JTEKT Machinery North America | LB321

Bridge Mills and Gantry Mills

Power and endurance for heavy jobs demanding accuracy and high productivity.

LB321

The LB321 is a double column, fixed rail bridge machine designed for heavy cutting applications. It features a robust geared-head spindle, a hydraulic counterbalance system on the headstock, and a Meehanite cast iron base. These features allow the machine to excel in the heaviest of cuts.


The LB321YM model has extended Y-axis travel with 5-face machining capabilities to allow for the machining of complex workpieces. This machine features automatic tool changes in the vertical and horizontal orientations and offers automatic clamping of the headstock. Headstock options include 30 degree, 90 degree, extension, and manual universal.

JTEKT Advantage ROI Justification MACHINE SELECTOR
Bridge Mill CNC Control
Bridge Mill Machine Construction

FERROUS SPECS

Table Size 118" x 78.7" (3,000 mm x 2,000 mm)
X-Axis Travel 120.5" (3,060 mm)
Y-Axis Travel 84.6" (2,150 mm)
Y-axis Travel for -YM Configuration 110.2" (2,800 mm)
Z-Axis Travel 31.5" (800 mm)
Optional Z-axis Travel 39.4" (1,000 mm), 47.2" (1,200 mm), 55.1" (1,400 mm)
Distance from Spindle Nose to Table Top 7.9" to 39.4" (200 mm to 1,000 mm)
Distance Between Columns 90.5" (2,300 mm)
Maximum Table Load 26,450 lb (12,000 kg)
Spindle Drive Motor (30 min. / cont.) 6,000 RPM: 35 HP (26 kW) / 30 HP (22 kW)
Spindle Drive Motor (30 min. / cont.) 5:000 RPM: 40 HP (30 kW) / 35 HP (26 kW)
Spindle Output Torque 5:000 RPM: 40 HP (30 kW) / 35 HP (26 kW)
Spindle Output Torque 5,000 RPM: 1,115 ft-lb (1,512 Nm)
Spindle Speed Gearbox (CAT50):  6,000 RPM
Spindle Speed Gearbox (CAT50):  5,000 RPM
Rapid Feedrate (X axis) 945 ipm (24 m/min)
Rapid Feedrate (Y axis) 787 ipm (20 m/min)
Rapid Feedrate (Z axis) 590 ipm (15 m/min)
Maximum Cutting Feedrate 394 ipm (10 m/min)
Tool Storage Capacity 32 Standard  (60, 90, 120 Optional)
Standard Floor Space 339" x 209" x 171" (8,610 mm x 5,300 mm x 4,350 mm)
Standard Net Weight 64,900 lb (29,500 kg)

NON-FERROUS SPECS

Table Size 118" x 78.7" (3,000 mm x 2,000 mm)
X-Axis Travel 120.5" (3,060 mm)
Y-Axis Travel 84.6" (2,150 mm)
Y-axis Travel for -YM Configuration 110.2" (2,800 mm)
Z-Axis Travel 31.5" (800 mm)
Optional Z-axis Travel 39.4" (1,000 mm), 47.2" (1,200 mm), 55.1" (1,400 mm)
Distance from Spindle Nose to Table Top 7.9" to 39.4" (200 mm to 1,000 mm)
Distance Between Columns 90.5" (2,300 mm)
Maximum Table Load 26,450 lb (12,000 kg)
Spindle Drive Motor (30 min. / cont.) 10,000 RPM: 40 HP (29.8 kW) / 35 HP (26 kW)
Spindle Drive Motor (30 min. / cont.) 12,000 RPM: 40 HP (29.8 kW) / 35 HP (26 kW)
Spindle Drive Motor (30 min. / cont.) 20,000 RPM: 50 HP (37 kW) / 35 HP (26 kW)
Spindle Output Torque 10,000 RPM: 258 ft-lb (350 Nm)
Spindle Output Torque 12,000 RPM: 305 ft-lb (414 Nm)
Spindle Output Torque 20,000 RPM: 86 ft-lb (117 Nm)
Spindle Speed Direct Drive (CAT50): 10,000 RPM
Spindle Speed Integral Motor (CAT50): 12,000 RPM
Spindle Speed Integral Motor (HSK63): 20,000 RPM
Rapid Feedrate (X axis) 945 ipm (24 m/min)
Rapid Feedrate (Y axis) 787 ipm (20 m/min)
Rapid Feedrate (Z axis) 590 ipm (15 m/min)
Maximum Cutting Feedrate 394 ipm (10 m/min)
Tool Storage Capacity 32 Standard  (60, 90, 120 Optional)
Standard Floor Space 339" x 209" x 171" (8,610 mm x 5,300 mm x 4,350 mm)
Standard Net Weight 64,900 lb (29,500 kg)

HIGH TEMP ALLOY SPECS

Table Size 118" x 78.7" (3,000 mm x 2,000 mm)
X-Axis Travel 120.5" (3,060 mm)
Y-Axis Travel 84.6" (2,150 mm)
Y-axis Travel for -YM Configuration 110.2" (2,800 mm)
Z-Axis Travel 31.5" (800 mm)
Optional Z-axis Travel 39.4" (1,000 mm), 47.2" (1,200 mm), 55.1" (1,400 mm)
Distance from Spindle Nose to Table Top 7.9" to 39.4" (200 mm to 1,000 mm)
Distance Between Columns 90.5" (2,300 mm)
Maximum Table Load 26,450 lb (12,000 kg)
Spindle Drive Motor (30 min. / cont.) 6,000 RPM: 35 HP (26 kW) / 30 HP (22 kW)
Spindle Drive Motor (30 min. / cont.) 12,000 RPM: 40 HP (29.8 kW) / 35 HP (26 kW)
Spindle Output Torque 6,000 RPM: 388 ft-lb (526 Nm)
Spindle Output Torque 12,000 RPM: 305 ft-lb (414 Nm)
Spindle Speed Gearbox (CAT50):  6,000 RPM
Spindle Speed Integral Motor (CAT50): 12,000 RPM
Rapid Feedrate (X axis) 945 ipm (24 m/min)
Rapid Feedrate (Y axis) 787 ipm (20 m/min)
Rapid Feedrate (Z axis) 590 ipm (15 m/min)
Maximum Cutting Feedrate 394 ipm (10 m/min)
Tool Storage Capacity 32 Standard  (60, 90, 120 Optional)
Standard Floor Space 339" x 209" x 171" (8,610 mm x 5,300 mm x 4,350 mm)
Standard Net Weight 64,900 lb (29,500 kg)

ACCURACY

Linear Position Accuracy± 0.0006" (0.015 mm) full travel
Linear Repeatability± 0.0001" (0.003 mm)

REEQUIREMENTS

Coolant Tank Capacity132 gallon
Air Source90 psi @ 3.78 CFM
Total power RequiredAC 220V ±10% (60 kVA)
Table Size 118" x 78.7" (3,000 mm x 2,000 mm)
X-Axis Travel 120.5" (3,060 mm)
Y-Axis Travel 84.6" (2,150 mm)
Y-axis Travel for -YM Configuration 110.2" (2,800 mm)
Z-Axis Travel 31.5" (800 mm)
Optional Z-axis Travel 39.4" (1,000 mm), 47.2" (1,200 mm), 55.1" (1,400 mm)
Distance from Spindle Nose to Table Top 7.9" to 39.4" (200 mm to 1,000 mm)
Distance Between Columns 90.5" (2,300 mm)
Maximum Table Load 26,450 lb (12,000 kg)
Spindle Drive Motor (30 min. / cont.) 6,000 RPM: 35 HP (26 kW) / 30 HP (22 kW)
Spindle Drive Motor (30 min. / cont.) 5:000 RPM: 40 HP (30 kW) / 35 HP (26 kW)
Spindle Output Torque 5:000 RPM: 40 HP (30 kW) / 35 HP (26 kW)
Spindle Output Torque 5,000 RPM: 1,115 ft-lb (1,512 Nm)
Spindle Speed Gearbox (CAT50):  6,000 RPM
Spindle Speed Gearbox (CAT50):  5,000 RPM
Rapid Feedrate (X axis) 945 ipm (24 m/min)
Rapid Feedrate (Y axis) 787 ipm (20 m/min)
Rapid Feedrate (Z axis) 590 ipm (15 m/min)
Maximum Cutting Feedrate 394 ipm (10 m/min)
Tool Storage Capacity 32 Standard  (60, 90, 120 Optional)
Standard Floor Space 339" x 209" x 171" (8,610 mm x 5,300 mm x 4,350 mm)
Standard Net Weight 64,900 lb (29,500 kg)
Table Size 118" x 78.7" (3,000 mm x 2,000 mm)
X-Axis Travel 120.5" (3,060 mm)
Y-Axis Travel 84.6" (2,150 mm)
Y-axis Travel for -YM Configuration 110.2" (2,800 mm)
Z-Axis Travel 31.5" (800 mm)
Optional Z-axis Travel 39.4" (1,000 mm), 47.2" (1,200 mm), 55.1" (1,400 mm)
Distance from Spindle Nose to Table Top 7.9" to 39.4" (200 mm to 1,000 mm)
Distance Between Columns 90.5" (2,300 mm)
Maximum Table Load 26,450 lb (12,000 kg)
Spindle Drive Motor (30 min. / cont.) 10,000 RPM: 40 HP (29.8 kW) / 35 HP (26 kW)
Spindle Drive Motor (30 min. / cont.) 12,000 RPM: 40 HP (29.8 kW) / 35 HP (26 kW)
Spindle Drive Motor (30 min. / cont.) 20,000 RPM: 50 HP (37 kW) / 35 HP (26 kW)
Spindle Output Torque 10,000 RPM: 258 ft-lb (350 Nm)
Spindle Output Torque 12,000 RPM: 305 ft-lb (414 Nm)
Spindle Output Torque 20,000 RPM: 86 ft-lb (117 Nm)
Spindle Speed Direct Drive (CAT50): 10,000 RPM
Spindle Speed Integral Motor (CAT50): 12,000 RPM
Spindle Speed Integral Motor (HSK63): 20,000 RPM
Rapid Feedrate (X axis) 945 ipm (24 m/min)
Rapid Feedrate (Y axis) 787 ipm (20 m/min)
Rapid Feedrate (Z axis) 590 ipm (15 m/min)
Maximum Cutting Feedrate 394 ipm (10 m/min)
Tool Storage Capacity 32 Standard  (60, 90, 120 Optional)
Standard Floor Space 339" x 209" x 171" (8,610 mm x 5,300 mm x 4,350 mm)
Standard Net Weight 64,900 lb (29,500 kg)
Table Size 118" x 78.7" (3,000 mm x 2,000 mm)
X-Axis Travel 120.5" (3,060 mm)
Y-Axis Travel 84.6" (2,150 mm)
Y-axis Travel for -YM Configuration 110.2" (2,800 mm)
Z-Axis Travel 31.5" (800 mm)
Optional Z-axis Travel 39.4" (1,000 mm), 47.2" (1,200 mm), 55.1" (1,400 mm)
Distance from Spindle Nose to Table Top 7.9" to 39.4" (200 mm to 1,000 mm)
Distance Between Columns 90.5" (2,300 mm)
Maximum Table Load 26,450 lb (12,000 kg)
Spindle Drive Motor (30 min. / cont.) 6,000 RPM: 35 HP (26 kW) / 30 HP (22 kW)
Spindle Drive Motor (30 min. / cont.) 12,000 RPM: 40 HP (29.8 kW) / 35 HP (26 kW)
Spindle Output Torque 6,000 RPM: 388 ft-lb (526 Nm)
Spindle Output Torque 12,000 RPM: 305 ft-lb (414 Nm)
Spindle Speed Gearbox (CAT50):  6,000 RPM
Spindle Speed Integral Motor (CAT50): 12,000 RPM
Rapid Feedrate (X axis) 945 ipm (24 m/min)
Rapid Feedrate (Y axis) 787 ipm (20 m/min)
Rapid Feedrate (Z axis) 590 ipm (15 m/min)
Maximum Cutting Feedrate 394 ipm (10 m/min)
Tool Storage Capacity 32 Standard  (60, 90, 120 Optional)
Standard Floor Space 339" x 209" x 171" (8,610 mm x 5,300 mm x 4,350 mm)
Standard Net Weight 64,900 lb (29,500 kg)
Linear Position Accuracy± 0.0006" (0.015 mm) full travel
Linear Repeatability± 0.0001" (0.003 mm)
Coolant Tank Capacity132 gallon
Air Source90 psi @ 3.78 CFM
Total power RequiredAC 220V ±10% (60 kVA)

Specifications are subject to change without notice.

Featured JTEKT News

Advanced Control System on JTEKT Machinery Bridge Mills

All Stealth VB, SB and LB bridge mills utilize a Fanuc 0iM control.

Full Line of Bridge Mills and Gantry Mills

VB Series

Job Shop FANUC Oi Double Column Bridge Mill
X-Axis: 79.5" (2,020mm) to 158.2" (4,020mm)
Y-Axis: 59" (1,500mm) to 78.7" (2,000mm)
Z-Axis: 31.5" (800mm)
Spindle: #50 6,000 RPM Geared Head

View Models

RB Series

FANUC 31i Double Column Bridge Mill
X-Axis: 83.5" (2,120mm) to 120.5" (3,060mm)
Y-Axis: 47.2" (1,200mm)
Z-Axis: 31.5" (800mm)
Spindle: #50 6K Geared or Highspeed Options

View Models

SB Series

FANUC 31i Double Column Bridge Mill
X-Axis: 83.5" (2,120mm) to 159.8" (4,060mm)
Y-Axis: 63" (1,600mm) to 90.5" (2,300mm)
Z-Axis: 31.5" (800mm) to 39.3" (1000mm)
Spindle: Geared Head or Highspeed Options
Five-Face/Right Angle Head Capable

View Models

LB Series

FANUC 31i Double Column Bridge Mill
X-Axis: 120.5" (3,060mm) to 253.8" (10,000mm)
Y-Axis: 84.6" (2,150mm) to 157.5" (4,000mm)
Z-Axis: 31.5" (800mm) to 55.1" (1400mm)
Spindle: Geared Head or Highspeed Options
Five-Face/Right Angle Head Capable

View Models

LB Series (cont.)

FANUC 31i Double Column Bridge Mill
X-Axis: 120.5" (3,060mm) to 253.8" (10,000mm)
Y-Axis: 84.6" (2,150mm) to 157.5" (4,000mm)
Z-Axis: 31.5" (800mm) to 55.1" (1400mm)
Spindle: Geared Head or Highspeed Options
Five-Face/Right Angle Head Capable

View Models
MG Series Gantry Mill

MG Series

FANUC 31i Moving Gantry Mill
X-Axis: 197" (5,000mm) to 787.4" (20,000mm)
Y-Axis: 118.1" (3,000mm) to 236.2" (6,000mm)
Z-Axis: 31.5" (800mm) to 55.1" (1400mm)
Spindle: Geared Head or Highspeed Options
Five-Face/Right Angle Head Capable

View Models
MG Series Gantry Mill

MG Series (cont.)

FANUC 31i Moving Gantry Mill
X-Axis: 197" (5,000mm) to 787.4" (20,000mm)
Y-Axis: 118.1" (3,000mm) to 236.2" (6,000mm)
Z-Axis: 31.5" (800mm) to 55.1" (1400mm)
Spindle: Geared Head or Highspeed Options
Five-Face/Right Angle Head Capable

View Models