LB Series | JTEKT Machinery North America

LB Series

The LB Series is a high-performance, double-column fixed rail bridge machine engineered for the most demanding heavy cutting applications. Built with strength and precision in mind, the LB Series delivers the rigidity and stability needed to tackle large-scale machining with confidence and consistency.

At its core, the machine features a robust geared-head spindle designed to generate exceptional torque and power, making it ideal for deep cuts and high material removal rates. A hydraulic counterbalance system on the headstock ensures smooth vertical movement and enhanced accuracy during extended cutting cycles. The foundation of the LB Series is a massive Meehanite® cast iron base, renowned for its superior vibration damping, tensile strength, and long-term durability. Together, these structural and mechanical features allow the LB Series to maintain precision, maximize tool life, and excel in even the most challenging machining environments.

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LB Series Structure

Rigid Structural Design

Its one-piece bridge casting and three-piece structural layout (bridge, crossbeam, and columns) provide outstanding strength, vibration dampening, and stability, even under extreme cutting conditions. To further reinforce accuracy, the LB Series integrates Y-axis roller guideways on both upper and lower sections, while ultra-heavy loading roller guides are applied across all axes to maximize durability and machining capability. 

Designed for versatility, the LB Series offers extended travels with options of up to 7,060 mm in X, 4,000 mm in Y, and 1,400 mm in Z, supporting the machining of extremely large components with confidence. For models with X-axis travel beyond 5 meters, a rotating nut feed system ensures smooth and precise movement across the full stroke. Built with dynamic simulation and finite element analysis (FEA), the LB Series achieves optimal balance between strength and precision, making it the ideal solution for industries requiring uncompromising machining performance. 


LB Series spindle

High Performance Spindle Options

The LB Series is engineered with a powerful and versatile spindle system to deliver outstanding performance in both heavy-duty roughing and high-speed precision machining. A two-speed geared transmission box ensures the torque required for ultra-heavy-duty operations and combined rough machining, while optional direct-driven spindle configurations provide the speed and smoothness needed for light alloy materials or high-speed applications.

Spindle Features

  • Two-speed geared transmission for ultra-heavy-duty and rough machining jobs
  • Optional direct-driven spindles designed for light alloys and high-speed applications
  • Standard 6,000 rpm geared spindle (CAT50) for robust, general-purpose machining
  • Optional spindle configurations:
    • 4,000 rpm geared spindle (CAT50)
    • 12,000 rpm direct-drive spindle (CAT50)
    • 15,000 rpm direct-drive spindle (CAT40)

LB Series cutting

Efficient, Heavy-Duty Machining

The LB Series can be equipped with the M Function Option, transforming it into a highly capable 5-sides machining center. This function enables automatic head exchanges, vertical and horizontal tool changes, and efficient headstock clamping, allowing complex multi-face machining in a single setup.

Automatic tool change times are optimized to approximately 35 seconds for vertical machining and 50 seconds for horizontal machining, while head exchanges are completed in about 60 seconds. This compact yet cost-effective system empowers manufacturers to achieve greater throughput without compromising machining accuracy—making it ideal for large, complex workpieces where efficiency and versatility are critical. 

In addition, precision testing—covering positioning accuracy (±0.015 mm) and repeatability (±0.003 mm)—is conducted to international JIS standards, ensuring each machine delivers uncompromising performance.


Models & Specifications

LB321LB325
Table Size (W × L)in (mm)118 × 78.7 (2997 × 1999)118 × 94.5 (2997 × 2400)
X-Axis Travelin (mm)120.5 (3061)120.5 (3061)
Y-Axis Travelin (mm)84.6 (2149)100.4 (2550)
Z-Axis Travelin (mm)31.5 (800)31.5 (800)
Z-Axis Travel (Optional)in (mm)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)
Y-Axis Travel (–YM Configuration)in (mm)110.2 (2799)125.9 (3198)
Spindle Nose to Table Topin (mm)7.9 – 39.4 (201 – 1001)7.9 – 39.4 (201 – 1001)
Maximum Table Loadlbs (kg)26450 (12008)26450 (12008)
Distance Between Columnsin (mm)90.5 (2299)106.3 (2700)
Maximum Spindle SpeedRPM60006000
Tool TaperCAT50CAT50
Maximum Cutting Feedrateipm (m/min)394 (10)394 (10)
Rapid Feedrate (X / Y / Z)ipm (m/min)945 / 787 / 590 (24 / 20 / 15)945 / 787 / 590 (24 / 20 / 15)
Tool Storage CapacityTools3232
Maximum Tool Weightlbs (kg)44.1 (20)44.1 (20)
Standard Floor Space (W × L × H)in (mm)339 × 208.7 × 236 (8611 × 5301 × 5994)339 × 224 × 171 (8611 × 5690 × 4343)
LB421LB425LB433
Table Size (W × L)in (mm)157.4 × 78.7 (3998 × 1999)157.4 × 94.5 (3998 × 2400)157.4 × 94.5 (3998 × 2400)
X-Axis Travelin (mm)159.8 (4059)159.8 (4059)159.8 (4059)
Y-Axis Travelin (mm)84.6 (2149)100.4 (2550)131.9 (3350)
Z-Axis Travelin (mm)31.5 (800)31.5 (800)31.5 (800)
Z-Axis Travel (Optional)in (mm)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)
Y-Axis Travel (–YM Configuration)in (mm)110.2 (2799)125.9 (3198)90.5 (2299)
Spindle Nose to Table Topin (mm)7.9 – 39.4 (201 – 1001)7.9 – 39.4 (201 – 1001)7.9 – 39.4 (201 – 1001)
Maximum Table Loadlbs (kg)33000 (14982)33000 (14982)33000 (14982)
Distance Between Columnsin (mm)90.5 (2299)106.3 (2700)137.8 (3500)
Maximum Spindle SpeedRPM600060006000
Tool TaperCAT50CAT50CAT50
Maximum Cutting Feedrateipm (m/min)394 (10)394 (10)394 (10)
Rapid Feedrate (X / Y / Z)ipm (m/min)709 / 787 / 590 (18 / 20 / 15)709 / 787 / 590 (18 / 20 / 15)708 / 787 / 590 (18 / 20 / 15)
Tool Storage CapacityTools323232
Maximum Tool Weightlbs (kg)44.1 (20)44.1 (20)44.1 (20)
Standard Floor Space (W × L × H)in (mm)417 × 208.7 × 171 (10592 × 5301 × 4343)490.2 × 270.2 × 236 (12451 × 6863 × 5994)423.1 × 310.1 × 171.3 (10747 × 7877 × 4351)
LB521LB525LB533
Table Size (W × L)in (mm)198.6 × 78.7 (5044 × 1999)196.8 × 94.5 (4999 × 2400)196.8 × 94.5 (4999 × 2400)
X-Axis Travelin (mm)199.2 (5060)199.2 (5060)199.2 (5060)
Y-Axis Travelin (mm)84.6 (2149)100.4 (2550)131.9 (3350)
Z-Axis Travelin (mm)31.5 (800)31.5 (800)31.5 (800)
Z-Axis Travel (Optional)in (mm)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)
Y-Axis Travel (–YM Configuration)in (mm)110.2 (2799)125.9 (3198)90.5 (2299)
Spindle Nose to Table Topin (mm)7.9 – 39.4 (201 – 1001)7.9 – 39.4 (201 – 1001)7.9 – 39.4 (201 – 1001)
Maximum Table Loadlbs (kg)39600 (17978)39600 (17978)39600 (17978)
Distance Between Columnsin (mm)90.5 (2299)106.3 (2700)137.8 (3500)
Maximum Spindle SpeedRPM600060006000
Tool TaperCAT50CAT50CAT50
Maximum Cutting Feedrateipm (m/min)315 (8)394 (10)394 (10)
Rapid Feedrate (X / Y / Z)ipm (m/min)492 / 787 / 590 (12 / 20 / 15)492 / 787 / 590 (12 / 20 / 15)492 / 590 / 590 (12 / 15 / 15)
Tool Storage CapacityTools323232
Maximum Tool Weightlbs (kg)44.1 (20)44.1 (20)44.1 (20)
Standard Floor Space (W × L × H)in (mm)508 × 208.7 × 236 (12903 × 5301 × 5994)498 × 224 × 171 (12649 × 5690 × 4343)514.6 × 310.1 × 171.3 (13071 × 7877 × 4351)
LB625LB633
Table Size (W × L)in (mm)236.2 × 94.5 (5999 × 2400)236.2 × 94.5 (5999 × 2400)
X-Axis Travelin (mm)238.5 (6058)238.5 (6058)
Y-Axis Travelin (mm)100.4 (2550)131.9 (3350)
Z-Axis Travelin (mm)31.5 (800)31.5 (800)
Z-Axis Travel (Optional)in (mm)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)39.4 / 47.2 / 55.1 (1001 / 1199 / 1400)
Y-Axis Travel (–YM Configuration)in (mm)90.5 (2299)90.5 (2299)
Spindle Nose to Table Topin (mm)7.9 – 39.4 (201 – 1001)7.9 – 39.4 (201 – 1001)
Maximum Table Loadlbs (kg)44000 (19976)44000 (19976)
Distance Between Columnsin (mm)106.3 (2700)137.8 (3500)
Maximum Spindle SpeedRPM60006000
Tool TaperCAT50CAT50
Maximum Cutting Feedrateipm (m/min)315 (8)394 (10)
Rapid Feedrate (X / Y / Z)ipm (m/min)354 / 787 / 590 (9 / 20 / 15)354 / 590 / 590 (9 / 15 / 15)
Tool Storage CapacityTools3232
Maximum Tool Weightlbs (kg)44.1 (20)44.1 (20)
Standard Floor Space (W × L × H)in (mm)568 × 224 × 171 (14427 × 5690 × 4343)596.8 × 310.1 × 171.3 (15159 × 7877 × 4351)