Gantry Type Milling Machines
Product Details
The GFC-3850R keeps the gantry frame fixed while the worktable moves along the X axis. Its main castings are made from high-strength cast iron, with reinforcing ribs designed according to structural analysis. The large castings are produced using resin-sand molding and undergo heat treatment to relieve residual stress. This layout is intended for machining large parts where the workpiece stays on the table while the spindle moves across the required machining area. For customers searching for a gantry type milling machines for large-format metalworking, it is important to note that the GFC-3850R is a milling and machining center rather than a turning machine.
The spindle head uses a 500 × 500 mm fully enclosed square ram. The servo spindle motor and gear head are arranged inside the ram structure, and the gear head is connected to the spindle through internal gearing. The spindle and gear head have an independent oil-cooling system to carry away generated heat and reduce heat transfer to the ram.
The machine uses three X-axis heavy-duty roller guideways, two Y-axis heavy-duty roller guideways and a 500 × 500 mm enclosed square ram for the Z axis. X, Y and Z are driven by large-lead precision ball screws, while the Z axis uses a nitrogen-cylinder balancing system to compensate for the ram's weight.
Product Parameters
|
Item |
Specification |
|
Model |
GFC-3850R Gantry Type Milling Machines |
|
Machine Type |
Fixed Beam, Moving Table Gantry Machining Center |
|
Spindle Head |
Built-in WEMAS Gear Head |
|
CNC System |
SIEMENS 828D |
|
Worktable Size |
3200 × 5000 mm |
|
Maximum Table Load |
35 t |
|
T-Slot Width × Pitch |
28 × 250 mm |
|
Distance Between Columns |
3800 mm |
|
Spindle Nose to Table |
300–1800 mm |
|
X / Y / Z Axis Travel |
8020 / 4400 / 1500 mm |
|
X / Y / Z Rapid Traverse |
6 / 8 / 6 m/min |
|
Cutting Feed Rate |
1–6000 mm/min |
|
Spindle Drive |
Built-in WEMAS Gear Head |
|
Spindle Taper |
BT50 |
|
Spindle Speed Range |
20–6000 rpm |
|
Spindle Power |
22–28 kW |
|
Spindle Torque |
620 / 761 N·m |
|
X-Axis Guideway |
3 × 55 Heavy-Duty Roller Guideways |
|
Y-Axis Guideway |
2 × 55 Heavy-Duty Roller Guideways |
|
Z-Axis Ram |
500 × 500 mm Fully Enclosed Square Ram |
|
X / Y / Z Ball Screw |
8020 / 8020 / 6320 |
|
X-Axis Positioning Accuracy |
0.030 mm |
|
Y-Axis Positioning Accuracy |
0.025 mm |
|
Z-Axis Positioning Accuracy |
0.028 mm |
|
X-Axis Repeatability |
0.022 mm |
|
Y-Axis Repeatability |
0.020 mm |
|
Z-Axis Repeatability |
0.015 mm |
|
Electrical Requirement |
70 kVA |
|
Working Air Pressure |
6–8 kg/cm² |
|
Approx. Floor Space |
13.5 × 6.8 × 6.6 m |
The positioning and repeatability values are specified according to GB/T 19362.1-2003.
Product Features
1. 8-Meter-Class X-Axis Travel
With an 8020 mm X-axis travel, the machine is configured for workpieces that are considerably longer than those handled by conventional medium-size machining centers. The 5000 mm table length also provides a substantial loading surface for large components.
2. Built-in WEMAS Gear Head
The spindle head uses an embedded WEMAS gear head with a 1:4.426 transmission ratio. The gear head is integrated into the ram structure rather than mounted as a separate external attachment.
3. 500 × 500 mm Enclosed Square Ram
The Z-axis ram uses a 500 × 500 mm fully enclosed square structure. Its long guiding surfaces support the ram when it extends for machining and provide the structural support required for the large Z-axis assembly.
4. Three X-Axis Guideways
The X axis uses three 55-size heavy-duty roller guideways, while the Y axis uses two. The arrangement is designed around the machine's long worktable travel and heavy workpiece loading requirements.
5. Nitrogen Balance for the Z Axis
The Z-axis ram is balanced with a nitrogen cylinder. The balancing system reduces the unbalanced torque caused by the ram's own weight and helps reduce idle load and wear on the ball screw.
6. Automatic Lubrication
The guideways, ball screws, gear head and other moving components use a centralized automatic lubrication system. It provides measured lubrication and includes protection against insufficient oil and pressure loss.
Product Advantages
The main practical difference of the GFC-3850R gantry type milling machines is its working envelope and loading capacity. An 8020 mm X-axis travel combined with a 35-ton worktable allows large components to be machined without repeatedly repositioning or transferring them to another machine. This is particularly useful when several surfaces or features need to be reached along the length of one workpiece.
The spindle configuration also fits heavy machining work. The BT50 spindle operates from 20 to 6000 rpm, with 22–28 kW power and 620 / 761 N·m rated and maximum torque. The built-in gear head provides the speed and torque transmission needed for different milling conditions rather than relying only on a high-speed spindle.
For buyers using the term gantry type milling machines, the machining method should be checked carefully before equipment selection. The GFC-3850R performs milling-based operations and is intended for parts requiring milling, boring, drilling, rigid tapping, reaming and countersinking rather than conventional turning.
Another consideration is the combination of the 500 × 500 mm ram, nitrogen balance and three X-axis guideways. These elements are configured around the machine's long travel and heavy structural load rather than simply increasing the table size.
Product Applications
The GFC-3850R is intended for large components that require a combination of machining operations on one machine.
General and Construction Machinery
Suitable for large machine bases, frames, structural parts, brackets and other heavy components.
Power and Energy Equipment
Used for large equipment housings, bases and structural components.
Automotive Manufacturing
Suitable for large production tooling, structural parts and other components requiring extensive machining travel.
Mold Processing
The large X/Y working range can be used for large mold bases and mold structures.
Civil Aviation
Applicable to large aircraft structural components and related machining work.
Shipbuilding
The long X-axis travel and high table capacity are suitable for large marine structural and mechanical components.
Rail Transportation
Can be used for long frames, structural components and large mechanical parts used in rail equipment.
These application areas are consistent with the technical contract, which lists general and construction machinery, automotive manufacturing, power and energy equipment, mold processing, civil aviation, shipbuilding and rail transportation.
Customization Options
The GFC-3850R gantry type milling machines can be configured around the customer's workpiece dimensions, machining process and workshop conditions.
Foundation
Two installation arrangements can be considered:
- Standard foundation
- Sunken foundation
The foundation must be prepared according to the manufacturer's foundation drawing to maintain the machine's installation accuracy.
Machining Head
The built-in WEMAS gear head is the specified spindle-head configuration for this model. Additional machining-head requirements can be discussed according to the workpiece and required machining angles.
CNC System
The standard CNC system is SIEMENS 828D. The system supports functions such as linear, circular and helical interpolation, rigid tapping, tool compensation, spindle positioning, DNC machining and other CNC machining functions.
Workshop Configuration
Before installation, the customer needs to prepare suitable electrical power, compressed air, foundation and lifting equipment. The technical document specifies 0.6–0.8 MPa compressed air, with clean and dry air required for machine operation.
FAQ
1. What guideways are used?
The X axis uses 3 × 55 heavy-duty roller guideways, and the Y axis uses 2 × 55 heavy-duty roller guideways. The Z axis uses a 500 × 500 mm fully enclosed square ram.
2. Can the machine perform drilling and tapping?
Yes. The specified machining processes include milling, boring, drilling, rigid tapping, reaming and countersinking.
3. Is installation support included?
Yes. The manufacturer provides on-site inspection, installation, commissioning and acceptance support after the machine is delivered to the customer's factory.
4. How long is the warranty?
The warranty period is 12 months from final acceptance. Online technical support continues after the warranty period.
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