindrical preforms. This starting form minimizes material waste and simplifies the machining process, as the cylindrical shape of the workpiece aligns naturally with the rotational motion of the lathe. Bar stock, typically available in various diameters and lengths, provides a cost-effective and readily available starting material for turned parts.
Complexity and Features - Despite its association with cylindrical shapes, CNC turning can efficiently produce parts with a wide range of complex features. Multi-axis machining and live tooling capabilities, enable the incorporation of intricate geometries such as threads, grooves, and chamfers directly during the turning process. Threads, essential for fasteners and fittings, can be accurately cut using specialized threading tools, ensuring precise pitch and depth control. Grooves, used for O-ring seats or decorative purposes, can be machined with high repeatability and surface finish using custom tooling configurations.
Material Compatibility - CNC turning is well-suited for machining a wide range of materials, including metals, plastics, and composites. It is particularly effective for softer materials like aluminum, brass, and plastics, as well as certain stainless steel and alloys. These materials exhibit favorable machinability characteristics when subjected to the cutting forces and temperatures generated during turning operations. CNC turning can achieve high-quality surface finishes and dimensional accuracy on these materials, making it an ideal choice for parts requiring excellent aesthetics or tight tolerances.
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Production Volume and Efficiency - The production volume of the parts can influence the decision to use CNC turning. While CNC milling may offer advantages for low-volume or prototype production due to its versatility and ability to handle complex geometries, CNC turning excels in high-volume production requirements. The rotational nature of turning allows for continuous and rapid machining of cylindrical parts, resulting in shorter cycle times and increased throughput compared to milling.
Tooling and Setup Requirements - CNC turning typically requires minimal tooling and setup compared to other machining processes, making it suitable for quick turnaround times and rapid production ramp-up. The primary tooling components in turning include cutting inserts, tool holders, and work-holding fixtures, which are relatively straightforward to set up and replace as needed. The simplicity of the turning process also reduces the risk of tool breakage or machine downtime, ensuring consistent and uninterrupted production.
Secondary Operations Integration - CNC turning allows for seamless integration of secondary operations such as drilling, tapping, and knurling within the same machining cycle. This capability eliminates the need for additional setups or transfers to secondary machines, reducing production lead times and costs. For example, tapped holes can be accurately machined directly on turned parts using live tooling attachments, ensuring precise thread alignment and dimensional accuracy.
Surface Finish Requirements - CNC turning can achieve excellent surface finishes on cylindrical and contoured surfaces, meeting the stringent requirements of various applications such as automotive, aerospace, and medical devices. The cutting tools used in turning generate consistent cutting forces and chip formation patterns, resulting in smooth and uniform surface textures.
Cost Considerations - When evaluating the suitability of CNC turning for specific parts, it's essential to consider cost factors such as material expenses, machine utilization rates, and labor requirements. CNC turning offers competitive pricing advantages for parts that align with its strengths, such as cylindrical geometries, high-volume production, and minimal setup complexity. By optimizing tooling strategies, minimizing material waste, and maximizing machine uptime, manufacturers can leverage CNC turning to achieve cost-effective production solutions without compromising on part quality or performance.
Are you in need of precision CNC turning services for your next project? Look no further than Komacut. With our extensive expertise in creating CNC turned and machined parts, as well as our modern facilities, instant quoting and large technical team, whether you require simple cylindrical components or complex geometries, we have the capabilities and experience to meet your exact specifications.
At Komacut, we understand the importance of delivering high-quality parts on time and within budget. Our team of skilled machinists and engineers is dedicated to providing superior craftsmanship and attention to detail in every project we undertake.
Don't settle for anything less than the best when it comes to CNC turning. Get a true instant quote online for up to 100k parts, in different materials and with different surface finishes in seconds, or reach out to discuss your project requirements and discover how we can help bring your vision to life with precision and reliability. Let us be your trusted partner in machining excellence.
What materials can be used in CNC turning?
CNC turning can accommodate a wide range of materials, including metals, plastics, and composites. Common materials used in CNC turning include aluminum, brass, stainless steel, carbon steel, titanium, copper, and various engineering plastics such as nylon, acetal, and polycarbonate. CNC turning can also machine specialty materials like ceramics, fiberglass, and certain types of wood, depending on their machinability characteristics and application requirements.
How does CNC turning compare to CNC milling?
CNC turning and CNC milling are both subtractive manufacturing processes that use computer numerical control (CNC) machines to shape workpieces into finished parts. The key difference lies in how the cutting tool and workpiece interact: in CNC turning, the workpiece rotates while the cutting tool remains stationary, whereas in CNC milling, the cutting tool rotates while the workpiece remains stationary.
Can CNC turning produce parts with non-cylindrical features?
While CNC turning is commonly associated with cylindrical parts due to its rotational nature, it can also produce parts with non-cylindrical features using advanced machining techniques and tooling configurations. For example, CNC turning machines equipped with live tooling capabilities can perform secondary operations such as drilling, milling, and threading during the turning process, enabling the creation of complex geometries like grooves, slots, and angled surfaces.
What are the tolerances achievable with CNC turning?
CNC turning can achieve tight tolerances and high precision, making it suitable for applications that demand dimensional accuracy and consistency. CNC turning can achieve tolerances ranging from ±0.001 to ±0.005 inches (±0.025 to ±0.127 millimeters) for most metals and plastics. However, tighter tolerances down to ±0. inches (±0.013 millimeters) or even better can be achieved with careful process optimization, precision tooling, and advanced machining techniques.
What are the advantages of CNC turning over traditional manual turning?
CNC turning machines can operate continuously, 24/7, without the need for operator intervention, leading to higher productivity and reduced labor costs. CNC turning offers increased efficiency, repeatability, and versatility compared to traditional manual turning techniques.
How does CNC turning contribute to reducing material waste and increasing material utilization?
CNC turning machines can precisely control cutting depths and tool paths, minimizing excess material removal and maximizing part yield from raw material stock. CNC turning allows for efficient nesting and clustering of parts on the workpiece, reducing scrap and maximizing material usage per machining cycle.
How does CNC turning accommodate parts with varying complexity levels?
For less complex parts, CNC turning can efficiently produce features such as outer diameters, inner bores, and facing operations using standard turning tooling and techniques. For more complex parts requiring additional features or secondary operations, CNC turning machines equipped with live tooling, sub-spindles, and multi-axis capabilities can perform drilling, milling, tapping, and thread-cutting operations directly on the turning center.
What considerations should be made when selecting cutting tools for CNC turning?
Tool material and coating selection should be based on the workpiece material being machined, with carbide, cermet, and high-speed steel being common options. Additionally, tool geometry, including rake angle, clearance angle, and chip breaker design, should be chosen to match the specific machining application and material properties. Cutting tool inserts with high wear resistance and thermal stability can prolong tool life and reduce machining costs.
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