Star SR-38J

$300,000 - $480,000 Updated 2025-03-15

Key Specifications

Max Spindle

7,000min-1

Tool Capacity

5 tools on the front + 2 tools on the rear + 3 tools on the front : OP

Rapid Traverse

36m/min(X1, Y1, Z1, X2, Z2)

Spindle Power

7.5kW (continuous) / 11kW (10min./25%ED)

Max Turn Length

320mm (12-19/32in)

max bar capacity

38 mm (1.50 in)

Overview

The Star SR-38J is Star Micronics' standard-range Swiss-type CNC automatic lathe for the 38mm bar capacity class, representing one of the largest Swiss-type machines in Star's lineup. The 38mm bar capacity opens up applications that are too large for the more common 20mm and 32mm Swiss platforms, including larger orthopedic implants, aerospace fittings, hydraulic components, and automotive powertrain parts. The SR-38J brings Star's proven precision, hydraulic-free design, and Motion Control System to this larger format.

The SR-38J features a main spindle reaching 7,000 RPM and a back spindle at 6,000 RPM, with built-in motor designs optimized for the torque demands of larger-diameter bar stock. While the spindle speeds are lower than Star's 20mm platforms due to the larger bar mass, the available torque is substantially higher to handle the heavier cuts required at this bar size. With up to 10 axes including Y-axis capability and up to 30 tool positions with extensive live tooling, the SR-38J delivers multi-tasking capability that eliminates secondary operations on complex large-diameter Swiss parts.

At the 38mm bar size, Swiss-type machining enters territory where the choice between Swiss-type and conventional CNC turning becomes more nuanced. The SR-38J's guide bushing technology provides superior concentricity and surface finish on longer parts where conventional lathes would struggle with deflection, while the back spindle and live tooling enable complete part machining that would otherwise require multiple setups. For parts with length-to-diameter ratios greater than 3:1, the Swiss-type approach delivers measurable quality advantages.

Star's hydraulic-free design is especially impactful on the SR-38J where the forces involved in 38mm bar clamping traditionally require substantial hydraulic systems. The all-electric design eliminates this maintenance burden while providing precise, repeatable clamping force. The Fanuc 31i-B5 control handles the multi-axis coordination, and Star's proven programming environment simplifies the creation of complex synchronized programs for this larger-format Swiss machine.

Full Specifications

Parameter	Value
Max Bar Capacity	38 mm (1.50 in)
Max Machining Diameter	38 mm (1.50 in)
Max Machining Length	380 mm (14.96 in)
Main Spindle Speed	7,000 RPM
Back Spindle Speed	6,000 RPM
Live Tool Speed	6,000 RPM
Number Of Axes	Up to 10 (including Y1, Y2, C1, C2)
Tool Positions	30 (including live tools)
Y Axis Stroke	±20 mm
Guide Bushing	Yes (guide bushing and NGB available)
CNC Control	Fanuc 31i-B5
Rapid Traverse Rate	36m/min(X1, Y1, Z1, X2, Z2)
Machine Weight	4,250kg
Power Consumption	15 kVA
Max Turning Diameter	Ø38mm (1-1/2in)
Max Turning Diameter Non Guide Bush	Ø42mm (1-21/32in)
Max Turning Length	320mm (12-19/32in)
Max Spindle Speed	7,000min-1
Spindle Motor Power	7.5kW (continuous) / 11kW (10min./25%ED)
Tool Capacity	5 tools on the front + 2 tools on the rear + 3 tools on the front : OP
Coolant Capacity	253ℓ (359ℓ : OP)
Floor Space	2,740 x 1,315 x 2,120mm
Cnc Control	Fanuc 0i-TF
Electrical	12.8 kVA

Specifications sourced from starcnc.com — verified 2026-03-28

Strengths & Limitations

Strengths

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Limitations

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Best For

Medical device manufacturers producing larger orthopedic implants, hip and knee components, and spinal rod systems in the 25-38mm range Aerospace shops machining precision hydraulic fittings, actuator shafts, and structural fasteners requiring Swiss-level concentricity Automotive manufacturers producing fuel rail components, transmission shafts, and powertrain parts that benefit from Swiss-type precision Shops replacing older multi-spindle machines running larger-diameter work with modern CNC Swiss capability Hydraulic component manufacturers producing valve bodies, spool components, and precision fittings

Frequently Asked Questions

01 What does a Star SR-38J cost?

A new Star SR-38J ranges from approximately $300,000 to $480,000 depending on configuration and options. With bar feeder, chip conveyor, and initial tooling, the total investment typically runs $400,000-$600,000. Used SR-38 models are less common than 20mm and 32mm machines but can be found for $100,000-$250,000.

02 When should I choose a 38mm Swiss over a conventional CNC lathe?

Choose the SR-38J when your parts have length-to-diameter ratios greater than 3:1, require concentricity tighter than 0.010mm, need complete machining (both ends) in a single setup, or involve high volumes where the Swiss-type bar feed and back spindle capability provide cycle time advantages over conventional chuck work.

03 How does the SR-38J compare to the SV-38R?

The SV-38R is Star's high-performance 38mm platform with more power, higher rigidity, and maximum capability for the most demanding 38mm applications. The SR-38J offers excellent capability at a lower price point. Choose the SV-38R for the most complex, tolerance-critical work and the SR-38J for strong 38mm capability at better value.

04 What bar feeders work with 38mm Swiss lathes?

The SR-38J requires a bar feeder rated for 38mm+ bar stock. Major suppliers like LNS, FMB, and IEMCA offer suitable magazine and hydrodynamic bar feeders. The larger bar size means the feeder is physically larger than 20mm models, impacting the total cell footprint.

05 Can the SR-38J run without a guide bushing?

Yes. The SR-38J supports non-guide bushing operation, which is particularly valuable at the 38mm bar size where guide bushing remnants waste significant material. NGB mode is preferred for shorter parts with low length-to-diameter ratios, while guide bushing mode is essential for longer, tighter-tolerance parts.