| Items | BF40 |
| Capacity | |
| Max. Swing over bed | Φ400 mm |
| Max. turning diameter | Φ400 mm |
| Max. Swing over slide | Φ200 mm |
| Distance between centers | 750 mm / 1000 mm |
| Max. turning length | 580 mm/ 830 mm |
| Spindle | |
| Spindle bore | Φ57 mm |
| Spindle nose | A2-6 |
| Spindle speed | 140-3000 rpm |
| Step of spindle speed | stepless |
| Spindle motor power | 5.5 kW (inverter) |
| Chuck | Φ200 mm |
| Travel and rapid traverse | |
| X axis travel | 200 mm |
| Z axis travel | 590 mm/ 840mm |
| X axis rapid traverse speed | 6 m/min |
| Z axis rapid traverse speed | 8 m/min |
| Tailstock | |
| Tailstock sleeve diameter | Φ65 mm |
| Tailstock sleeve travel | 120 mm |
| Tailstock sleeve taper | MT4 mm |
| Turret | |
| Number of tool station | 4 |
| Tool cross section | 20x20 mm |
| Accuracy | |
| Position accuracy | X:0.024 mm; Z:0.032 mm |
| Repeatability accuracy | X:0.010 mm; Z:0.013 mm |
| Others | |
| Power source | 12 kVA |
| Net weight | 1700 kg/ 2100 kg |
| Overall dimension (L×W×H) | 750mm: 2150 ×1260×1600 mm 1000mm: 2400 ×1260×1600 mm |
| Item 01 | Descriptions | |
| 01.01 | FANUC Oi TF | |
| 01.02 | X/Z axis servo motor | |
| 01.03 | Inverter spindle motor | |
| 01.04 | 3-jaw manual chuck 200mm | |
| 01.05 | Manual tailstock | |
| 01.06 | 4-station electric tool post | |
| 01.07 | Coolant system | |
| 01.08 | Automatic lubrication system | |
| 01.09 | Working light | |
| 01.10 | Installation damping pads |
| Item 02 | Descriptions | |
| 02.01 | GSK980TDI or SIEMENS CNC system | |
| 02.02 | CTB servo spindle motor | |
| 02.03 | 3-jaw hollow hydraulic chuck（8 inch） | |
| 04.04 | 3-jaw solid hydraulic chuck（8 inch） | |
| 02.05 | 6-station electric tool post | |
| 02.06 | Hydraulic tailstock |
Features
This is a CNC lathe controlled by FANUC Oi TF or GSK980TD system and with 2-controllable axes. Operations of internal and external turning, taper turning, circular surface turning, inch and metric threading are performed. The lathe features a 4-station turret to satisfy different cutting requirement, a sliding door and a variety of caution plates to guarantee safety for operators. It is applicable to batch production of multi-specification work, especially precision work in complex contours.
This is a CNC lathe controlled by FANUC Oi TF or GSK980TD system and with 2-controllable axes. Operations of internal and external turning, taper turning, circular surface turning, inch and metric threading are performed. The lathe features a 4-station turret to satisfy different cutting requirement, a sliding door and a variety of caution plates to guarantee safety for operators. It is applicable to batch production of multi-specification work, especially precision work in complex contours.
| Item 01 | Descriptions | |
| 01.01 | FANUC Oi TF | |
| 01.02 | X/Z axis servo motor | |
| 01.03 | Inverter spindle motor | |
| 01.04 | 3-jaw manual chuck 200mm | |
| 01.05 | Manual tailstock | |
| 01.06 | 4-station electric tool post | |
| 01.07 | Coolant system | |
| 01.08 | Automatic lubrication system | |
| 01.09 | Working light | |
| 01.10 | Installation damping pads |
| Item 02 | Descriptions | |
| 02.01 | GSK980TDI or SIEMENS CNC system | |
| 02.02 | CTB servo spindle motor | |
| 02.03 | 3-jaw hollow hydraulic chuck（8 inch） | |
| 04.04 | 3-jaw solid hydraulic chuck（8 inch） | |
| 02.05 | 6-station electric tool post | |
| 02.06 | Hydraulic tailstock |
Knee Type Milling Machine: Precision Versatility for Industrial Manufacturing
What is a Knee Type Milling Machine?
A knee type milling machine is a fundamental machine tool distinguished by its vertically adjustable worktable mounted on a "knee" casting. This knee moves precisely up and down a fixed column via a screw mechanism, enabling accurate Z-axis positioning crucial for diverse milling operations.
Working Principle
The core principle involves a rotating milling cutter removing material from a workpiece secured to the table. The adjustable knee mechanism allows controlled vertical movement (Z-axis), while the table provides longitudinal (X-axis) and transverse (Y-axis) travel. This 3-axis control facilitates complex machining of flat, angular, and contoured surfaces.
Key Applications
- Tool & Die Making: Precision molds, jigs, fixtures
- Prototyping: Rapid part development
- Maintenance Shops: Equipment repair & part fabrication
- General Machining: Slotting, drilling, facing, keyway cutting
- Aerospace & Automotive: Component manufacturing
Distinctive Features & Advantages
- Vertical Adjustability: Knee movement enables quick workpiece height changes
- Rigid Construction: Robust cast iron frame ensures stability
- Manual & CNC Options: Traditional control or computer numerical precision
- Turret Design (Common): Swiveling milling head for multi-angle machining
- Wide Workpiece Compatibility: Handles various sizes and shapes
Primary Classifications
- Vertical Knee Mill: Spindle axis perpendicular to table (most common)
- Horizontal Knee Mill: Spindle axis parallel to table (for heavy stock removal)
- Universal Knee Mill: Table swivels for complex angular cuts
- Turret Mill: Head rotates on turret for flexible positioning
Main Components
- Base & Column: Primary support structure
- Knee: Vertically moving saddle supporting the table
- Saddle & Table: Hold and position the workpiece (X/Y axes)
- Milling Head: Houses spindle, motor, and quill (Z-axis)
- Arbor/Spindle: Rotating shaft holding cutting tools
- Controls: Manual handwheels or CNC interface
Evolution & Industry Significance
Since their development in the late 19th century, knee-and-column mills revolutionized machining. The iconic Bridgeport design (1938) popularized the turret style. While CNC machining centers dominate high-volume production, knee mills remain indispensable for flexibility, ease of use, and cost-effectiveness in job shops, schools, and repair facilities worldwide.
Fortune Pacific: Your Knee Mill Solution
At Fortune Pacific, we engineer durable, high-precision knee type milling machines for demanding applications. Explore our range of vertical mills, horizontal mills, and CNC-ready models designed to enhance your workshop's capabilities. Discover the ideal machine for your metalworking, prototyping, or toolmaking needs.
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