Star CNC SV-20R
Category: Star CNC


The SV-20R combines the fast processing ability of a traditional platen type sliding head lathe with the flexibility of a turret machine. The main spindle benefits from a gang type tool post and an 8 station turret to enable simultaneous machining operations. The turret includes an independent Z3 axis, this axis allows two different features to be machined simultaneously (Z1 + Z3) using Star’s “super-position” control mode.

Fanuc’s high specification 31i-B5 control delivers full five axis capability enabling highly complex components to be processed. The B-axis tool holders on the turret enable angular features to be machined on both the main and sub-spindle.

The powerful sub-spindle with independent 8 station platen increases overlapped machining possibilities. The Y2 axis on the sub-spindle platen allows both cross working and front facing power tools to be mounted in any station.


  • Standard machining diameter 20mm (22.2mm optional)
  • Z1 Stroke of 205mm in Swiss mode (Guide Bush)
  • Z3 axis enables SUPER-POSITION control for increased overlap
  • Switchable between guide bush and non-guide bush modes
  • Main spindle speed 10,000 rpm, sub-spindle speed 10,000 rpm
  • Built-in type main and sub-spindle motors for improved indexing accuracy
  • Programmable B axis for angular machining
  • STAR MOTION CONTROL to minimize idle time
  • 8 Station sub-spindle platen for maximum overlapping




Standard Machine Specs

Max. machining diameter Ø 20 mm (25/32in)
Max. headstock stroke Standard 205 mm (8in)
R.M.G.B. type 160 mm (6-19/64in) : OP
N.G.B. type Bar diameter x 2.5 (Max. 50mm) (Max. 1-31/32in)
Tool Post Configuration Gang type Turning tool + Power-driven tool
Turret type 8 stations
Tool-Number of tools Gang type 6 tools (16mm), 7 tools (12mm)
Turret type 1 tool/station (16 mm), Max. 3 tools/station (12 mm)
Sleeve Number of tools Max. 3 tools/ station
Max. drilling capacity Ø 14 mm (35/64in)
Max. tapping capacity M10xP1.5
Power driven att. Number of tools gang type 5 tools
Number of tools turret type Max. 2 tools/ station (mountable at each 8 positions)
Max. drilling capability Ø10mm (25/64in)
Max. tapping capability M8 x P1.25
Spindle speed gang type Max. 8,000min-1
Spindle speed turret type Max. 5,750min-1
Drive motor gang type 2.2kw
Drive motor turret type 2.7kw (continuous)/ 4.0kw (5min./30%ED)
Rapid feed rate 30mm/min (X1,X2,X3,Y1,Z1,Z2,Z3)
20mm/min (Y2), 15mm/min(Y3)
Main spindle indexing angle C-axis control
Main spindle speed Max. 10,000min-1
Main spindle motor 3.7kw (continuous)/ 5.5kw (10min./60%ED)
Coolant tank capability 220l
Dimension (W x D x H) 2,730 x 1,350 x 1,865 mm
Center height 1,125mm
Weight 4,150kg
Power Consumption 6.3KVA

Backworking Attachment

Max. chucking diameter Ø 20 mm (25/32in)
Max. length for front ejection 105 mm (4-9/64in)
Max. parts projection length 75 mm (2-61/64in)
Back 8-Spindle unit Number of tools stationary 8 tools
Number of tools power driven Max. 8 tools
Max. drilling capability stationary Ø12mm (1/2in)
Max. drilling capability power driven Ø6mm (15/64in)
Max. tapping capability power driven M10 x P1.5
Max. tapping capability power driven M5 x P0.8
Power-driven att. spindle speed Max. 8,000min-1
Power-driven att. drive motor 1.0kw (continuous) /1.2kw (5min/30%ED)
Sub spindle indexing angle C-axis control
Sub spindle speed Max. 10,000min-1
Sub spindle speed control AC spindle drive
Sub spindle motor 2.2kw (continuous) /3.7kw (10min/25%ED)