Hyundai WIA KF7700B II Series
Key Specifications
X Travel
Y Travel
Z Travel
Max Spindle
Spindle Taper
Table Size
Overview
The Hyundai WIA KF7700B II Series is the largest machine in Hyundai WIA's second-generation bridge-type VMC lineup, providing a massive work envelope for shops machining the biggest parts that can still fit on a vertical machining center. With 1,500 mm X-travel, 770 mm Y-travel, and a table sized at 1,700 x 770 mm rated for 2,000 kg, the KF7700B II handles workpieces that most VMCs simply cannot accommodate.
The bridge-type double-column construction is critical at this machine size. Without the rigidity of dual-column support, a C-frame machine this large would suffer unacceptable column deflection during heavy cuts. The KF7700B II's bridge design maintains cutting accuracy and surface finish quality even during aggressive roughing operations with large-diameter face mills in steel and cast iron.
The BT50 spindle delivers 10,000 RPM with 37/30 kW (50/40 hp), providing serious cutting power for productive material removal on large workpieces. Box way guideways on all axes deliver the vibration damping essential for smooth surface finishes on heavy interrupted cuts. The 40-tool ATC handles BT50 toolholders with expansion options to 60 tools. Rapid traverse of 18 m/min (709 ipm) reflects the heavy-duty construction.
At $250,000-$350,000 new, the KF7700B II competes with large-format bridge-type VMCs from Okuma, Toshiba, and Kuraki. For shops that need maximum vertical machining capacity without moving to a horizontal boring mill, the KF7700B II provides a complete solution with FANUC control, BT50 power, and competitive Korean pricing. It is particularly well suited for mold/die applications, energy sector components, and heavy equipment manufacturing.
Full Specifications
| Parameter | Value |
|---|---|
| X-Axis Travel | 1,500 mm (59.1 in) |
| Y-Axis Travel | 770 mm (30.3 in) |
| Z-Axis Travel | 650 mm (25.6 in) |
| Table Size | mm |
| Table Load Max | 2,000 kg (4,409 lb) |
| Max Spindle Speed | 10,000 RPM |
| Spindle Taper | BT50 |
| Spindle Motor Power | kW |
| Spindle Drive | Belt drive |
| Atc Capacity | 40 tools (60 optional) |
| Atc Type | Servo-driven arm type |
| Rapid Traverse Rate | 18 m/min (709 ipm) |
| Guideway Type | Hardened and ground box ways |
| Positioning Accuracy | ±0.008 mm (±0.0003 in) |
| Repeatability | ±0.005 mm (±0.0002 in) |
| CNC Control | FANUC 0i-MF Plus |
| Machine Weight | 22,000 kg (48,502 lb) |
| Description | Unit |
| Max Load Capacity | kg |
| Spindle Rpm | r/min |
| Spindle Torque | N.m |
| Travel | mm |
| Rapid Feed Rate | m/min |
| No Of Tools | EA |
| Tool Change Time | sec |
| Type Of Business | Business Type 1VehiclesIT/ElectronicsMachinery/ShipbuildingComplex & Precise PartsDie&Mold IndustryEnergyOthersBusiness Type 2 |
| E Mail | @ |
Specifications sourced from wiamachine.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 1,500 x 770 mm travel envelope is the largest in the KF bridge-type family, handling workpieces that exceed most VMC capacities
- 2,000 kg table load accommodates heavy mold bases, large castings, and robust multi-fixture setups
- 37 kW (50 hp) BT50 spindle provides the power for aggressive roughing with large-diameter tooling in tough materials
- Bridge-type construction maintains rigidity and accuracy at this large format where C-frame machines would flex significantly
- 40-tool standard ATC (60 optional) handles the diverse tooling needs of complex large-format programs
- Competitive pricing versus comparable Japanese and European bridge-type VMCs in this size class
Limitations
- 22,000 kg machine weight requires heavy-duty foundation and substantial floor space commitment
- 18 m/min rapid traverse is slow — programs with many positioning moves across the 1,500 mm X-travel will add non-cutting time
- 10,000 RPM spindle speed is ferrous-material oriented — not the right choice for high-speed aluminum production
- Large capital investment at $250K-$350K requires strong utilization rates to justify the machine cost
Best For
Frequently Asked Questions
01
The KF7700B II provides 200 mm more X-travel (1,500 vs 1,300), 100 mm more Y-travel (770 vs 670), a larger table (1,700x770 vs 1,500x670 mm), higher table load (2,000 vs 1,500 kg), and more spindle power (50 vs 40 hp). It is the right choice when workpiece size or weight exceeds the KF6700B II capacity.
02
Choose the KF7700B II when your parts are best machined from the top (gravity assists chip clearance), when Z-depth requirements are under 650 mm, and when you do not need rotary B-axis capability for four-face machining in a single setup. A horizontal boring mill is better for tall parts requiring side access, deep boring operations, and four-face machining of box-type workpieces.
03
At 22,000 kg plus workpiece (up to 2,000 kg) and fixturing, the foundation must support approximately 25,000+ kg. A reinforced concrete foundation 400-600 mm thick with anchor bolt provisions per the Hyundai WIA foundation drawing is typical. Soil conditions and existing floor construction should be evaluated by a structural engineer.
04
Yes. A bolt-on rotary table can be mounted on the 1,700 x 770 mm table for 4th-axis indexed or continuous machining. The FANUC 0i-MF Plus supports 4th-axis interpolation. The large table accommodates sizable rotary units without sacrificing usable work envelope.
