Star SV-20

$280,000 - $450,000 Updated 2025-03-15

Key Specifications

Max Spindle

10,000 min-1

Spindle Taper

0.01° (C-axis control)

Tool Capacity

4 tools (16mm) : OP 5 tools (12mm) : OP

Rapid Traverse

36 m/min

Spindle Power

3.7kw (continuous) / 5.5kw (30min.)

Max Turn Length

Standard 205mm (8in) 195mm (7-11/16in)

Overview

The Star SV-20 is Star Micronics' high-performance Swiss-type CNC automatic lathe for the 20mm bar capacity class, representing the pinnacle of Star's Swiss-type technology in the most popular bar size segment. The SV (Standard Value-plus / High-Performance) designation signifies a machine built for the most demanding applications where maximum precision, fastest cycle times, and highest spindle performance are required. The SV-20 is the machine shops choose when the SR-20J's capability isn't enough.

The SV-20 features a high-speed main spindle reaching 12,000 RPM and a back spindle at 10,000 RPM—significantly faster than the SR-20J's 10,000/8,000 RPM combination. This speed advantage translates directly to better surface finishes, longer tool life through optimal cutting conditions, and faster cycle times on finishing operations. With up to 10 axes including B-axis capability on select configurations, the SV-20 can perform angular drilling and milling operations that would otherwise require secondary operations on dedicated equipment.

The SV-20's tool system accommodates up to 32 tool positions including extensive live tooling with speeds reaching 10,000 RPM, enabling aggressive milling and drilling operations at speeds competitive with dedicated machining centers. The Y-axis provides full off-center machining capability, and the dual Y-axis option enables complex features on both the front and back spindle sides. Star's Motion Control System (MCS) is optimized on the SV platform for maximum performance, delivering the fastest possible cycle times through intelligent multi-path coordination.

Star's hydraulic-free design provides vibration-free operation that is critical at the precision level the SV-20 targets. The all-electric design, combined with advanced thermal management, delivers dimensional stability that maintains tight tolerances through extended production runs. The machine supports both guide bushing and non-guide bushing configurations, and the Fanuc 31i-B5 control provides the processing power needed for the most complex synchronized multi-axis programs.

Full Specifications

Parameter	Value
Max Bar Capacity	20 mm (0.787 in)
Max Machining Diameter	20 mm (0.787 in)
Max Machining Length	205 mm (8.07 in)
Main Spindle Speed	12,000 RPM
Back Spindle Speed	10,000 RPM
Live Tool Speed	10,000 RPM
Number Of Axes	Up to 10 (including Y1, Y2, B-axis, C1, C2)
Tool Positions	32 (including live tools)
Y Axis Stroke	±15 mm
B Axis	Available on select configurations
Guide Bushing	Yes (guide bushing and NGB available)
CNC Control	Fanuc 31i-B5
Rapid Traverse Rate	36 m/min
Machine Weight	3,400kg
Power Consumption	12 kVA
Max Turning Diameter	ø20mm (25/32in)
Max Turning Length	Standard 205mm (8in) 195mm (7-11/16in)
Max Spindle Speed	10,000 min-1
Spindle Motor Power	3.7kw (continuous) / 5.5kw (30min.)
Spindle Taper	0.01° (C-axis control)
Turret Stations	8 face
Tool Capacity	4 tools (16mm) : OP 5 tools (12mm) : OP
Coolant Capacity	170ℓ
Floor Space	2,670 x 1,375 x 1,660mm (including leveling pads)
Electrical	9.0KVA

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 the most complex implants, including spinal screws with hexalobular features and compound-angle holes Aerospace shops machining precision components with angular features that would otherwise require secondary operations Shops replacing multi-operation processes with single-setup Swiss machining to reduce handling and improve quality High-precision contract manufacturers competing for the most complex Swiss-type work in the 20mm class Defense and space industry suppliers where maximum precision and surface finish are non-negotiable requirements Shops that have outgrown the SR-20J's capability on their most demanding parts

Frequently Asked Questions

01 What does a Star SV-20 cost?

A new Star SV-20 ranges from approximately $280,000 for a standard configuration to $450,000 for a fully equipped 10-axis model with B-axis and maximum tooling. Used SV-20 machines are less common than SR-20J machines and typically sell for $100,000-$250,000 depending on configuration and condition.

02 What is the difference between the SR-20J and SV-20?

The SV-20 is Star's premium 20mm platform with higher spindle speeds (12,000 vs 10,000 RPM main), more tool positions (32 vs 27), B-axis option, faster rapids (36 vs 32 m/min), and up to 10 axes vs the SR-20J's 9. The SR-20J is the better value for most 20mm Swiss work, while the SV-20 is justified for the most demanding applications.

03 When do I need a B-axis on a Swiss lathe?

A B-axis is needed when parts have holes, slots, or milled features at compound angles that can't be reached by the standard X-Y-Z axes. Common applications include angled cross-holes on medical implants, compound-angle ports on hydraulic fittings, and angular features on aerospace connectors. If your current process requires a secondary operation for angular features, a B-axis Swiss lathe can consolidate operations.

04 How does the SV-20 compare to the Citizen L20 XII?

Both are top-tier 20mm Swiss platforms. The SV-20 offers higher main spindle speed (12,000 vs 10,000 RPM) and Star's hydraulic-free design. The Citizen L20 XII offers LFV chip-breaking and up to 36 tool positions. For finishing-critical work, the SV-20's speed advantage is compelling. For gummy materials requiring chip control, the Citizen's LFV is a significant advantage.

05 Is the SV-20 worth the premium over the SR-20J?

Only if your applications genuinely benefit from the enhanced capability. If you regularly produce parts with angular features (B-axis), need the best possible surface finish (higher RPM), or consistently max out the SR-20J's tooling (32 vs 27 positions), the SV-20 is justified. For typical 20mm Swiss work, the SR-20J remains the better value.