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ROUNDTOP MACHINERY INDUSTRIES CO., LTD.
The fact that ROUNDTOP has had very rapid growth since our establishment has not changed our view that every day is an opportunity for even greater achievement. In 1979 we were producing only one model of conventional milling machine. Now we are one of the most diversified manufacturers producing vertical machining centers, horizontal machining centers, double column machining centers, Multi-Axis/5-Face Machining Centers, vertical turning centers, high speed machining centers and CNC lathes.

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ST-60
 
Please visit our on-line digital catalogs for details.
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Features

  1. Operations of internal and external machining for turning, boring and facing both ends of medium or small size parts can be finished in one setting.
  2. Save time on part loading, unloading and tool setting between two operations and increase productivities.
  3. Second operation can be processed right after bar material being cut off.
  4. Finished parts will be collected with programmable parts catcher (optional) automatically.
  5. This lathe is one of the supreme efficient productive machines.




ITEM \ MODEL ST-60A ST-60B ST-60C
Swing Over Bed (mm) 790 (31.1")
Swing Over Cross Slide (mm) 600 (23.6")
Chuck Size (mm) 304 (12") (Std.) 
381 (15") (Opt.)
381 (15") (Std.) 
450 (17.7") (Opt.)
510 (20.1") (Std.) 
610 (24") (Opt.)
Bar Capacity (mm) 91 (3.6") (Std.) 
102 (4") (Opt.)
116 (4.6") 139 (5.5")
Spindle Nose A2-8 / A2-11 (Opt.) A2-11 A2-15
Spindle Bore (mm) 115 (4.5") 132.5 (5.2") 152 (6")
Spindle Speed, Step (s) Auto Hi-Lo Auto 4 Speeds
Spindle Speed Range (rpm) Belt Type Gear Box 3000 for 12" (91) Chuck 
2800 for 12" (102) Chuck 
2500 for 15" (102) Chuck
2000 1500 (Std.) 
1400 (Opt.)
Geared Headstock
- 1200
Spindle Motor (kW) (30 min/con.) 22 / 26 22 / 26 (Std.) 
30 / 37 (Opt.)
30 / 37 (Std.) 
37 / 45 (Opt.)
Spindle Bearing Diameter (mm) 160 (6.3") 180 (7.1") 200 (7.9")
No. Of Tools 12
Cross Travel (X-Axis) (mm) 320 (12.6")
Y-Axis Travel (Opt.) (mm) ±75 (3")
Longitudinal Travel (Z-Axis) (mm) 800/1200/1600 (31.5"/47.2"/63")
Rapid Traverse (m/min) X: 15 / Y: 10 / Z: 18
Tailstock Travel (mm) 500/900/1300 (19.7"/35.4"/51.2")
Tailstock Quill Travel (mm) 125 (4.9")
Tailstock Quill Diameter (mm) ∅125 (4.9")
Tailstock Spindle Taper MT#5
Servo Motor (X-Axis) (kW) 4
Servo Motor (Y-Axis)(Opt.) (kW) 3
Servo Motor (Z-Axis) (kW) 4
Bed Inclination 60°
Weight (kg) (lb) 12000 
(26400)
12100 
(26620)
13150 
(28930)
Machine Dimensions (mm) W x H 2270 x 2765 (89.4" x 108.9") 
2290 x 2765 (90.2" x 108.9") (for ST-70)
L 5132 / 6195 / 6482 
(202" / 243.9" / 255.2")

ITEM \ MODEL ST-60AH ST-60BH ST-60CH
Swing Over Bed (mm) 920 (36.2")
Swing Over Cross Slide (mm) 700 (27.6")
Chuck Size (mm) 304 (12") (Std.) 
381 (15") (Opt.)
381 (15") (Std.) 
450 (17.7") (Opt.)
510 (20.1") (Std.) 
610 (24") (Opt.)
Bar Capacity (mm) 91 (3.6") (Std.) 
102 (4") (Opt.)
116 (4.6") 139 (5.5)
Spindle Nose A2-8 / A2-11(Opt.) A2-11 A2-15
Spindle Bore (mm) 115 (4.5") 132.5 (5.2") 152 (6")
Spindle Speed, Step (s) Auto Hi-Lo Auto 4 Speeds
Spindle Speed Range (rpm) Belt Type Gear Box 3000 for 12"(91) Chuck 
2800 for 12"(102) Chuck 
2500 for 15"(102) Chuck
2000 1500 (Std.) 
1400 (Opt.)
Geared Headstock - - 1200
Spindle Motor (kW) (30 min/con.) 22 / 26 22 / 26 (Std.) 
30 / 37 (Opt.)
30 / 37 (Std.) 
37 / 45 (Opt.)
Spindle Bearing Diameter (mm) 160 (6.3") 180 (7") 200 (7.9")
No. Of Tools 12
Cross Travel (X-Axis) (mm) 370 (14.6")
Y-Axis Travel (Opt.) (mm) ±75 (3")
Longitudinal Travel (Z-Axis) (mm) 800/1200/1600 (31.5"/47.2"/63")
Rapid Traverse (m/min) X: 15 / Y: 10 / Z: 18
Tailstock Travel (mm) 500/900/1300 (19.7"/35.4"/51.2")
Tailstock Quill Travel (mm) 125 (4.9")
Tailstock Quill Diameter (mm) ∅125 (4.9")
Tailstock Spindle Taper MT#5
Servo Motor (X-Axis) (kW) 7
Servo Motor (Y-Axis)(Opt.) (kW) 3
Servo Motor (Z-Axis) (kW) 7
Bed Inclination 60°
Weight (kg) (lb) 12100 
(26620)
12200 
(26840)
13250 
(29150)
Machine Dimensions (mm) W x H 2270 x 2765 (89.4" x 108.9") 
2290 x 2765 (90.2" x 108.9") (for ST-70)
L 5132 / 6195 / 6482 
(202" / 243.9" / 255.2")

ITEM \ MODEL ST-60AX ST-60BX ST-60CX
Swing Over Bed (mm) 1020 (40.2")
Swing Over Cross Slide (mm) 800 (31.5")
Chuck Size (mm) 304 (12") (Std.) 
381 (15") (Opt.)
381 (15") (Std.) 
450 (17.7") (Opt.)
510 (20.1") (Std.) 
610 (24") (Opt.)
Bar Capacity (mm) 91 (3.6") (Std.) 
102 (4") (Opt.)
116 (4.6") 139 (5.5")
Spindle Nose A2-8 / A2-11 (Opt.) A2-11 A2-15
Spindle Bore (mm) 115 (4.5") 132.5 (5.2") 152 (6")
Spindle Speed, Step (s) Auto Hi-Lo Auto 4 Speeds
Spindle Speed Range (rpm) Belt Type Gear Box 3000 for 12"(91) Chuck 
2800 for 12"(102) Chuck 
2500 for 15"(102) Chuck
2000 1500 (Std.) 
1400 (Opt.)
Geared Headstock
- - 1200
Spindle Motor (kW) (30 min/con.) 22 / 26 (Std.) 22 / 26 (Std.) 
30 / 37 (Opt.)
30 / 37 (Std.) 
37 / 45 (Opt.)
Spindle Bearing Diameter (mm) 160 (6.3") 180 (7.1") 200 (7.9")
No. Of Tools 12
Cross Travel (X-Axis) (mm) 420 (16.5")
Y-Axis Travel (Opt.) (mm) ±75 (3")
Longitudinal Travel (Z-Axis) (mm) 800/1200/1600 (31.5"/47.2"/63")
Rapid Traverse (m/min) X: 12 / Y: 10 / Z: 16
Tailstock Travel (mm) 500/900/1300 (19.7"/35.4"/51.2")
Tailstock Quill Travel (mm) 125 (4.9")
Tailstock Quill Diameter (mm) ∅125 (4.9")
Tailstock Spindle Taper MT#5
Servo Motor (X-Axis) (kW) 7
Servo Motor (Y-Axis)(Opt.) (kW) 3
Servo Motor (Z-Axis) (kW) 7
Bed Inclination 60°
Weight (kg) (lb) 12200 
(26840)
12300 
(27060)
13350 
(29370)
Machine Dimensions (mm) W x H 2270 x 2765 (89.4" x 108.9") 
2290 x 2765 (90.2" x 108.9") (for ST-70)
L 5132 / 6195 / 6482 
(202" / 243.9" / 255.2")




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