Battery trays, motor housings, die-cast structurals — the parallel segment guide for new-energy vehicle parts.
Product Family Guide · Global Market
Gree CNC Long-Stroke Gantry Family
Five gantry models spanning X-axis strokes from 2,700 mm to 3,700 mm — a range where most competitors cap at 2,000 mm. From high-speed direct-drive profile machining to twin five-axis structural work, this is the lineup for buyers who need long-part capability without outsourcing to a second vendor. ← Back to GREE CNC
Executive summary. Gree's gantry machining centers cover three X-axis tiers — 2.7 m (GA-GF2755), 3.7 m (GA-GF3755 / GF3766), and the fixed-beam GA-GF4028 for heavy-duty structural work — plus the GA-FMB3020D twin five-axis gantry for large die-cast parts. The key differentiator: most mainstream gantry competitors top out around 2,000 mm X-axis; Gree's family starts at 2,700 mm and extends to 3,700 mm in the same architectural platform. All long-stroke models share 20,000 rpm spindles, optical-grating full-closed-loop control, and Mehanite or granite castings for thermal stability across the full stroke. Factory-observed nameplate specs (August 2026) confirm published figures.
2,700–3,700 mm
X-axis stroke range
20,000 rpm
Max spindle speed
80 m/min
Rapid traverse (GF2755)
+25%
Efficiency gain (FMB3020D)
5 models
Gantry family members
Why long-stroke gantry matters
Long-part machining is a structural problem, not just a specs problem. A 3-meter aluminum extrusion or an NEV battery tray deflects under its own weight; a machine that is too short forces multi-setup flip-machining, which breaks datum continuity and accumulates tolerance stack-up. The gantry architecture — with the workpiece fixed and the spindle bridge traveling overhead — solves this by providing:
- Single-setup long-part capability. A 2.7 m or 3.7 m X-axis means a battery tray or rail extrusion machines in one fixturing, one datum, one tolerance stack.
- Symmetric thermal behavior. The gantry bridge travels equidistant from the column bases, so thermal growth is symmetric rather than cantilevered — critical for long-stroke accuracy.
- Full-closed-loop optical grating. All Gree long-stroke gantry models use optical-scale feedback, not just rotary-encoder semi-closed-loop. Over 3.7 m, this is the difference between holding position and drifting.
The competitive gap. Mainstream VMC and gantry competitors — including several well-known Japanese and German brands — typically cap standard gantry X-axis at 2,000 mm. Beyond that, buyers are pushed into custom-engineered specials with long lead times and premium pricing. Gree's off-the-shelf family starts at 2,700 mm, filling the gap between "standard" and "special" with a production-grade machine.
The gantry family at a glance
| Model | X-axis | Y-axis | Spindle | Architecture | Best-fit application |
|---|---|---|---|---|---|
| GA-GF2755 | 2,700 mm | 550 mm | 20,000 rpm | Direct-drive, twin-spindle sync | NEV battery trays, aluminum profiles, long thin-wall parts |
| GA-GF3755 | 3,700 mm | 550 mm | 20,000 rpm | Long-stroke profile gantry | Extra-long extrusions, rail structural members |
| GA-GF3766 | 3,700 mm | 660 mm | 20,000 rpm | Wider long-stroke gantry | Larger-format parts needing more Y clearance |
| GA-GF4028 | 4,000 mm | 2,800 mm | Two-speed gearhead | Fixed-beam, monolithic cast iron | Aerospace, rail transit, shipbuilding, heavy molds |
| GA-FMB3020D | 3,000 mm | 2,000 mm | High-speed, dual 5-axis | Twin five-axis, linear-motor drive | NEV floor pans, front compartments, die-cast structural parts |
GF2755 specs from Gree published materials and benchmark sheet. GF3755/3766 specs confirmed via factory nameplate (August 2026). GF4028 and FMB3020D from Gree Intelligent Equipment product catalog.
GA-GF2755 — The direct-drive long-stroke workhorse
GA-GF2755
Direct-drive Twin-spindle sync X = 2,700 mm · Y = 550 mmThe entry point to Gree's long-stroke family — and arguably the model with the sharpest competitive positioning. At 2.7 m X-axis, it handles the majority of NEV battery trays, side rails, and structural aluminum profiles that mainstream 2 m gantry machines cannot fit in a single setup.
2,700 mm
X-axis travel
20,000 rpm
Max spindle speed
80 m/min
X-axis rapid traverse
≤ 2.5 s
ATC tool change
- Linear direct-drive + optical grating full-closed loop. Fast response, high accuracy — and critically, accuracy maintained across the full 2.7 m stroke, not just the center.
- Twin-spindle synchronous operation. Two spindles machine in parallel, effectively doubling throughput on mirror-symmetric parts. Automated loading/unloading supported.
- Mehanite or granite castings. Premium castings for stable rigidity and thermal behavior — essential when the bed is 3+ meters long.
- Applications: precision aluminum-alloy parts, multi-hole long-stroke thin-wall workpieces, NEV battery trays, structural profiles.
GA-GF3755 / GA-GF3766 — Extra-long-stroke profile gantry
When 2.7 m is not enough — rail transit extrusions, wind turbine components, or extra-long structural members — the GF3755 and GF3766 extend the X-axis to 3,700 mm on the same architectural platform. These models were observed on the Gree factory floor in August 2026, with nameplate-confirmed specifications:
GA-GF3755
Factory-verified X = 3,700 mm · Y = 550 mm3,700 mm
X-axis travel
20,000 rpm
Spindle speed
70 m/min
Rapid traverse
30 m/min
Feed rate
7.5 m/s²
Acceleration
20 tools
ATC capacity
5 years
Warranty
Nameplate-confirmed on the factory floor (August 2026). The 5-year warranty is notable — it signals Gree's confidence in the structural longevity of the long-stroke platform. Rapid traverse is 70 m/min (vs. 80 m/min on the shorter GF2755), reflecting the trade-off between stroke length and maximum axis speed.
GA-GF3766
Factory-verified X = 3,700 mm · Y = 660 mmThe wider sibling of the GF3755 — same 3.7 m X-axis, but Y-axis expanded from 550 mm to 660 mm for parts that need more cross-rail clearance. The naming convention decodes cleanly: "37" = X 3,700 mm, "66" = Y 660 mm.
GA-GF4028 — Fixed-beam heavy-duty gantry
GA-GF4028
Heavy-duty Monolithic cast iron Fixed-beam architectureA different animal from the GF2755/3755/3766 family. Where those are traveling-beam profile gantries optimized for speed and aluminum, the GF4028 is a fixed-beam machine with a monolithic cast-iron gantry — designed for maximum rigidity in heavy-duty cutting of steel, cast iron, and large molds.
- Monolithic cast-iron fixed-beam gantry with FEA-optimized structure — the beam does not travel, eliminating a degree of freedom and maximizing static stiffness.
- Two-speed gearhead spindle for full-process adaptability — low-range torque for heavy roughing, high-range speed for finishing.
- 24-tool ATC for continuous heavy machining without magazine changes mid-cycle.
- Thermal design + error compensation on core components.
- Applications: aerospace structural members, rail transit components, shipbuilding, heavy-duty molds, heavy machinery.
GA-FMB3020D — Twin five-axis gantry
GA-FMB3020D
5-axis Linear motor Geneva 2025 Gold MedalThe flagship of Gree's gantry line — a dual five-axis gantry with synchronized linear-motor direct drive on both X and Y axes. Designed for large die-cast structural parts (NEV floor pans, front compartments, battery trays) that need five-axis access across a big envelope.
3,000 mm
X-axis travel
2,000 mm
Y-axis travel
+25%
Efficiency vs. conventional
- High-bridge gantry with one-piece cast beam — rigid yet lightweight for dynamic response.
- Synchronized X/Y large-thrust linear-motor direct drive — no ball-screw backlash, no lag, efficiency +25% vs. conventional drive (vendor-stated; internal benchmark).
- Concealed dual-tool-magazine design for large tool capacity without obstructing the work zone.
- Geneva International Invention Gold Medal (2025) — recognized innovation award.
- Applications: NEV floor pans, front compartment structures, battery-tray die-cast parts, large aluminum structural castings.
Efficiency claim transparency. The "+25% efficiency" figure is vendor-stated, based on internal benchmarking against conventional (ball-screw-driven) dual-gantry machines. The earlier "+80%" figure seen in Chinese domestic media is not used here — it was based on a different comparison baseline and could not be reliably replicated in overseas field conditions. We use the conservative +25% figure for all international communications.
Applications by part family
| Part family | Recommended model(s) | Why this model |
|---|---|---|
| NEV battery trays | GF2755, FMB3020D | 2.7 m X-axis fits most tray designs in one setup; five-axis option for complex pocket geometry |
| Aluminum structural profiles | GF2755, GF3755, GF3766 | Long extrusions need full-length single-setup machining; twin-spindle sync doubles throughput on symmetric profiles |
| Rail transit components | GF3755, GF3766, GF4028 | 3.7 m X-axis for rail structural members; fixed-beam option for steel work |
| Aerospace structurals | GF4028 | Monolithic cast-iron rigidity for titanium / steel airframe components |
| NEV floor pans / die-cast structurals | FMB3020D | Twin five-axis covers large die-cast parts with complex geometry in one setup |
| Heavy molds | GF4028 | Fixed-beam stability + 24-tool ATC for continuous heavy roughing and finishing |
How Gree's gantry family compares
| Dimension | Typical competitor gantry | Gree gantry family |
|---|---|---|
| X-axis stroke (standard range) | Up to ~2,000 mm | 2,700 – 3,700 mm (off-the-shelf) |
| Spindle speed | 8,000 – 15,000 rpm typical | 20,000 rpm across the profile gantry line |
| Feedback system | Rotary encoder (semi-closed) common | Optical grating full-closed loop standard on long-stroke models |
| Twin-spindle option | Rare or custom-engineered | Standard on GF2755 (synchronous operation) |
| Five-axis gantry | Premium tier, long lead time | FMB3020D — production model, Geneva Gold Medal |
| Warranty | 1–2 years typical | 5 years (GF3755, nameplate-confirmed) |
Competitor specs are general industry figures, not a specific brand comparison. Buyers should request quotes from specific vendors for apples-to-apples configuration matching.
Factory evidence — not just catalog specs
In August 2026, the Gree gantry family was observed in production on the factory floor. The GA-GF3755 and GA-GF3766 were photographed alongside the GA-MVD255 (a double-column VMC, currently being classified). Nameplate specifications on the GF3755 were directly readable and match the published catalog figures:
Honest limitations
- GF3755 / GF3766 full datasheets pending. The Z-axis travel, maximum workpiece weight, and complete positioning-accuracy figures are not yet in the published catalog. Factory nameplate confirms the headline specs above, but request the full datasheet before quoting.
- ISO 230-2 / VDI 3441 test reports not yet public. Gree has not published standardized positioning-and-repeatability test reports for the gantry family. Request these for any model you intend to buy — especially for the 3.7 m stroke models, where accuracy claims across the full stroke need independent verification.
- Overseas service network still building. Gree established EU and NA presence from ~2022, but the service depth for a 3.7 m gantry (spare-parts inventory, on-site engineer response time) is younger than for smaller VMC models. Confirm regional support in writing.
- Efficiency claim context. The FMB3020D "+25% efficiency" is a vendor internal benchmark vs. conventional drive, not an independent third-party test. The domestic-media "+80%" figure is not used internationally (see note above).
How to specify the right gantry model
- Measure your longest part. If it fits in 2.7 m, the GF2755 is the most cost-effective choice with the highest axis speed (80 m/min). If you need 3.7 m, step up to the GF3755 (or GF3766 for wider Y).
- Check part weight vs. table capacity. Long aluminum profiles are light for their length; steel aerospace parts are not. The GF4028 fixed-beam is built for heavy work; the profile gantries are optimized for aluminum.
- Determine if you need five-axis. Battery trays with flat-pocket geometry are fine in 3-axis or 3+2. Die-cast floor pans with complex surfaces need the FMB3020D's simultaneous five-axis.
- Request a trial part. Send your longest, most demanding part drawing. Ask for the CMM report from the trial — not a verbal pass.
- Ask for the full datasheet and ISO 230-2 report for the specific model quoted.
- Confirm service coverage — spare-parts lead time and on-site response for your region.
Frequently asked questions
What is the maximum X-axis stroke available in Gree's gantry family?
The GA-GF3755 and GA-GF3766 offer X-axis strokes of 3,700 mm (3.7 m). The GA-GF2755 offers 2,700 mm (2.7 m). For comparison, most mainstream competitor gantry machines cap at around 2,000 mm. The GA-GF4028 fixed-beam gantry extends to 4,000 mm X-axis for heavy-duty applications.
Which Gree gantry is best for NEV battery tray machining?
The GA-GF2755 (X = 2.7 m, 20,000 rpm, twin-spindle sync) covers most battery tray designs in a single setup. For trays with complex pocket geometry requiring five-axis access, the GA-FMB3020D twin five-axis gantry is the premium choice. For extra-long trays exceeding 2.7 m, step up to the GF3755 (X = 3.7 m).
Are the GF3755 and GF3766 production models or prototypes?
Both were observed on the Gree factory floor in August 2026 with finished nameplates, tooling, and 5-year warranty documentation — indicating production models, not prototypes. Full published datasheets are still being finalized; request them directly for complete specifications.
What is the difference between the GA-GF2755 and GA-GF3755?
The GF2755 has a 2,700 mm X-axis and is optimized for speed (80 m/min rapid traverse, twin-spindle sync). The GF3755 has a 3,700 mm X-axis for longer parts, with slightly lower rapid traverse (70 m/min) reflecting the trade-off between stroke length and maximum axis speed. Both share the 20,000 rpm spindle and optical-grating full-closed-loop control.
Does Gree offer a five-axis gantry for large parts?
Yes — the GA-FMB3020D is a twin five-axis gantry with synchronized linear-motor direct drive on both X and Y axes. It won the Geneva International Invention Gold Medal in 2025. It is designed for large NEV die-cast structural parts (floor pans, front compartments, battery trays) that need simultaneous five-axis machining across a 3,000 × 2,000 mm envelope.
Can I trust the accuracy across a 3.7 m stroke?
All Gree long-stroke gantry models use optical-grating full-closed-loop feedback, which is the correct technology for maintaining accuracy over long strokes. However, Gree has not yet published ISO 230-2 or VDI 3441 standardized test reports for these models. Request the test report for the specific model and stroke length before purchasing, and run a paid trial part to verify.
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