Star SR-32J / SR-32JN

The Star SR-32J and SR-32JN are Star Micronics' standard-range Swiss-type CNC automatic lathes for the critical 32mm bar capacity class, with the SR-32J configured for guide bushing operation and the SR-32JN designed for non-guide bushing (NGB) operation. Together they provide comprehensive coverage of the 32mm Swiss market, enabling shops to choose the optimal configuration based on part geometry, tolerance requirements, and material utilization priorities.

The SR-32J/JN features a main spindle reaching 8,000 RPM and a back spindle at 8,000 RPM, with up to 10 axes including Y1 and Y2 capability for off-center machining on both front and back spindles. This dual Y-axis capability is particularly valuable at the 32mm bar size where parts tend to be more complex, with multiple milled features, flats, hexagons, and angular holes on both ends. Up to 30 tool positions including extensive live tooling provide the tooling density needed for even the most feature-rich 32mm Swiss parts.

Star's hydraulic-free design is especially valuable on the larger SR-32J/JN where hydraulic systems would generate more heat and require more maintenance. The all-electric design keeps thermal distortion to a minimum and eliminates the maintenance burden of hydraulic oil, filters, and pumps. Star's Motion Control System coordinates the multi-axis operations efficiently, and the Fanuc 31i-B5 control handles the complex synchronized programs with proven reliability.

The SR-32JN non-guide bushing variant is particularly noteworthy. At the 32mm bar size, guide bushing operation produces longer bar remnants that represent significant material waste, especially with expensive aerospace alloys and medical-grade materials. The NGB configuration eliminates this waste while still delivering excellent precision for parts with lower length-to-diameter ratios. Many shops run both the SR-32J and SR-32JN to optimize for different part families.