Star CNC Swiss Type Automatic Lathe

Ever-Evolving SR-20JII with versatile features to respond to varied needs.

• A unique slanted dovetail slideway structure for insreased rigidity of the tool post.
• Type A is equipped with a 4-spindle type and Type B is equipped with Y-axis control / 8-spindle type backworking tool post.
• The guide bush and non-guide bush are interchangeable. The non-guide bush type incorporates a spindle sleeve slide guideway structure for higher spindle rigidity.



Tool PostTooling 
5-Spindle cross
drilling unit
Turning tool6 tools
Frong-end working tool7 tools
Rear-end working tool5 tools
Power-driven tool(ER16)3 tools
Cartridge type2 pos.
5軸型 ER16/20
Turning tool6 tools
Frong-end working tool7 tools
Rear-end working tool5 tools
Power-driven tool(ER20)1 tools
Power-driven tool(ER16)2 tools
Cartridge type2 pos.
*Type B
Rear-end working tool8 tools
Stationary toolmax.8 tools
Power-driven toolmax.8 tools
*Type A
Rear-end working tool4 tools
Stationary toolmax.4 tools
Power-driven toolmax.4 tools


Max.machining diameterStandardø 20mm (25/32in)
Max.headstock strokeStandard205mm (8in)
R.M.G.B.unit160mm (6-19/64in)
N.G.B.type50mm (1-31/32in)
Tool post configurationGang typeTurning tool + 5-spindle sleeve holder
+ Power-driven tool
Number of turning toolsGang type6 tools(□12mm)
5-spindle sleeve holderNumber of toolsFront : 5 tools
Rear : 5 tools
Max.drilling capabilityø 12mm (1/2in)
Max.tapping capabilityM10 × P1.50
2-spindle front sleeve holderNumber of tools2tools
Max.drilling capabilityø 10mm (25/64in)
Max.depth of hole100mm (3-15/16in)
Power-driven att.Number of toolsGang type3-15 tools (Option is included)
Max.drilling capabilityø 10mm (25/64in)
Max.tapping capabilityM8×P1.25
Spindle speedCross millingmax.8,000min-1
Cartridge-type toolmax.8,000min-1
Drive motor2.2kw
Rapid feed rate35m/min(X1,X2,Y1,Z1,Z2)
24m/min(Y2) *Type B
Main spindle indexing angleC-axis control
Main spindle speedmax.10,000min-1
Main spindle motor2.2kw(Continuous)/3.7kw(10min./25%ED)
Dimensions (W×D×H)2,250 × 1,200 × 1,700mm
Power consumption4.8KVA

Backworking Attachment

Max.chucking diameterø 20mm (25/32in)
Max.length for front ejection100mm (3-15/16in) projection length30mm (1-3/16in)
Backworking unitNumber of tools4-8 tools (type A:4 tools, type B:8 tools)
Max.drilling capabilityStationary toolø 12mm (1-2in)
Power-driven att.ø 6mm(15/64in)
Max.tapping capabilityStationary toolM10 × P1.5
Power-driven att.M5 × P0.8
Sub spindle indexing angleC-axis control
Sub spindle speedmax.10,000min-1
Sub spindle motor2.2kw(Continuous)/3.7kw(10min./25%ED)