Star CNC SR-20JII Type A/B
Category: Star CNC


The SR-20JII Type B improves upon the long-serving SR-20J model, offering increased rigidity, accuracy and versatility through a combination of improved engineering and expanded functionality.

Combining a 6-tool turning platen with a 5-spindle cross drilling unit and an 8-spindle back working tool post, the SR-20JII boasts impressive tooling capacity allowing for a huge range of machining options.

The updated design features dovetail slideways for the X1, Y1, Z2 and Y2 axes improving the machine’s rigidity – ensuring stable, repeatable results even when cutting the most challenging materials.

The sub-spindle speed, power and accuracy have also been increased by adopting a built-in spindle motor offering 10,000 rpm and 3.7Kw.

The SR-20JII Type B represents the latest evolution in 20mm sliding head machining – and the most advanced technology of its type on the market.


  • Improved metal removal rates with increased power on driven tools and sub-spindle
  • Switchable between guide bush and non-guide bush modes
  • Main and sub spindle speed 10,000 rpm / power 3.7Kw
  • Reduced cycle times due to more overlapped machining possibilities
  • Improved rigidity due to dovetail guideway structure
  • Increased flexibility due to more tooling configurations
  • Improved ergonomics with large cutting room and headstock “up and over” doors
  • Increased accuracy due to built-in spindle motors




Standard Machine Specs

Max.machining diameter Standard ø 20mm (25/32in)
Max.headstock stroke Standard 205mm (8in)
R.M.G.B.unit 160mm (6-19/64in)
N.G.B.type 50mm (1-31/32in)
Tool post configuration Gang type Turning tool + 5-spindle sleeve holder
+ Power-driven tool
Number of turning tools Gang type 6 tools(□12mm)
5-spindle sleeve holder Number of tools Front : 5 tools
Rear : 5 tools
Max.drilling capability ø 12mm (1/2in)
Max.tapping capability M10 × P1.50
2-spindle front sleeve holder Number of tools 2tools
Max.drilling capability ø 10mm (25/64in)
Max.depth of hole 100mm (3-15/16in)
Power-driven att. Number of tools Gang type 3-15 tools (Option is included)
Max.drilling capability ø 10mm (25/64in)
Max.tapping capability M8×P1.25
Spindle speed Cross milling max.8,000min-1
Cartridge-type tool max.8,000min-1
Drive motor 2.2kw
Rapid feed rate 35m/min(X1,X2,Y1,Z1,Z2)
24m/min(Y2) *Type B
Main spindle indexing angle C-axis control
Main spindle speed max.10,000min-1
Main spindle motor 2.2kw(Continuous)/3.7kw(10min./25%ED)
Dimensions (W×D×H) 2,250 × 1,200 × 1,700mm
Weight 2,750kg
Power consumption 4.8KVA

Backworking Attachment

Max.chucking diameter ø 16mm(5/8in) / ø 20mm(25/32in)
Max.length for front ejection 80mm(3-5/32in) projection length 30mm(1-3/16in)
Sub spindle speed Max.8,000min-1
Sub spindle motor 1.0kw