SR-20R IV Type A & B
CNC Swiss-type Automatic Lathe

Home | Star CNC Machine Tool | Star CNC SR-20R IV Type A & B

The SR-20R IV Type A & B CNC Swiss Lathe is designed for high-precision, high-speed machining, perfect for producing intricate small parts. With its advanced Swiss-type CNC technology, this lathe excels in versatile operations such as turning, milling, and drilling, providing superior performance for complex production needs.

  • Spindle speeds up to 10,000 RPM
  • Capable of handling up to 41 tool positions for maximum flexibility
  • Multi-axis control with simultaneous machining on the main and sub-spindle
10,000 RPM | 20 mm Bar Capacity | 8 Axis | 41 Tool Stations

Lathe

SR-20R IV Type A & B CNC Swiss-type Automatic Lathe Specifications and Accessories Overview

The SR-20R IV Type A/B boasts advanced machining capabilities with a maximum machining diameter of 20mm and a headstock stroke of 205mm, providing a high level of versatility for various small part applications. The machine’s 27-position tool station and backworking 8-spindle unit offer extensive tooling options, enhancing its ability to handle complex machining processes in a single setup.

Equipped with B-axis control and C-axis control for both the main and sub spindles, the SR-20R IV ensures precise secondary operations, reducing the need for multiple setups and increasing productivity. With spindle speeds of up to 10,000 RPM for both the main and sub spindles and a rigid construction for stability, this machine delivers exceptional accuracy and extended tool life. The Star Motion Control System optimizes performance, enabling the SR-20R IV to meet the most demanding production requirements.

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

  • Max. Machining Diameter

    ø20mm (25/32in)

  • Max. Headstock Stroke

    STANDARD
    205mm (8in)

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

    NON-GUIDE BUSH TYPE
    Bar diameter x 2.5 (max. 50mm) (max. 1-31/32in)

  • Tool

    5 tools on the front + 2 tools on the rear (12mm)

  • 4-Spindle Sleeve Holder

    NUMBER OF TOOLS
    Front 4 tools / Rear 4 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 (3-15/16 in)

  • Power Driven Attachment

    NUMBER OF TOOLS
    Cross Milling: 3 tools
    Cartridge Type: At 2 position

    NUMBER OF TOOLS (TYPE A)
    Angle adjustable power-driven tool: At 1 position (front 3 tools + rear 3 tools)

    NUMBER OF TOOLS (TYPE B)
    B-axis controlled power-driven tool unit: At 1 position (front 3 tools + rear 3 tools)

    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-1 (X1, X2, Y1, Z1, Z2), 15m/min-1 (Y2)

  • Main Spindle Indexing Angle

    C-axis control

  • Main Spindle Speed

    Max. 10,000min-1

  • Main Spindle Motor

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

  • Coolant Tank Capability

    170ℓ

  • Dimensions (W x D x H)

    2,334 x 1,200 x 1,700mm

  • Weight

    2,600kg

  • Power Consumption

    4.7KVA

  • Max. Chucking Diameter

    ø20mm (25/32in)

  • Max. Length for Front Ejection

    80mm (3-5/32in)

  • Max. Parts Projection Length

    30mm (1-3/16in)

  • Back 8-Spindle Unit

    NUMBER OF TOOLS
    Stationary Tool: 8 tools
    Power Driven Tool: 8 tools

    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 (continuous)/1.2kw (5min./30%ED)

  • Sub Spindle Indexing Angle

    C-axis control

  • Sub Spindle Speed

    Max. 10,000min-1

  • Sub Spindle Motor

    Built-in motor drive 2.2kw (continuous) / 3.7kw (10min/25% ED)

  1. CNC unit Fanuc 31i-B (Type A)
  2. CNC unit Fanuc 31i-B5 (Type B)
  3. Pneumatic unit
  4. Automatic centralized lubrication unit
  5. Coolant level detector
  6. Door interlock system
  7. Broken cutoff tool detector
  8. Parts ejection detector
  9. Drive unit for revolving guide bush
  10. Revolving guide bush unit
  11. Main/Sub collet
  12. C-axis control (main/sub)
  13. Spindle clamp unit (main/sub)
  14. 5-station tool holder (12mm)
  15. 2-station tool holder (12mm)
  16. Main tool post tool rotation drive unit
  17. Cross milling tool unit (3-tool type)
  18. Angle adjustable power-driven tool unit (Type A)
  19. B-axis controlled power-driven tool unit (Type B)
  20. 4-spindle sleeve holder
  21. Back 8-spindle unit
  22. Drive unit for power-driven attachment B
  23. Y-axis control for back-working tool post
  24. Parts ejector (Spring type)
  25. Parts conveyor
  26. Air purge for revolving guide bush
  27. Sub spindle air purge unit
  28. Sub spindle air blow unit
  29. Work light
  30. Leakage breaker
  1. Coolant flow detector
  2. Water removal unit
  3. Beacon
  4. Parts receptacle in the machine
  5. Parts separator unit A
  6. Main spindle inner tube
  7. Parts ejector (air cylinder type)
  8. Rotary magic guide bush unit
  9. Parts ejector with guide tube
  10. Parts stopper unit
  11. Coolant unit 2.5MPa
  12. Coolant unit 6.9MPa
  13. Coolant pipings
  14. Oil-hole drill type
  15. Automatic bar feeder interface
  16. Compliant with the RS-232C interface
  17. Transformer
  18. Safety relay module version
  19. Transformer CE marking version
  20. Transformer CE marking specifications

SR-20R IV

Discover the power of the SR-20R IV 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-20R IV Type A & B !

How Can the SR-20R IV Type A & B CNC Swiss Lathe Improve Your Machining Process?

Process

The SR-20R IV Type A & B CNC Swiss Lathe is a game-changer for any machining operation, offering unmatched precision, versatility, and efficiency. With a maximum machining diameter of ø20mm and a 205mm headstock stroke, it easily adapts to a variety of machining tasks, making it ideal for industries requiring high accuracy and tight tolerances. The 27-position tool station, accommodating up to 41 tools, paired with a full B-axis for cross drilling and milling and a Y-axis controlled backworking unit, enables the machine to perform complex multi-process operations in a single setup, reducing cycle times and improving productivity.

SR-20R IV Type A & B CNC Swiss Lathe

Its rigid construction ensures stability for maintaining close tolerances, while the built-in motor and sensor improve indexing accuracy. This results in extended tool life and reduced downtime, which is crucial for maintaining operational efficiency. Additionally, the Star Motion Control System enhances operability, allowing for higher precision and smoother transitions between tasks, making it an invaluable asset for industries like medical devices, aerospace, and automotive.

By integrating multiple processes into one machine with advanced control systems and robust tooling capacity, the SR-20R IV helps streamline production, reduce setup times, and deliver consistent high-quality output. For a more detailed discussion on how this lathe can optimize your specific machining needs, contact our specialists for a personalized consultation.

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-20R IV Type A & B CNC Swiss-type Automatic Lathe

FAQ

The SR-20R IV Type A & B CNC Swiss-type Automatic Lathe is a high-performance machine designed for the precision machining of small-to-medium-sized parts. It features multi-axis control and simultaneous machining capabilities on both the main and sub-spindles, making it ideal for complex parts. With a bar capacity of up to 20mm (expandable to 25mm) and spindle speeds up to 10,000 RPM, this lathe ensures exceptional accuracy and efficiency. It is well-suited for industries such as automotive, medical, aerospace, and electronics, where high-precision components are required. This FAQ section aims to address common questions about the SR-20R IV’s features, capabilities, and applications. If you have further questions, please feel free to contact us for personalized assistance!

Which industries benefit the most from using the SR-20R IV Type A & B lathe?

The SR-20R IV is widely used across various high-precision industries such as medical, aerospace, automotive, and electronics. It is particularly well-suited for applications requiring the production of small, intricate parts, such as medical implants, surgical instruments, connectors, and precision automotive components. The machine’s ability to perform complex operations in a single setup makes it a valuable asset for manufacturers looking to produce high-precision parts with tight tolerances.

The SR-20R IV is designed to handle a wide range of materials, including stainless steel, aluminum, brass, copper, titanium, and plastics. This versatility makes it ideal for industries that require parts made from materials with different properties, from lightweight and corrosion-resistant metals like aluminum to tough, high-strength materials like titanium. It can also machine softer materials such as plastics, making it a flexible option for various production needs.

The SR-20R IV is optimized for machining small-to-medium-sized components, with a bar capacity of 20mm in diameter (expandable to 25mm with an optional kit). This makes it ideal for producing parts such as precision connectors, screws, fittings, and miniature gears. Its multi-axis control and ability to handle complex geometries ensure that parts are machined with high accuracy and surface finish, even for intricate designs.

The SR-20R IV significantly enhances production efficiency by offering simultaneous machining capabilities on both the main and sub-spindles, allowing for multi-tasking in a single cycle. This reduces the overall cycle time and eliminates the need for secondary operations. Its B-axis control and flexible tool setup provide greater versatility, enabling complex parts to be produced faster while maintaining high precision. This setup makes the machine ideal for high-volume production with consistent quality.

Yes, the SR-20R IV is built for continuous, high-volume production. Its 12-position tool station (expandable to 31) ensures that multiple operations can be performed in a single setup, making it an efficient choice for manufacturers looking to produce large quantities of parts without frequent tool changes. The machine’s automatic bar feeder also supports high-speed, uninterrupted production, and its robust design ensures repeatability and accuracy, even during extended runs, which is essential for industries requiring mass production with consistent precision.