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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.
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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.

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