ST-20
CNC Swiss-type Automatic Lathe

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The ST-20 CNC Swiss-type Automatic Lathe is a high-precision machine engineered for complex machining operations on small to medium-sized parts. Designed to enhance productivity and precision, it supports multiple operations such as turning, milling, and drilling in a single setup, reducing cycle times and improving overall efficiency. The ST-20 features spindle speeds up to 10,000 RPM, offering high-speed machining, and accommodates a 20mm bar capacity for versatility across various applications.

  • Spindle speeds up to 10,000 RPM
  • 20mm Bar Capacity
  • 8 Station Tool Post with 5 Backworking Tools
  • Simultaneous Machining on Main and Sub-Spindle
10,000 RPM | 20 mm Bar Capacity | 7 Axis | 13 Tool Positions

Lathe

ST-20 CNC Swiss-type Automatic Lathe Specifications and Accessories Overview

The ST-20 boasts an impressive array of features and technical capabilities designed to handle complex, high-precision machining tasks. With a maximum machining diameter of 20mm and a 350mm headstock stroke, the ST-20 offers ample flexibility for a variety of part sizes. The lathe is equipped with 3 ultra-high-speed turrets that support simultaneous turning and milling operations, drastically reducing cycle times. Each turret includes 8 stations with the capacity to mount up to 3 tools per station, enabling seamless multi-processing for enhanced productivity.

Both the main spindle and sub-spindle are capable of reaching speeds of 10,000 RPM, ensuring smooth and accurate performance, even for difficult-to-machine materials. The 8-station backworking unit allows for complex part production in a single operation, further increasing efficiency. Additional features like C-axis control, high-pressure coolant interface, and a 213-liter coolant tank ensure the machine runs efficiently while maintaining consistent high-quality output.

Read the full technical specifications below. To learn more or to get your custom quote today, contact us and discover how the ST-20 CNC Swiss-Type Automatic Lathe can elevate your operations. 

  • Max. Machining Diameter

    ø20mm (25/32in)

  • Max. Headstock Stroke

    STANDARD
    350mm (13-25/32in)

    R.M.G.B. UNIT
    317mm (12-31/64in)

  • Front Working Turret Tool Post

    FRONT SIDE TURRET
    8 stations

    REAR SIDE TURRET
    8 stations

  • Number of Turning Tools

    Max. 3 tool/station

  • Tool Shank

    12mm/16mm

  • Sleeve Holder

    NUMBER OF TOOLS
    Max. 3 tools/station

    MAX. DRILLING CAPABILITY
    ø14mm (35/64in)

    MAX. TAPPING CAPABILITY
    M10 x P1.5

  • Power-Driven Att.

    NUMBER OF TOOLS
    Max. 2 tools/station

    MAX. DRILLING CAPABILITY
    ø8mm (5/16in)

    MAX. TAPPING CAPABILITY
    M6 x P1.0

    SPINDLE SPEED
    Max. 5,750min-1

    DRIVE MOTOR
    2.5kw

  • Rapid Feed Rate

    30m/min (X1, X2 ,X3, Z1, Z2, Z3)
    15m/min (Y1, Y2, Y3), 3.9m/min (YA2)

  • Main Spindle Indexing Angle

    C-axis control

  • Main Spindle Speed

    Max. 10,000min-1

  • Main Spindle Motor

    3.7kw (continuous) / 5.5kw (10min/60%ED)

  • Coolant Tank Capacity

    213ℓ

  • Dimensions (W x D x H)

    2,988 x 1,720 x 1,845mm

  • Center Height

    1,083mm (including leveling pads)

  • Weight

    4,850kg

  • Power Consumption

    8.5KVA

  • Max. Chucking Diameter

    ø20mm (25/32in)

  • Max. Part Pick-Up Length

    150mm (5-7/8in)

  • Max. Part Projection Length

    75mm (2-15/16in)

  • Back Working Turret Tool Post

    8 station

  • Number of Turning Tools

    Max. 3 tool/station

  • Sleeve Holder

    NUMBER OF TOOLS
    Max. 3 tools/station

    MAX. DRILLING CAPABILITY
    ø14mm (35/64in)

    MAX. TAPPING CAPABILITY
    M10 x P1.5

  • Power-Driven Att.

    NUMBER OF TOOLS
    Max. 2 tools/station

    MAX. DRILLING CAPABILITY
    ø8mm (5/16in)

    MAX. TAPPING CAPABILITY
    M6 x P1.0

    SPINDLE SPEED
    Max. 5,750min-1

    DRIVE MOTOR
    2.5kw

  • Sub-Spindle Indexing Angle

    C-axis control

  • Sub-Spindle Speed

    Max. 10,000min-1

  • Sub-Spindle Motor

    3.7kw (continuous) / 5.5kw (10min./60%ED)

  • Tool Shank

    12mm/16mm

  1. CNC Unit Fanuc 31i-B5
  2. Operation panel 10.4 color LCD display
  3. Hydraulic unit
  4. Pneumatic unit
  5. Automatic centralized lubrication unit
  6. Coolant level detector
  7. Door interlock system
  8. Broken cutoff tool detector
  9. Parts ejection detector
  10. Drive unit for revolving guide bush
  11. Revolving guide bush unit
  12. Main/Sub collet
  13. C-Axis control (main/sub)
  14. Spindle clamp unit (main/sub)
  15. Main spindle cooling unit
  16. Coolant chiller
  17. Drive system for power-driven attachment (turret)
  18. Air purge for revolving guide bush
  19. Sub spindle air purge unit
  20. Sub spindle air blow
  21. Parts separator
  22. Parts conveyor
  23. Automatic bar feeder interface
  24. High pressure coolant interface
  25. Work light
  26. Leakage breaker
  1. Coolant flow detector
  2. Water removal unit
  3. Beacon
  4. Rotary magic guide bush unit
  5. For pneumatic unit rotary magic guide bush
  6. Parts ejector (Air cylinder type)
  7. Parts ejector (Spring type rotary version)
  8. Parts ejector with guide tube
  9. Parts stopper unit
  10. Coolant unit (6.9MPa/2.5MPa/0.7MPa)
  11. Coolant unit signal cable
  12. Coolant unit power cable
  13. Coolant valve
  14. Coolant pipings
  15. Manual pulse generator
  16. Transformer CE marking version
  17. Tool presetter
ST-20 CNC Swiss Lathe

ST-20

Discover the power of the ST-20 CNC Swiss-type Automatic Lathe! Download our brochure to learn about its features and specifications. If you have questions or need more info, just submit your request, and our team will help you. Elevate your production with the ST-20 !

How Can the ST-20 CNC Swiss Lathe Improve Your Machining Process?

Process

The ST-20 CNC Swiss-Type Automatic Lathe enhances your machining process through simultaneous machining capabilities, enabling turning and milling operations to occur concurrently using its opposing twin turret tool posts. This drastically reduces cycle times, allowing for faster production without compromising precision. Both the main and sub spindles offer identical machining power, supporting complex part production in a single setup with minimal manual intervention, thus improving overall efficiency.

The machine’s high-speed operations, with spindle speeds reaching 10,000 RPM and rapid feed rates of 30m/min, ensure fast and precise material removal, making it ideal for high-volume production environments. The 8-station front and rear turrets allow for a wide range of tooling configurations, increasing flexibility in handling multi-process operations.

Incorporating advanced features like thermal displacement suppression and a cutting oil cooling unit, the ST-20 maintains high precision by reducing vibration and stabilizing temperatures, ensuring tight tolerances even during extended runs. These capabilities make the ST-20 perfect for industries such as medical, aerospace, and automotive, where accuracy and consistency are paramount.

By reducing setup times and allowing for faster changeovers, the ST-20 also improves operational efficiency, making it a valuable asset for both short-run and long-run production. The result is higher throughput, reduced downtime, and cost-effective manufacturing without sacrificing quality. Contact us today for a custom quote and discover how the ST-20 can transform your operations.

Why Choose Star Swiss-Style Lathes?

Star CNC Machine Tool Corp., a division of Star Micronics Co., Ltd. of Japan, is a global leader in Swiss-type turning machines, known for producing small, complex, and precise metal components. Since 1948, Star CNC has delivered reliable, high-performance lathes that excel in both high-volume production and intricate part fabrication.

Their mission is to develop fast, efficient, and robust machines that meet the demands of today’s 24/7 production environments, with a focus on ergonomics, safety, and environmentally-friendly operations.

AMT Machine Tools Ltd. is the Canadian distributor of Star CNC, offering full access to their advanced lathes and comprehensive support. Explore our Star Swiss-style lathe page or contact us for more information.

Frequently Asked Questions about the ST-20 CNC Swiss-type Automatic Lathe

FAQ

The ST-20 CNC Swiss-type Automatic Lathe represents a significant advancement in precision machining technology, offering a robust platform for high-speed, high-accuracy production of complex parts. With its Swiss-type design, the ST-20 is engineered to handle intricate operations with ease, making it a valuable asset for industries requiring the utmost in precision and efficiency. To help you better understand the capabilities and features of this machine, we provide you with a list of frequently asked questions.

These questions cover a range of topics, from the machine’s performance compared to other models, such as the SD-26, to its productivity benefits, industry applications, 5-axis machining capabilities, and typical use cases in manufacturing. If you need more information or have specific inquiries, please feel free to contact us for personalized support. 

What are the main differences between the ST-20 and SD-26 models?

The ST-20 offers a maximum machining diameter of 20mm (25/32in), while the SD-26 can handle larger diameters up to 26mm (1-1/64in). Additionally, the ST-20 features twin turret tool posts for simultaneous machining, which reduces cycle times, while the SD-26 is equipped with double B-axis programmable units, allowing for more complex 5-axis operations. Both machines excel in precision, but the ST-20 is focused more on speed and efficiency for high-volume production, whereas the SD-26 specializes in intricate, complex machining.

The ST-20 excels in productivity with its simultaneous turning and milling capabilities. Its twin turret design allows for multiple operations to be performed at once, drastically reducing cycle times. This makes it one of the most efficient Swiss-type lathes for high-volume production. The rapid feed rates of 30m/min and high-speed spindles further enhance throughput, positioning the ST-20 as a leader in productivity when compared to other lathes in its class.

The ST-20 is ideal for industries that require precision and high-speed machining. This includes the medical device, aerospace, automotive, and electronics industries, where complex components need to be produced with tight tolerances in large volumes. Its ability to handle multi-process operations in a single setup makes it perfect for manufacturing environments with high productivity demands. Contact our specialist for more technical details.

While the ST-20 does not feature full 5-axis capabilities, it compensates with simultaneous multi-axis machining using its twin turret tool posts and C-axis control on both the main and sub spindles. This allows for highly efficient and precise machining operations, even for complex components, though it is more focused on speed and high throughput rather than intricate 5-axis operations. Did you download CNC Swiss type automatic lathe brochure

The ST-20 is commonly used for the production of small, complex parts with high precision in industries like medical, automotive, and electronics. It’s particularly suited for parts requiring simultaneous turning and milling, where fast cycle times and consistent quality are critical. Typical applications include precision medical devices, automotive components, and electronic hardware, where high-speed, high-volume production is essential.