Star Micronics SR-10J
Key Specifications
max machining diameter
max headstock stroke standard
max headstock stroke rmgb
main spindle speed
main spindle power
sub spindle speed
Overview
The Star Micronics SR-10J is a standard-class sliding headstock CNC automatic lathe purpose-built for high-precision machining of components up to 10mm diameter. The SR designation places it in Star's standard lineup—above the entry-level SL and basic SB series—delivering the tool capacity, axis control, and programming flexibility that complex small-part production demands. The Type C variant (the current production model) represents the latest refinement of this proven platform.
The main spindle reaches 15,000 RPM with 2.2 kW continuous power (3.7 kW peak at 60% ED), providing excellent surface speeds for small-diameter work across all common materials. The sub spindle runs at 10,000 RPM with 0.55 kW continuous power for back-working operations. The 4-spindle sleeve holder with front and rear tool stations, combined with the back 4-spindle unit, provides a comprehensive tooling layout for completing complex parts in a single cycle. C-axis control with clamping is available on both main and sub spindles for indexed positioning operations.
The SR-10J runs on the FANUC 32i-B control—Star's preferred control platform for standard and premium machines—providing advanced multi-path programming, high-speed processing, and the kind of interpolation capability that complex small parts with off-center features require. Multiple guide bush configurations are available including standard (135mm stroke) and revolving magic guide bush (105mm stroke) for flexible operation.
At 1,400 kg and a compact 1,865 x 775 mm footprint, the SR-10J is remarkably small for a machine of its capability. The 89-liter coolant tank is sized for the machine's application range, and power consumption of just 3.1 kVA makes it one of the most energy-efficient Swiss lathes available. This machine excels in medical, electronics, and watch component production where extreme precision on small parts is non-negotiable.
Full Specifications
| Parameter | Value |
|---|---|
| Max Machining Diameter | 10 mm (25/64 in) |
| Max Headstock Stroke Standard | 135 mm (5-5/16 in) |
| Max Headstock Stroke Rmgb | 105 mm (4-9/64 in) |
| Main Spindle Speed | 15,000 RPM |
| Main Spindle Power | 2.2 kW continuous / 3.7 kW (15 min, 60% ED) |
| Sub Spindle Speed | 10,000 RPM |
| Sub Spindle Power | 0.55 kW continuous / 1.1 kW (15 min, 50% ED) |
| Tool Stations | 6 tools (8 mm shank) |
| Sleeve Holder | 4-spindle (front 4 / rear 4 tools) |
| Back Unit | 4-spindle |
| C Axis | Main and sub spindle (with clamp) |
| Rapid Feed Rate | 35 m/min |
| CNC Control | FANUC 32i-B |
| Power Consumption | 3.1 kVA |
| Coolant Tank | 89 L |
| Machine Weight | 1,400 kg (3,086 lb) |
| Dimensions | 1,865 x 775 x 1,695 mm |
Specifications sourced from starcnc.com — verified 2026-03-28
Strengths & Limitations
Strengths
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Limitations
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Best For
Frequently Asked Questions
01
A new Star SR-10J Type C typically costs $80,000-$130,000 depending on tooling configuration and options. This positions it competitively against other premium 10mm Swiss lathes from Citizen and Tsugami. Used SR-10J machines in good condition trade in the $40,000-$70,000 range.
02
Both handle 10mm bar stock, but they serve different purposes. The SL-10 has a faster spindle (18,000 vs 15,000 RPM) and lower price, making it ideal for straightforward small parts. The SR-10J offers more advanced control (same 32i-B), C-axis clamping, and a tooling layout optimized for more complex parts. Choose the SR-10J when part complexity justifies the premium over the SL-10.
03
The revolving magic guide bush (R.M.G.B.) allows switching between guide bush and non-guide bush operation without physically changing the guide bushing. This reduces setup time, minimizes bar remnant waste on shorter parts, and provides flexibility to handle diverse part geometries on the same machine. The R.M.G.B. configuration reduces headstock stroke from 135mm to 105mm.
04
Yes. With C-axis control (with clamping) on both spindles and power-driven tool capability, the SR-10J performs cross-drilling, cross-milling, hexagonal and square milling, and polygon machining on small parts. The sleeve holder's front and rear positions accommodate multiple cross-working tools for completing features in a single cycle.
05
The Type C is the current production variant of the SR-10J, representing the latest refinements to this platform. Type designations in Star's nomenclature indicate generation and configuration variants. The Type C features the latest Fanuc 32i-B control integration, updated mechanical refinements, and current-generation servo and spindle drive technology.
Videos
Star Micronics GB
Cosmos Group - CNC Machine Tool Solutions
StarCNCMachineToolCo
Star Micronics GB
metalmachinery
Community Discussions
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Pricing and buying discussion — Around 4 k usd , no tooling or vise worth it? Dro doesn't workMore new machines coming in! : r/Machinists - RedditDro not working?? : r/machining - RedditLine boring questions : r/Machinists - RedditCheap tenths DRO for a surface grinder? : r/Machinists - RedditStar s
Community discussion — More new machines coming in! : r/Machinists - Reddit
Pricing and buying discussion — Dro not working?? : r/machining - RedditLine boring questions : r/Machinists - RedditCheap tenths DRO for a surface grinder? : r/Machinists - RedditStar spindle orientation help : r/Machinists - Reddit
Pricing and buying discussion — Line boring questions : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
