SR-20JII Type A/B
CNC Swiss-type Automatic Lathe

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The SR-20JII Type A/B CNC swiss lathe combines advanced Swiss-type CNC technology with high-speed, precision machining, making it ideal for a wide range of small, intricate parts.With its versatile design, this lathe allows for seamless turning, milling, and drilling operations, maximizing productivity.

  • Spindle speeds up to 10,000 RPM
  • Accommodates up to 30 tool stations for complex part production
  • Multi-axis control for simultaneous machining with main and sub-spindle
10,000 RPM | 20 mm Bar Capacity | 7 Axis | 30 Tool Stations

Lathe

SR-20JII Type A/B CNC Swiss-type Automatic Lathe Specifications and Accessories Overview

The SR-20JII Type A/B is designed for precision and versatility, offering a maximum machining diameter of 20mm, with the option to extend it to 23mm. The machine features a 205mm headstock stroke, and both C-axis control and 10,000 RPM spindle speeds for precise secondary machining. Its 5-spindle sleeve holder and 8-station backworking unit with Y-axis control (Type B) provide robust tooling capacity, enabling the machine to handle complex part production with ease.

With a slanted dovetail construction on the tool post, the SR-20JII ensures high rigidity, making it ideal for machining tough materials. The 8,000 RPM power-driven tools in the cross milling unit and flexible spindle configurations allow the machine to handle multi-process tasks efficiently, reducing cycle times and boosting productivity. Whether you require high-volume production or intricate part fabrication, the SR-20JII Type A/B delivers exceptional performance and adaptability.

Read the full technical specifications below. To learn more or get your custom quote today, contact us and discover how the SR-20JII Type A/B can elevate your operations. 

  • Max. Machining Diameter

    ø20mm (25/32in) OP: ø23mm (29/32in)

  • Max. Headstock Stroke

    STANDARD
    205mm (8in)

    R.M.G.B Type
    160mm (6-19/64in)

    N.G.B. Type
    Bar diameter x 2.5 (Max. 50mm) (Max. 1-31/32in)

  • Tool

    NUMBER OF TOOLS
    6 tools

    TOOL SHANK
    12mm

  • 5-Spindle Sleeve Holder

    NUMBER OF TOOLS
    Front 5 tools
    Rear 5 tools

    MAX. DRILLING CAPABILITY
    ø12mm (1/2in)

    MAX. TAPPING CAPABILITY
    M10 x P1.5

  • 2-Spindle Front Sleeve Holder

    NUMBER OF TOOLS (SLEEVE)
    2 tools

    MAX. DRILLING CAPABILITY
    ø10mm (25/64in)

    MAX. DEPTH OF HOLE
    100mm (3-15/16in)

  • Power-Driven Attachment

    NUMBER OF TOOLS
    Cross Milling 3 tools (ER16 + Cartridge Type 2 Pos.
    Cross milling 3 tools (ER20 x 1, ER16 x 2) + Cartridge Type 2 Pos.

    MAX. DRILLING CAPABILITY
    ø10mm (25/64in)

    MAX. TAPPING CAPABILITY
    M8 x P1.25

    SPINDLE SPEED
    Max. 8,000min-1

    DRIVE MOTOR
    2.2kW

  • Rapid Feed Rate

    35m/min (X1, X2, Z1, Z2), 24m/min(Y2) : type B only

  • Main Spindle Indexing Angle

    C-axis control

  • Main Spindle Speed

    Max. 10,000min-1

  • Main Spindle Motor

    2.2kW (continuous) / 3.7kW (10min./25%ED)

  • Coolant Tank Capacity

    202ℓ

  • Dimensions (W x D x H)

    2,250 X 1,200 X 1,700mm

  • Weight

    2,750kg

  • Power Consumption

    4.8kVA

  • Maximum Chucking Diameter

    ø20mm (25/32in) OP: ø23mm (29/32in)

  • Max. Length for Front Ejection

    100mm (3-15/16in)

  • Max. Part Projection Length

    30mm (1-3in/16 in)

  • Unit Especially for Backworking

    NUMBER OF TOOLS
    8 Tools (Type B) & 4 Tools (Type A)

    MAX. DRILLING CAPABILITY
    Stationary Tool
    ø12mm (1/2in)
    Power-Driven Tool
    ø6mm (15/64in)

    MAX. TAPPING CAPABILITY
    Stationary Tool
    M10 x P1.5
    Power-Driven Tool
    M5 x P0.8

  • Power-driven Attachment Spindle Speed

    Max. 8,000min-1

  • Power-driven Attachment Drive Motor

    1.0kW

  • Sub-Spindle Min. Indexing Angle

    C-axis control

  • Sub-Spindle Speed

    Max. 10,000min-1

  • Sub-Spindle Motor

    2.2kW (continuous) / 3.7kW (10min/25%ED)

  1. CNC Unit FANUC 32i-B
  2. Operation panel 10.4 inch color LCD display
  3. Pneumatic unit
  4. Coolant level detector
  5. Automatic centralized lubrication unit
  6. Door interlock system
  7. Cs contouring control (Main/Sub)
  8. Spindle clamp unit (Main/Sub)
  9. Revolving guide bush unit
  10. Drive unit for revolving guide bush
  11. Air purge for revolving guide bush
  12. Main/Sub Collet
  13. 6-Station tool holder (12mm)
  14. Cross drilling unit (gang type tool post)
  15. 5-Spindle sleeve holder
  16. Broken cutoff tool detector
  17. Backworking attachment
  18. 4-spindle backworking unit (Type A)
  19. 8-Spindle backworking unit with Y axis control function (Type B)
  20. Parts conveyor
  21. Sub spindle air purge unit
  22. Sub spindle air blow unit
  23. Drive unit for power-driven attachment (8-spindle backworking unit) (Type B)
  24. Work light
  25. Leakage breaker
  1. Coolant flow detector
  2. Water removal unit
  3. Oil mist filter
  4. Beacon
  5. Main spindle inner tube
  6. Feed arrow steady rest
  7. Rotary magic guide bush unit
  8. Non-guide bush type
  9. Drive unit for power-driven attachment B (4-spindle backworking unit- Type A)
  10. Parts ejector (Spring type)
  11. Parts ejector (Air cylinder type)
  12. Parts ejector with guide tube
  13. Parts stopper unit
  14. Coolant unit (6.9MPa/2.5MPa/0.7MPa)
  15. Coolant unit signal cable
  16. Coolant unit power cable
  17. Coolant valve
  18. Coolant pipings
  19. Automatic bar feeder interface
  20. LAN/RS232C interface
  21. Transformer
SR-20JII Type A/B CNC swiss lathe
SR-20JII Type A/B

SR-20JII

Discover the power of the SR-20JII Type A/B 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 SR-20JII Type A/B !

How Can the SR-20JII Type A/B Improve Your Machining Process?

Process

The SR-20JII Type A/B CNC Swiss-Type Automatic Lathe offers several significant enhancements that can transform your machining process. One of its standout features is its increased flexibility, allowing for a broad range of machining operations and configurations. This flexibility is supported by the switchable Guide Bush/Non-Guide Bush system, offering adaptability for different material types and production requirements, while reducing material waste.

The lathe’s high rigidity and accuracy come from its slanted dovetail slideway structure, ensuring stable and precise tool positioning, even during high-speed operations. With main and sub spindles both reaching speeds of up to 10,000 RPM, the machine is optimized for efficient and accurate machining of small, intricate parts across various industries.

A notable advantage is the large tooling capacity, featuring up to 8 tools for backworking (Type B) and 4 tools for Type A, enabling complex operations to be completed in a single setup. The inclusion of power-driven attachments, such as cross-milling tools and deep-hole drilling stations, significantly expands its capabilities, making it ideal for high-precision tasks.

The FANUC 32i-B control system with C-axis control on both spindles ensures advanced operational precision and flexibility, while the rapid feed rates and high-speed spindle motors reduce cycle times, boosting overall productivity.

Additional standard features like the automatic centralized lubrication unit, coolant level detector, and broken cut-off tool detector further enhance the lathe’s reliability and ease of use. Combined with its ability to run autonomously for extended periods with minimal operator intervention, the SR-20JII becomes a cost-effective solution for improving machining accuracy and efficiency. To see how the SR-20JII can enhance your production process, contact us for a custom quote today and let our specialists help you find the perfect solution for your specific needs.

5-Spindle Cross Drilling Unit Tooling Variations for Enhanced Machining

Spindle

The 5-spindle cross drilling unit offers versatile tooling configurations to enhance multi-tasking capabilities in complex machining operations. Each diagram showcases different tooling variations, such as the milling unit for ER16 x 2, illustrating the strategic placement and alignment of tools for maximum efficiency. These configurations enable seamless integration of drilling, milling, and tapping operations, reducing cycle times and increasing productivity across diverse applications. With the flexibility provided by these setups, manufacturers can tackle intricate part geometries with ease and precision.

Diagram of a 5-spindle cross drilling unit showcasing tooling variations. The image features a milling unit with tooling configuration for ER16 x 2, highlighting the placement and alignment of tools within the unit.
Diagram of a 5-spindle cross drilling unit showcasing tooling variations. The image features a milling unit with tooling configuration for ER16 x 2, highlighting the placement and alignment of tools within the unit.
Diagram of a 5-spindle cross drilling unit showcasing tooling variations. The image features a milling unit with tooling configuration for ER16 x 2, highlighting the placement and alignment of tools within the unit.
Diagram of a 5-spindle cross drilling unit showcasing tooling variations. The image features a milling unit with tooling configuration for ER16 x 2, highlighting the placement and alignment of tools within the unit.
Diagram of a 5-spindle cross drilling unit showcasing tooling variations. The image features a milling unit with tooling configuration for ER16 x 2, highlighting the placement and alignment of tools within the unit.
Diagram of a 5-spindle cross drilling unit showcasing tooling variations. The image features a milling unit with tooling configuration for ER16 x 2, highlighting the placement and alignment of tools within the unit.

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 SR-20JII Type A/B CNC Swiss-type Automatic Lathe

FAQ

The SR-20JII Type A/B CNC Swiss-Type Automatic Lathe is engineered to deliver exceptional precision and versatility for a wide range of machining tasks. With its flexible tooling options and innovative design, this machine is ideal for high-precision industries like medical devices, automotive, and electronics. To help you better understand the unique capabilities and features of the SR-20JII, we’ve compiled a list of frequently asked questions below. 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 SR-20JII Type A and Type B?

The main differences between the SR-20JII Type A and Type B models lie in their tooling configurations and capabilities. Type B features an 8-station back-working unit with Y-axis control, which provides additional flexibility for complex machining tasks. In contrast, Type A has a 4-spindle back-working unit without Y-axis control. This means that Type B can perform more complex and precise operations, especially for back-working, compared to Type A.

The SR-20JII and the SD-26 are both CNC Swiss-type automatic lathes, but they may differ in terms of their maximum machining diameters, tooling configurations, spindle speeds, and other specific features. Typically, the SR-20JII is designed for high precision and flexibility with its advanced tooling options and control systems, while the SD-26 may cater to different machining requirements. For a direct comparison, one would need to review the specific model specifications of the SD-26, as these details are not provided in the current context.

Industries that require high precision and flexibility in machining small to medium-sized complex parts benefit the most from the SR-20JII’s features. This includes the medical equipment industry, aerospace sector, automotive components manufacturing, electronics, and precision engineering. The machine’s advanced tooling and control systems make it ideal for producing intricate parts with tight tolerances. Contact our specialist for more technical details.

Yes, the SR-20JII is designed to handle large-scale production efficiently. Its robust construction, high-speed capabilities, and advanced control systems enable it to maintain precision over long production runs. The machine’s automation features, such as the automatic centralized lubrication unit and parts conveyor, also contribute to its ability to run continuous production cycles with minimal downtime. Did you download CNC Swiss type automatic lathe brochure

The SR-20JII features several key improvements over the SR-20J model, including increased flexibility with more tooling configurations, enhanced rigidity for improved accuracy, and the addition of a Y-axis control in the 8-station back-working unit for Type B. These enhancements allow for more complex and precise machining operations. The SR-20JII also likely incorporates the latest advancements in CNC technology, offering improved speed, efficiency, and user-friendly controls.