Gantry 5 Axis
Product Details
The machine adopts an elevated bridge structure with a fixed worktable. Longitudinal saddles on the left and right beds support a box-in-box crossbeam, which moves along the X-axis together with the ram. The entire structure forms a closed rigid frame. Main components including the bed, worktable, left/right saddles, box-in-box crossbeam, transverse carriage, and milling ram are all cast from high-strength cast iron using resin-bonded sand molding, providing good vibration damping and thermal stability. The X and Y axes use dual-gear anti-backlash rack drives with hardened and ground racks on both sides of the bed, and two planetary reducers on each saddle - adjusting the dual gears eliminates backlash. Linear scales are installed on the inner sides of the left and right beds (X-axis), on the crossbeam (Y-axis), and on the ram (Z-axis) for full closed-loop control, ensuring synchronization of the dual drive motors on the X-axis. The Z axis uses a large-lead precision ballscrew with nitrogen cylinder counterbalance to offset the ram's self-weight. As a gantry 5 axis machine, rapid traverse rates reach 30/30/20 m/min, combining long travel with high efficiency.
Machine Specifications
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Item |
Unit |
Parameters |
Remarks |
|
Worktable |
|||
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Table size |
mm |
3000×8000 |
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Max. table load |
kg/m² |
8000 |
|
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T-slot width × pitch |
mm |
28×250 |
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Machining Range |
|||
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Distance between columns (clearance) |
mm |
4200 |
|
|
Spindle nose to table surface |
mm |
200-1700 |
|
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X/Y/Z axis travel |
mm |
8500/3000/1500 |
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|
Speed |
|||
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X/Y/Z axis rapid traverse |
m/min |
30/30/20 |
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Cutting feed rate |
m/min |
20 |
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AC Swivel Head (Torque Motor Direct Drive) |
|||
|
Brand |
- |
Mepro |
|
|
A/C axis max. swivel speed |
rpm |
60/60 |
|
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A/C axis max. torque |
N.m |
1060/1350 |
|
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A/C axis rated torque (S1-100%) |
N.m |
700/715 |
|
|
A/C axis braking torque |
N.m |
4000/4000 |
|
|
A/C axis positioning accuracy |
arc.sec |
8"/8" |
|
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A/C axis swivel range |
deg |
±110°/±360° |
A-axis: 5° more than conventional ±105° |
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Spindle |
|||
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Spindle taper |
- |
HSK-A100 |
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Spindle speed range |
rpm |
Rated 2580 / Max. 10000 |
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Spindle power (S1-100%) |
kW |
54 |
|
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Spindle torque (S1-100% / S6-40%) |
N.m |
200 / 240 |
|
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Drive & Guideway |
|||
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X/Y axis drive type |
- |
Alpha rack (dual-gear anti-backlash) |
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|
Z axis ballscrew spec. |
- |
6340 |
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|
X/Y/Z axis guideway type |
- |
4-55 heavy-duty roller guideways |
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|
Control System |
|||
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CNC system |
- |
Siemens SIEMENS ONE |
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Machine Accuracy (in accordance with GB/T33150-2016) |
|||
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Positioning accuracy (X/Y/Z) |
mm |
0.035/0.023/0.012 |
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Repeatability (X/Y/Z) |
mm |
0.028/0.018/0.01 |
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Others |
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Power supply requirement |
kVA |
150 |
|
|
Air pressure requirement |
Kg/cm² |
6-8 |
|
|
Floor space approx. (L×W×H) |
m |
13.5×7.8×6 |
|
Product Details
X-Axis Long Travel + Linear Scale Full Closed-Loop Control
X-axis travel is 8500mm with an 8000mm table, covering the entire table length for effective machining. Linear scales are mounted on the inner sides of the left and right beds (X-axis), on the crossbeam (Y-axis), and on the ram (Z-axis). Position signals feed back directly to the CNC system, monitoring actual displacement of both saddles in real time to ensure synchronization during dual-motor X-axis drive. Full closed-loop control measures actual table/ram position rather than relying solely on motor encoder feedback, compensating for thermal expansion and mechanical backlash of racks and ballscrews for higher positioning accuracy over long travels.
Z-Axis Nitrogen Counterbalance
The Z axis uses nitrogen cylinder counterbalance technology - nitrogen cylinders produce upward force to offset the ram and spindle head's self-weight. The ballscrew only handles dynamic loads during acceleration/deceleration, while static loads are carried by the nitrogen cylinders. Reduced no-load torque means less screw wear and better long-term accuracy retention. No lag issues seen with counterweights or hydraulic balance systems, with faster response.
Dual-Gear Anti-Backlash Rack Drive
The X and Y axes use dual-gear anti-backlash reduction drives. Each saddle mounts two planetary reducers, each with a hardened and ground output gear - both gears mesh with the same rack. The two gears are offset by half a tooth pitch during installation, with preload applied to eliminate backlash. No lost motion during reversal, no vibration or tool deflection during milling due to clearance.
A-Axis ±110° Swivel Range
The A-axis swivel range on this AC head is ±110°, offering 5° more than the common ±105° specification. The extra range is useful for aerospace structural parts where some sidewall chamfers or angles are right at the 105° edge - ±110° reaches them without repositioning the workpiece. For deep cavity molds, the additional 5° allows steeper tool approach to sidewall bottoms, reducing interference.
4 Guideways on All Axes
X, Y, and Z axes each feature 4 heavy-duty 55mm roller guideways. The X-axis has two on each side of the bed, the Y-axis has four evenly spaced on the crossbeam, and the Z-axis has one on each face of the ram. Four guideways provide wider load distribution, reduced individual slider loading, and smoother motion.
Spindle HSK-A100 + 10000rpm
HSK-A100 tool holder features dual-face contact for stable clamping force at high speeds, suitable for 10000rpm operation. Rated spindle power is 54kW with torque of 200/240N.m. The 10000rpm top speed enables efficient machining of aluminum and composite materials, while lower speeds handle steel roughing.
Applications
- Aerospace Aluminum Stringers & Panels: Aircraft fuselage panels and wing panels often exceed 6 meters in length with 2-3 meter widths. The 3000×8000mm table accommodates full-length panels without sectional machining. As a gantry 5 axis machine, one setup handles both internal and external profiles, pocketing, and lightening holes. The A-axis ±110° reaches edge chamfers and seal grooves without secondary angle adjustments. The 8500mm X-axis travel covers full panel length, and linear scale full closed-loop control ensures positioning accuracy does not degrade over long travel.
- Large Automotive Panel Molds: Side panels, roof panels, door panels, and other stamping dies often exceed 3×5 meters in size. 5-axis simultaneous operation allows side-edge cutting instead of ball-nose point cutting, improving surface quality. 1500mm Z-axis travel plus ±110° A-axis swivel handles deep cavities and near-vertical sidewalls.
- Wind Turbine Blade Molds & Tooling: Blade molds are long and narrow - often exceeding 8 meters in length - and the 3000×8000mm table is a perfect fit. Mold surfaces are complex and require 5-axis contour milling. This gantry 5 axis configuration with long X-axis travel and 5-axis capability is particularly well-suited for long, curved workpieces like wind turbine blade molds.
- Rail Transit Large Components: High-speed rail underframes, bogie frames, and other welded structures 6-8 meters in length require milling of mounting surfaces and drilling. The 8500mm X-axis travel covers full workpiece length, completing all operations in a single setup.
FAQ
1. What is the actual advantage of ±110° A-axis over ±105° in production?
The extra 5° helps in two specific scenarios: First, aerospace aluminum structural parts sometimes use 108°-110° chamfers or sidewall angles - ±105° can't reach without repositioning the workpiece or using an angle head, while ±110° handles them directly. Second, for deep cavity molds, the additional 5° allows the tool axis to approach sidewalls more steeply, reducing interference risk - especially when using short tool holders and large-diameter tools where clearance is tight.
2. What's the difference between linear scale full closed-loop and semi-closed-loop control?
Semi-closed-loop control relies only on the motor encoder to count rotations and indirectly calculate table/ram position. But ballscrews and racks have thermal expansion and mechanical backlash - calculated position and actual position may differ. Linear scales directly measure physical position of the table or ram, feeding actual data back to the system. The system compares commanded vs. actual position and applies corrections in real time. The benefit is more significant on long-travel machines - when bed temperature changes cause rack thermal expansion, the linear scale compensates directly.
3. Why is X-axis travel 8500mm when the table is 8000mm? Why the extra 500mm?
The extra 500mm provides clearance for the tool and spindle head. When machining workpiece edges, the spindle centerline needs to move beyond the workpiece edge so the tool can fully cut the edge. Also, tool changes require the spindle to move to a tool change position, often outside the table area. The 8500mm travel ensures the spindle can reach approximately 250mm beyond each end of the table for edge machining and tool change operations.
4. How long does installation and commissioning take?
The machine is shipped in sections. Customer handles unloading and initial placement per manufacturer guidance. Manufacturer dispatches installation engineers for machine assembly, leveling, spliced guideway alignment calibration, linear scale installation and adjustment, system commissioning, and test cutting. Installation and commissioning takes approximately 15-20 working days (depending on site conditions and machine length). Foundation work must be completed before delivery, with concrete curing for at least 28 days.
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