Star SR20 RIV Type B - 2016

Used Star SR20 RIV Type B 2016 CNC Sliding Head lathe

FMB 3-36 Magazine Bar Feeder inc smaller channel set

UB20-2000 High Pressure Coolant System (2000 Psi/12 Outlets)

LNS MH500 Swarf Conveyor (Low Discharge Style)

Long Parts Ejection

FireTrace Suppression

Running Hours - 29, 237

Selection of Driven & Static Tool Holders

This is a rare opportunity to purchase one of the best high end 20mm CNC sliding head lathes. Machine can be seen running in the Midlands area.

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2016 Star SR-20RIV Type B – High-Precision Swiss-Type Sliding Head Lathe

The Star SR-20RIV Type B represents one of the most refined iterations of Star’s proven SR series — designed to deliver exceptional accuracy, flexibility, and reliability in small-diameter, complex component manufacturing. Released as part of the SR-20RIV generation, this model combines Star’s advanced control system, modular tooling configuration, and versatile machining capability in both guide bush and non-guide bush modes.

Machine Overview

The SR-20RIV Type B is a 20mm capacity sliding head lathe engineered for demanding applications across the aerospace, medical, automotive, and precision engineering sectors. Its Type B configuration enhances driven tooling capacity and improves chip control and productivity on multi-process operations.

This 2016 model benefits from Star’s Fanuc 31i-B CNC control system, offering intuitive programming, improved processing speed, and advanced synchronisation across main and sub-spindle operations. With simultaneous 8-axis machining, the SR-20RIV Type B allows complete machining of complex parts in a single setup — reducing cycle times and ensuring consistent dimensional accuracy.

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Technical Specifications

Specification Details

Maximum Machining Diameter 20mm

Maximum Z-Axis Travel (Guide Bush Mode) 205mm

Main Spindle Speed 10,000 rpm

Sub Spindle Speed 10,000 rpm

Number of Controlled Axes 8 (X1, Y1, Z1, C1, X2, Z2, C2, B)

Main Spindle Motor Power 3.7 / 7.5 kW

Sub Spindle Motor Power 1.5 / 2.2 kW

Number of Tool Stations Up to 41

Driven Tool Speed 10,000 rpm (front and rear positions)

Guide Bush System Convertible – guide bush / non-guide bush operation

CNC Control Fanuc 31i-B

Coolant Tank Capacity 180 litres

Machine Weight (approx.) 3,000 kg

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Key Features and Advantages

1. Convertible Guide Bush System

One of the standout features of the SR-20RIV Type B is the ability to operate with or without a guide bush, offering flexibility for different production runs.

• With guide bush: Ideal for long, slender parts requiring high rigidity.

• Without guide bush: Perfect for shorter components, reducing bar wastage and setup time.

This adaptability makes the SR-20RIV an excellent choice for subcontractors handling varied work.

2. Enhanced Driven Tool Capability

The Type B version provides additional driven tooling stations and an optimized tool layout for simultaneous machining on both main and sub spindles. This configuration allows for efficient cross drilling, milling, and end-face machining — all within compact cycle times.

3. High-Speed, High-Accuracy Performance

Equipped with precision spindle bearings, Star’s renowned thermal stability design, and a powerful control system, the SR-20RIV maintains micron-level accuracy even during extended production. Combined with C-axis indexing on both spindles, it supports full contouring and complex part geometries.

4. Compact and Accessible Design

Despite its capability, the SR-20RIV Type B maintains a compact footprint, ensuring easy access for setup, tool changes, and maintenance. The machine’s ergonomic layout enhances productivity on the shop floor.

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Applications

The 2016 Star SR-20RIV Type B is particularly suited to:

• Medical components (bone screws, dental implants, surgical instruments)

• Aerospace fasteners and precision fittings

• Automotive sensor housings and connectors

• High-precision instrumentation and electronics parts

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Summary

The 2016 Star SR-20RIV Type B remains one of the most versatile and proven Swiss-type sliding head lathes on the market. Combining high-speed machining, flexible tooling, and guide bush convertibility, it continues to deliver top-tier performance for precision part manufacturers.

Whether you’re upgrading from earlier SR models or expanding your capacity with a reliable, multi-axis sliding head machine, this SR-20RIV Type B offers outstanding value and capability in today’s subcontracting environment.