Star CNC Machine Tool
SR-20R IV Type A & B
by Star CNC Machine Tool
The SR-20R IV Type A & B CNC Swiss Lathe is designed for high-precision, high-speed machining, perfect for producing intricate small parts.
ø20mm (25/32 in)
Max. Machining Diameter
205 mm (8 in)
Max. Headstock Stroke
20 mm (expandable to 25 mm)
Bar Capacity


SR-20R IV Type A & B Features
Standard features that set this machine apart in demanding manufacturing environments.
Precision & Performance
- Spindle speeds up to 10,000 RPM
- Multi-axis control with simultaneous machining on the main and sub-spindle
- 4-Spindle Sleeve Holder
- 2-Spindle Front Sleeve Holder
- Power Driven Attachment
- Rapid Feed Rate
- Main Spindle Indexing Angle
- Main Spindle Speed
- Main Spindle Motor
Built-In Extras
- Capable of handling up to 41 tool positions for maximum flexibility
- Max. Machining Diameter
- Max. Headstock Stroke
- Tool
- Dimensions (W x D x H)
- Coolant Tank Capability
Star CNC SR-20R IV Type A & B Technical Details
Complete specifications, standard features, and optional upgrades.
- Max. Machining Diameter
- ø20mm (25/32 in)
- Max. Headstock Stroke
- 205 mm (8 in)
- Bar Capacity
- 20 mm (expandable to 25 mm)
- Main Spindle Speed
- max. 10,000 RPM
- Main Spindle Motor
- 2.2 kW (continuous) / 3.7 kW (10min/25%ED)
- Main Spindle Indexing
- C-axis control
- Axis Configuration
- 8-axis
- Tool Stations
- 27-position (expandable to 41)
- B-axis Control
- Yes (Type A & B)
- Rapid Feed Rate (X1, X2, Y1, Z1, Z2)
- 35 m/min
| Max. Machining Diameter | ø20mm (25/32 in) |
| Max. Headstock Stroke | 205 mm (8 in) |
| Bar Capacity | 20 mm (expandable to 25 mm) |
| Main Spindle Speed | max. 10,000 RPM |
| Main Spindle Motor | 2.2 kW (continuous) / 3.7 kW (10min/25%ED) |
| Main Spindle Indexing | C-axis control |
| Axis Configuration | 8-axis |
| Tool Stations | 27-position (expandable to 41) |
| B-axis Control | Yes (Type A & B) |
| Rapid Feed Rate (X1, X2, Y1, Z1, Z2) | 35 m/min |
SR-20R IV Type A & B Questions
Answers to common questions about the SR-20R IV Type A & B.
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.
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