Star Micronics SA-20R Multi-Spindle Automatic

$600,000 – $1,050,000 Updated 2026-03-17

Key Specifications

Number of Spindles

Max Bar Diameter

20 mm

Max Spindle Speed

7,500 rpm

Spindle Motor Power

18 kW (total installed)

Bar Feed Capacity

Front-loaded magazine bar feeder compatible

Cross Slides

6 cross slides (one per position) + end-working unit

Overview

The Star Micronics SA-20R is a CNC multi-spindle automatic bar machine for high-volume production of precision turned components up to 20mm bar diameter. Developed by Star Micronics — the Hamamatsu, Japan-based manufacturer renowned for its Swiss-type CNC automatics — the SA-20R multi-spindle brings the company's precision machining philosophy to the multi-spindle format, targeting connector manufacturers, medical device producers, automotive Tier 1 suppliers, and other high-volume precision component shops that require simultaneous multi-position cutting at 20mm bar capacity.

The SA-20R features a 6-spindle rotating drum with independently CNC-controlled cross slides at each position. Unlike traditional cam-driven multi-spindles, the SA-20R uses fully servo-driven axes, enabling job changeovers to be accomplished by loading new CNC programs and repositioning tooling — without the mechanical cam changes that define legacy multi-spindle changeover. Star's FANUC-based CNC control manages synchronization across all spindle positions and provides operators with the familiar FANUC programming environment that is widely supported by CAM software and in-house programming teams.

The machine's rigid cast iron construction and precision spindle bearings deliver the dimensional consistency across high-volume runs that precision component manufacturers require. Integrated high-pressure coolant and precision chip management systems maintain stable cutting conditions during extended production cycles. Star's bar feed interface is compatible with standard magazine bar feeders, enabling fully automated input for lights-out operation.

The SA-20R multi-spindle is designed for applications where the throughput advantage of simultaneous multi-position cutting justifies the capital investment: high-volume connector body machining, miniature valve components, automotive small-bore turned parts, and precision hardware. It competes with Tornos Sigma 20, Index MS22-6, and Schutte 20mm CNC multi-spindles in the global market for precision multi-spindle capacity at the 20mm bar size.

Full Specifications

Parameter	Value
Number Of Spindles	6
Max Bar Diameter	20 mm
Max Spindle Speed	7,500 rpm
Spindle Motor Power	18 kW (total installed)
Bar Feed Capacity	Front-loaded magazine bar feeder compatible
Cross Slides	6 cross slides (one per position) + end-working unit
Control System	FANUC CNC (Star Micronics multi-spindle configuration)
Machine Weight	Approx. 11,500 kg

Strengths & Limitations

Strengths

FANUC CNC control enables familiar programming environment and broad CAM software compatibility
Servo-driven axes allow job changes without mechanical cam changeover — faster transitions than legacy multi-spindles
Star Micronics' precision heritage and global support network provide strong aftermarket backing
6-spindle simultaneous cutting achieves seconds-per-part cycle time for sustained high-volume production
Compatible with standard magazine bar feeders for fully automated, unattended operation

Limitations

High capital investment requires volume justification relative to Swiss-type single-spindle alternatives
FANUC multi-spindle configuration is specialized — not all FANUC-trained programmers are familiar with multi-spindle synchronization
20mm maximum bar capacity limits application to smaller-diameter part families
Requires skilled multi-spindle setup technicians for initial tooling and program development

Best For

High-volume connector and miniature valve component manufacturers in the sub-20mm diameter range Automotive Tier 1 suppliers producing fuel system hardware, ABS components, and transmission small parts at volume Medical device manufacturers requiring sustained production of bone screws, fasteners, and small implant components Precision hardware and fastener producers leveraging simultaneous multi-position cutting for maximum output

Frequently Asked Questions

01 What is the difference between the Star SA-20R multi-spindle and the Star SA-20R Swiss-type lathe?

The Star SA-20R Swiss-type lathe is a single-spindle sliding headstock automatic for complex precision parts with full Y-axis and B-axis capability. The SA-20R multi-spindle is an entirely different machine class: a 6-spindle drum machine where all positions cut simultaneously for maximum volume on simpler, multi-feature parts. The two machines share a similar naming convention but serve different production requirements.

02 Why does the SA-20R multi-spindle use a FANUC control instead of a proprietary Star control?

Star Micronics uses FANUC CNC on the SA-20R multi-spindle to provide operators and programmers with a widely supported, familiar control environment. FANUC's presence in precision machining means CAM post processors, programming training, and service resources are broadly available — reducing the learning curve and support overhead compared to a proprietary multi-spindle control.

03 How does the SA-20R multi-spindle compare to the Tornos Sigma 20 multi-spindle?

Both machines are 6-spindle CNC multi-spindle automatics for 20mm bar. The Tornos Sigma 20 uses Tornos's proprietary C-More control, while the Star SA-20R uses FANUC. The Tornos platform has a stronger presence in European precision machining; Star Micronics has a broader installed base in Asian markets and North American shops with existing Star Swiss-type infrastructure. Both are competitive on performance metrics.