Star Micronics SA-20R Type B

The Star Micronics SA-20R Type B is a 5-axis Swiss-type automatic lathe with B-axis angular machining capability for bar stock up to 20mm, representing Star's approach to bringing compound-angle machining to the 20mm Swiss platform. The 'R' in the designation signifies the right-hand tool arrangement, and 'Type B' indicates the B-axis configuration—a programmable rotary axis that tilts the tool spindle to any angle within its range, enabling compound-angle drilling, angular milling, and true 5-axis contouring on Swiss-type parts without secondary operations.

The B-axis capability on the SA-20R Type B addresses a specific application gap in conventional Swiss-type machining: features that require compound angles or canted surfaces that cannot be produced by the standard radial and axial tool orientations of a non-B-axis Swiss platform. In medical device manufacturing, bone screw cross-holes at oblique angles, instrument components with angled bores, and implant features requiring true 5-axis surface generation are the typical applications that justify B-axis specification. In aerospace precision, angled fuel system fittings, sensor housing bores at compound angles, and miniature actuator components with angular features are the primary B-axis applications.

Star's SA series represents the brand's production-focused 20mm Swiss line, positioned as a high-throughput platform with a comprehensive tooling complement. The SA-20R Type B adds B-axis angular machining to the SA series production architecture, making it the most capable member of the 20mm SA family for complex, feature-rich parts. The FANUC 32i control manages the full 5-axis simultaneous operation including B-axis coordination with the primary turning axes—an important differentiator in the 5-axis Swiss market where control sophistication directly affects the quality and flexibility of compound-angle machining.

Star's LFV (Low Frequency Vibration) chip-breaking technology, developed by Star in parallel with Citizen's similar system, is available on the SA-20R Type B for chip control in difficult-to-machine materials. Star's version of LFV operates on the same principle—controlled oscillatory tool motion that mechanically breaks chips—and provides equivalent capability for lights-out production in stainless steel, titanium, and other chip-problematic materials common in medical and aerospace applications.