Star CNC SR-20J Type C
Category: Star CNC


The SR-20J type C sliding head lathe is ideal for small length-to-diameter ratio parts. Production costs for short-turned parts are further reduced through the lack of a revolving guide bush, therefore greatly reducing remnant lengths.

A total of up to 30 cutting tools are still available including 14 power-driven tools for cross drilling, milling, slotting and angular hole machining. The new 2 position deep drilling station allows drilled holes up to 10mm diameter by 100mm deep to be carried out on the main spindle.

The fully independent sub spindle has a full C axis and coupled with polar co-ordinates creates a virtual ‘Y’ axis thus enabling the machining of hexagon, square or other profiles.


  • Full 20mm Bar capacity in both Main and Sub spindles
  • Six Turning Tools
  • 6 Front End working tools
  • 4 Independent Rear end working tools (8 static or 6 driven)
  • 5 Driven tools as standard (up to a maximum of 14)
  • ‘C’ Axis standard on Main spindle and Sub spindle
  • Maintenance free Linear Guideways
  • Fully independent Sub-spindle
  • 35 mpm Rapid Traverse
  • Independent deep hole drilling Spindles – Main spindle
  • Shorter Remnant Length




Standard Machine Specs

CNC control unit Fanuc 18i-TB
Number of axes 7
Max. machining diameter Ø 20 mm (23 mm option)
Max. headstock stroke 205 mm standard
172 mm rotary flexibe guide bush
Max. main spindle speed 10'000 rpm
Main spindle indexing C-axis (0.01°)
Main spindle motor 2.2 kw / 3.7 kw
Number of tool stations Gang tool post 6 turning tools
4 power-driven tool stations
4-Spindle sleeve holder 4 tools frontworking
4 tools backworking (interpolation possible)
Max. drilling capacity Ø 10 mm 4-spindle sleeve holder
Ø 8 mm power-driven attachment
Max. tapping capacity M8 x 1.25 4-spindle sleeve holder
M6 x 1.0 power-driven attachment
Max. milling capacity Ø 10 mm
Coolant tank capacity 170 L
Dimension (W x D x H) 2200 x 1200 x 1700 mm
Weight 2200 kg

Backworking Attachment

Max. chucking diameter Ø 20 mm
Max. pick-up part length 80 mm
Max. part protection length 30 mm
Max. sub spindle speed 8'000 rpm
Sub spindle motor 1.5 kw / 2.2 kw
Number of tool stations 4 stationary or power-driven tools
Max. drilling capacity Ø 8 mm stationary tools
Ø 5 mm power-driven tools
Max. tapping capacity M8 x 1.25 stationary tools
M4 x 0.7 power-driven tools
Max. feed rate all axes 35 m/min