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STAR Micronics SB-20R type G

## 2021 Star SB-20R Type G – 20 mm CNC Sliding Head Lathe

7 axis | Twin spindles | Driven tooling | Guide-bush / non-guide-bush operation | FMB magazine bar feeder

Available from Swiss CNC, this 2021 Star SB-20R Type G CNC sliding head lathe combines 20 mm bar capacity, twin-spindle machining and a versatile tooling platform for precision component production. Equipped with FANUC CNC control, it offers turning, milling, drilling, tapping and back-working capability within a compact machine layout.

The 10,000 rpm main spindle and 9,000 rpm sub-spindle both feature C-axis control, supporting accurately positioned machining operations on the front and rear of the component. The fully independent sub-spindle allows front- and back-working operations to overlap where the component and programme permit, helping reduce cycle times and minimise additional handling.

### Guide-bush and non-guide-bush flexibility

A key feature of the SB-20R Type G is its ability to switch between guide-bush and non-guide-bush operation.

Guide-bush mode supports the material close to the cutting point, making it particularly suited to slender components and longer turned features. For shorter components, non-guide-bush operation can reduce bar remnant length and improve material utilisation.

This flexibility allows manufacturers to adapt the machine to different component geometries and production requirements.

### Technical specification

| Specification | Details |
|---|---|
| Manufacturer / model | Star SB-20R Type G |
| Year of manufacture | 2021 |
| Maximum machining diameter | 20 mm |
| Controlled axes | Seven: X1, Y1, Z1, C1, X2, Z2 and C2 |
| Maximum headstock stroke — guide-bush mode | 205 mm |
| Headstock stroke — non-guide-bush mode | Up to 2.5 × bar diameter, maximum 50 mm |
| Main spindle speed | Up to 10,000 rpm |
| Sub-spindle speed | Up to 9,000 rpm |
| Sub-spindle chucking capacity | 20 mm |
| Spindle positioning | C-axis control on both spindles |
| CNC control | FANUC CNC |
| Rapid traverse | Up to 35 m/min |

### Tooling capability

- Gang-type turning-tool arrangement, with six 12 mm or seven 10 mm square turning-tool positions, depending on the fitted tool block.
- Four front-working sleeve positions for end-working operations.
- Cross-drilling and milling capability, with modular cartridge tooling configurations available for different machining requirements.
- Four-position back-working station, supporting static or driven tooling according to configuration.
- Independent sub-spindle movement for component transfer and rear machining.

### Included equipment

- FMB Turbo 2-20 automatic magazine bar feeder for 3.2 m bar stock.
- Filtermist FX mist extraction system.
- LNS MH500 Turbo swarf conveyor.
- FireTrace fire suppression system.
- Selection of tooling and workholding.

The supplied bar feeder, extraction and swarf-handling equipment provide a practical package for manufacturers looking to add automated 20 mm bar-machining capacity.

### Machine hours and availability

Power-on and cutting hours to be confirmed.

2021 machines available in the UK, offered individually. Price on application, plus VAT.

Delivery, installation and training available.

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Contact Swiss CNC for pricing, machine videos, inspection arrangements and further information.