Gantry CNC Milling Machine GMB2016
A moving-column gantry with 3000 and 4000 mm table builds and a 24-arm tool changer for even larger work.
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Double-Column Gantry Mill
Gantry CNC Milling Machine BR2516
When the part is too heavy to sit on a moving table, the table stops moving. The BR2516 fixes a 2500 by 1300 mm bed and carries the spindle over it on a double-column bridge, so a five-tonne casting stays clamped exactly where it was set. A resin-sand cast, hand-scraped structure, a 15/18.5 kW BT50 spindle and a 24-station disc changer handle milling, boring and drilling in one setup.
2500×1300mmTable size
5tTable load
236N·mSpindle torque
24Disc ATC stations
Layout
A Gantry Bed That Carries Five Tonnes
Column machines move the workpiece; gantry machines move the tool. That single change is what allows the BR2516 to hold a five-tonne casting without the table sagging, deflecting or losing its datum between operations.
- Fixed, massive bedA 2500 by 1300 mm table rated to 5 t takes machine bases, press frames and mould bases that no column machine can carry.
- Full enclosure, vertical frameThe vertical frame layout and full guarding keep chips and coolant inside, with a chip storage box and a spindle-nose cleaning air blast.
- Resin-sand cast structureA dense, uniform casting that suppresses the vibration that would otherwise mark the finished surface.
- Choice of controlSIEMENS, KND, FANUC, MITSUBISHI or GSK, matched to your operators and your integration requirements.
Gantry Geometry
Span, Ram and Rail at a Glance
On a gantry mill the numbers that decide capacity are not just travel — they are the distances between the columns, the ram cross-section and the rail class.
1650mmWorking width between columns
750mmZ travel on the ram
900mmMax spindle nose to table
55mmRoller guide width, X and Y
Wide Working Envelope
A 1650 mm Y travel across a 1300 mm table lets a single long part be repositioned for several setups without leaving the machine.
Box Ram on Hard Ways
The Z axis runs on a hard-way T-slot ram rather than a rail, which is the stiffer choice for plunging cuts into cast iron and steel.
Roller Guides, Hardened and Ground
X and Y use paired 55 mm roller guides in P class, quality-hardened and precision-ground for rigidity and long service under heavy loads.
Technical Data
BR2516 Technical Data
Every figure below is transcribed from the machine parameter table.
| Parameter | Value |
|---|---|
| X axis travel | 2500 mm |
| Y axis travel | 1650 mm |
| Z axis travel | 750 mm |
| Spindle nose to table | 150–900 mm |
| Table size | 2500 × 1300 mm |
| Table load | 5 t |
| T-slots | 22 × 180 × 7 mm |
| Spindle speed | 6000 rpm, stepless within range |
| Spindle taper | BT50 |
| Spindle power | 15 / 18.5 kW |
| Spindle torque | 236 N·m |
| X / Y guideway | 55 × 2 roller guide, P class |
| Z axis | T-slot ram on hard ways |
| Ball screw accuracy | C3 class |
| Ball screw diameter X/Y/Z | 63 / 50 / 50 mm |
| Screw lead, all axes | 10 mm |
| Motor coupling | Direct coupled |
| X / Y axis motor | bis 40 N·m |
| Z axis motor | bis 40 N·m with brake, nitrogen balanced |
| Rapid traverse X / Y / Z | 15,000 / 15,000 / 12,000 mm/min |
| Cutting feed rate | 0–10,000 mm/min, three axes simultaneous |
| Max tool length / diameter / weight | 300 mm / Ø100 mm / 15 kg |
| Tool change time | 6 s |
| Positioning accuracy | 0.010 / 1000 mm |
| Repeatability | 0.006 / 1000 mm |
| Minimum input increment | 0.001 mm |
| Power capacity | 55 kVA |
| Net weight | 19 t, double-layer structure |
| Packing size | 7200 × 3900 × 3500 mm |
The datasheet lists the tooling figures (300 mm length, Ø100 mm diameter, 15 kg, BT50) as options. Control system, spindle option and tooling package are confirmed against your drawing before production.
Axis Construction
Axis by Axis: Guides, Screws and Motors
The three axes are not built the same way. This is deliberate — each one is chosen for the load it actually carries.
| Axis | Guideway | Ball screw | Motor | Rapid |
|---|---|---|---|---|
| X (gantry travel) | 55 × 2 roller guide, P class | Ø63 mm, C3, 10 mm lead | bis 40 N·m servo | 15,000 mm/min |
| Y (cross rail) | 55 × 2 roller guide, P class | Ø50 mm, C3, 10 mm lead | bis 40 N·m servo | 15,000 mm/min |
| Z (ram) | T-slot ram on hard ways | Ø50 mm, C3, 10 mm lead | bis 40 N·m servo with brake | 12,000 mm/min |
Preloaded, Direct-Coupled Screws
Ball screws are directly coupled to the servos with preloaded bearings at each end — six on X, six on Y and five on Z — removing backlash and keeping the screw in tension.
Lubricated at Every Axis
A lubrication circuit feeds every drive, cutting friction and wear, while the scraped ways hold oil in their pockets so the guides stay lubricated through long cuts.
Balanced Ram
A nitrogen balance cylinder offsets the weight of the spindle head, so the Z servo works against cutting force rather than gravity, which is what protects high-speed, high-accuracy Z moves.
Cutting Performance
Built for Interrupted, Heavy Cuts
Gantry work is rarely delicate. The structure and the tooling package are sized for roughing as much as finishing.
Rigid Under Load
Enough stiffness to resist cutting and torsional loads, with the structural damping that keeps a heavy cut from marking the surface.
Hand-Scraped Ways
Hand scraping produces a wider, more accurate bearing surface, so the machine holds geometry under load instead of deflecting into the cut.
Three-Axis Simultaneous
The X, Y and Z servos interpolate together, so contours, radii and large bores are cut in one continuous pass.
Smooth, Accurate Surfaces
AI contour control, nano smoothing and arc-corner functions produce a surface that needs less hand finishing after the machine.
Applications
Large Parts the Gantry Bed Accepts
Work that is defined by size and weight rather than by tolerance alone.
01
Machine Bases & Beds
Base castings, slide beds and machine frames milled, drilled and bored flat in a single clamping.
02
Mould Bases & Plates
Large mould bases, bolster plates and die plates with many drilled, tapped and bored stations across the face.
03
Structural Weldments
Fabricated frames and weldments machined after welding, when distortion makes re-clamping on a small machine impractical.
04
Energy & Heavy Equipment
Gearbox housings, bearing pedestals and heavy plant components typical of the energy and heavy-equipment sectors.
05
Rail & Transport
Long structural components that need several faces and hole patterns machined to a common datum.
06
Job-Shop Heavy Work
Subcontract machining where the machine has to accept whatever arrives next, from a plate to a casting.
Related Models
Compare With Other Milling Builds
Smaller parts are faster on a vertical machine; even larger work suits the moving-column GMB2016.
Vertical Machining Center VMC855
A faster, compact alternative for parts up to about 800 mm that do not need the gantry bed.
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Drilling & Tapping Center BR600
The opposite end of the range: a high-speed machine for small parts with many holes and threads.
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FAQ
Gantry CNC Milling Machine BR2516 Questions
The table measures 2500 by 1300 mm and is rated to a 5 tonne load, with travel of 2500 mm in X, 1650 mm in Y and 750 mm in Z. The spindle nose reaches from 150 to 900 mm above the table, so tall castings and weldments fit as well as large plates. Parts that would be too heavy or too large to clamp on a column machine belong here.
Resin-sand casting gives a dense, uniform iron structure that absorbs cutting vibration, and the hand-scraping of the guideways produces a large, accurate contact area between the sliding surfaces. The scraped surface also holds lubricating oil in fine pockets, which keeps the guideways lubricated, reduces friction and extends their working life under heavy cutting loads.
The spindle is a BT50 unit rated 15 kW continuous and 18.5 kW peak, delivering up to 236 N·m of torque at speeds up to 6000 rpm with stepless variation across the range. A 24-station disc automatic tool changer swaps tools in about 6 seconds and accepts tools up to 300 mm long, 100 mm in diameter and 15 kg in weight.
The machine can be supplied with SIEMENS, KND, FANUC, MITSUBISHI or GSK controls depending on your preference and your operators' experience. The configuration shown in the datasheet uses FANUC 0i MF Plus with AICC2, nano smoothing, arc corner and mirror machining functions, and a bilingual 10.4 inch colour display.
At a net weight of 19 tonnes in the double-layer structure, the machine is packed to 7200 by 3900 by 3500 mm and shipped by sea freight. We supply the full export documentation, and our engineers support the levelling, commissioning and accuracy verification on site or over video.
Standard gantry builds ship in 30 to 45 working days after deposit, and more heavily customised travel or spindle configurations take longer. Each machine is geometrically checked and test cut before packing, and the inspection record ships with it. Volume terms are agreed per order.