Star Micronics SW-20

The Star Micronics SW-20 is a compact sliding headstock CNC automatic lathe that delivers full 20mm Swiss-type capability in a remarkably space-efficient package. The SW (compact) designation means Star has engineered this machine to maximize production capability per square foot, making it the go-to choice for shops that need 20mm Swiss-type turning but cannot dedicate the floor space required by the larger SR-20JII or SV-20R platforms.

Both spindles deliver matched 10,000 RPM performance with 2.2 kW continuous power (3.7 kW peak), ensuring identical cutting capability for front and back operations. The headstock provides 205mm stroke in standard guide bush mode (175mm with R.M.G.B.), covering the standard range of 20mm Swiss-type parts. The front tool layout includes 4 turning tools plus power-driven capability, while 2 rear turning tools with a 4-spindle sleeve holder handle cross-working from the front station.

The back 8-spindle unit is particularly capable for a compact machine, accommodating up to 8 stationary tools and 6 power-driven tools with an 8,000 RPM power-driven attachment. Cross-working power is delivered by 1.0 kW continuous motors with 3 front and 3 rear positions. C-axis control on both spindles enables milling, polygon machining, and indexed operations.

The SW-20 runs on the FANUC 31i-B5 control—the same premium platform used on Star's most advanced machines—ensuring that the compact form factor does not compromise programming sophistication. At 3,400 kg and a footprint of 2,588 x 1,300 mm, the SW-20 is about 15% smaller in footprint than the SR-20JII while delivering comparable capability. The 150-liter coolant tank and 4.8 kVA power consumption support efficient production operation. Tool shanks are available in 12mm and 16mm sizes for flexibility.