Gantry CNC Milling Machine BR2516
A fixed-bed gantry with a 2500 mm table rated to 5 t and a 24-station disc tool changer.
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Moving-Column Gantry Mill
Gantry CNC Milling Machine GMB2016
The GMB2016 moves the columns, not the workpiece. A 3000 to 4000 mm envelope and a 1000 mm Z travel sit inside a footprint far shorter than a fixed-column gantry of the same reach, which is the whole point of the moving-column layout. High-strength castings, a 24-arm tool changer and a nitrogen-balanced spindle head keep heavy milling, boring and drilling accurate on large plates and frames.
4000mmX travel, large build
1000mmZ travel
22kWSpindle power, large build
24Arm ATC stations
Layout
Moving Column, Fixed Bed, Bigger Envelope
A fixed-column gantry has to be long enough to stroke the table past both ends of the part. A moving-column gantry travels the structure instead, so the same 3000 or 4000 mm envelope needs a shorter machine — and less of your shop floor.
- Travel without the footprintLarge X and Y travel in a compact machine, chosen when floor space is as fixed as the budget.
- Stress-relieved castingsBed, table, columns, cross beam, saddle and headstock are cast in high-strength iron and aged to remove internal stress before they are machined.
- Ribbed for rigidityThe rib pattern was designed in 3D to raise stiffness where the cutting load is highest, so precision and part consistency hold through the shift.
- Maintenance-conscious buildAn integrated electrical and mechanical layout with a central control panel keeps routine service quick and running costs low.
Span & Table Matrix
Two Builds: LM3020 and LM4024
The datasheet prints this gantry range as two columns. Column spacing matters as much as table size — it sets how wide a part can pass between the uprights.
| Parameter | LM3020 | LM4024 |
|---|---|---|
| Table size | 3000 × 1800 mm | 4000 × 2070 mm |
| X travel | 3000 mm | 4000 mm |
| Y travel | 2200 mm | 2400 mm |
| Z travel | 1000 mm | 1000 mm |
| Column spacing | 2200 mm | 2400 mm |
| T-slots | 9 × 22 × 180 mm | 9 × 28 × 220 mm |
| Spindle nose to table | 200–1200 mm | 200–1200 mm |
| Spindle power | 18 kW | 22 kW |
| Spindle speed | 30–6000 rpm | 30–6000 rpm |
| Spindle taper | BT50 | BT50 |
| Feed rate X / Y / Z | 8000 / 8000 / 6000 mm/min | 8000 / 8000 / 6000 mm/min |
| Rapid X / Y / Z | 15,000 / 15,000 / 12,000 mm/min | 15,000 / 15,000 / 12,000 mm/min |
| Positioning accuracy | 0.022 mm | 0.022 mm |
| Repeatability | 0.012 mm | 0.012 mm |
| Machine dimensions | 8800 × 4000 mm | 9300 × 4300 mm |
| Machine weight | 30,000 kg | 38,000 kg |
The datasheet presents this gantry range under the LM3020 and LM4024 designations. The two builds are shown here so you can compare span, table and spindle directly; the standard build for a GMB2016 order is confirmed on the build sheet.
Technical Data
GMB2016 Technical Data
The shared specification that applies to both builds, transcribed from the parameter table.
| Parameter | Value |
|---|---|
| Machine type | Moving-column gantry machining centre |
| Spindle taper | BT50 |
| Tool magazine | 24-arm automatic tool changer |
| Z axis | 1000 mm travel, nitrogen balance cylinder |
| Structure material | High-strength iron castings, resin-sand process, aged |
| Ball screws | Hiwin or PMI |
| Spindle unit | Posa, VOLIS or Roral |
| Screw bearings | TPI, NSK or SKF |
| Lubrication | Single-line damping system |
| Coolant pump | PMY-25-5 |
| Control options | GSK / KND / SIEMENS / FANUC / MITSUBISHI |
Component brands are the datasheet's listed alternatives and are matched to the machine build. Control system, spindle option and options package are confirmed before production.
Component Set
Inside the Casting: What Carries the Load
A gantry is only as accurate as the parts that move on it. These are the units that decide how the machine behaves in a heavy cut.
Spindle Unit
A Taiwan spindle unit, high-speed and high-precision, chosen for surface finish as much as for power.
Arm Tool Changer
A 24-arm magazine from OKADA, DETA or HDW, changed from the program so long cycles run unattended.
Ball Screws
Hiwin or PMI screws with TPI, NSK or SKF bearings, keeping the three axes accurate and repeatable.
Coolant & Lubrication
A PMY-25-5 coolant pump and single-line damping lubrication, with a spindle-nose cleaning air blast.
Z-Axis Behaviour
Why the Spindle Head Runs on Nitrogen
A 1000 mm Z axis carries a large, heavy headstock. Without help, the Z servo would fight that mass on every rapid and every feed change, and the axis would sag when the drive relaxed.
- The balance cylinder offsets head weightA nitrogen-charged cylinder supports most of the spindle head mass, so the servo mostly moves the load it was sized to move.
- Higher speed and accuracyWith less mass to accelerate, the Z axis reaches its 12,000 mm/min rapid and holds position more precisely.
- Better surface finishStable Z behaviour shows up directly in the finish of bored holes, shoulders and pockets.
- Less wear on the driveLower continuous load on the Z servo and screw bearings extends their working life.
Applications
Frames, Mould Bases and Heavy Plates
Work that is defined by its dimensions, its weight or both.
01
Mould Bases & Die Plates
Large mould bases and die plates with many holes, bores and faces machined to a single datum.
02
Machine Frames
Beds, columns and frames for machine builders, rough machined and finished on the same bed.
03
Press & Forming Tooling
Heavy forming dies, bolster plates and press tooling where rigidity in the cut is what protects the tool edge.
04
Energy Sector Parts
Gearbox housings, bearing housings and valve bodies for power generation and heavy industry.
05
Structural Components
Large welded frames and structures machined after fabrication to correct distortion.
06
General Heavy Machining
Subcontract work where the machine has to accept plates up to four metres long without re-setup.
Related Models
Other Gantry and Vertical Mills
Compare the two gantry builds, or step down to a vertical machine for smaller parts.
Vertical Machining Center VMC855
A five-axis capable vertical machine for smaller moulds and components at higher cycle speed.
View model
Vertical CNC Milling Machine XK7136
A long-table vertical mill with 860 mm X travel for elongated parts on a smaller budget.
View model
FAQ
Gantry CNC Milling Machine GMB2016 Questions
In a moving-column gantry the columns and cross rail travel along the bed while the workpiece stays fixed. Because the machine does not need a long table stroke to reach the ends of the part, a 3000 or 4000 mm envelope fits into a noticeably shorter footprint than a fixed-column machine of the same capacity. The result is large travel without the extra shop space that usually goes with it.
The spindle head is heavy, and on a 1000 mm Z axis that weight would have to be carried by the Z servo. The nitrogen balance cylinder offsets most of the head weight, so the servo works against cutting force instead of gravity. That makes the Z axis faster, more accurate and less prone to sag or stick-slip at high feed rates.
The bed, table, columns, cross beam, saddle and spindle head are all cast from high-strength iron using the resin-sand process, then aged to relieve the internal stresses that cutting forces would otherwise release as distortion. The ribbing pattern, designed in 3D, raises rigidity further, and the moving-column layout keeps the cutting force close to the structure that resists it.
The datasheet lists two builds: a 3000 by 1800 mm table with a 2200 mm column spacing and an 18 kW spindle, and a 4000 by 2070 mm table with a 2400 mm column spacing and a 22 kW spindle. Both carry a BT50 taper, a 1000 mm Z travel and spindle speeds from 30 to 6000 rpm.
Tool changers come from OKADA, DETA or HDW; spindle units from Posa, VOLIS or Roral; ball screws from Hiwin or PMI; pneumatic components from AirTAC; unclamping cylinders from Hao cheng; lubrication pumps from Hu run or HERG; screw bearings from TPI, NSK or SKF; and the coolant pump is a PMY-25-5. The three-axis motors are matched to the selected CNC system.
Options include an indexing head, an automatic chip conveyor, a fixture kit, a machine vice, spindle speeds above 12,000 rpm with a direct-drive spindle, a 65 mm centre probe with a split probe unit, a Z-axis indicator, spindle through-coolant with an oil-water separator, a 10,000 rpm spindle and video monitoring. Options are confirmed on the build sheet before production.