| Model | Unit | FGM400 |
| CNC system | Siemens 840D sl | |
| Min root circle diameter | mm | Φ30 (1.2”) |
| Max tip circle diameter (internal) | mm | Φ320 (13”) |
| Max tip circle diameter (external) | mm | Φ400 (16”) |
| Workpiece normal module | mm | 1-10 |
| No. of teeth | 1-300 | |
| Max helix angle | degree | ±45 |
| Max workpiece weight | kg | 80 |
| Axial moving axis of front worktable along workpiece (Z axis) | mm | 650 (26”) |
| Radial feeding axis of column along workpiece (X axis) | mm | 300 (12”) |
| Distance between headstock center and tailstock center | mm | 900 (35”) |
| Feed travel of worktable | mm | 650 (26”) |
| Speed of grinding wheel | rpm | 3000-6000 |
| Max power of grinding apparatus | kW | 11.5 |
Features of FGM400 CNC Gear Form Grinding Machine
1. FGM400 CNC gear form grinding machine is a precision metal-cutting machine, which is suitable for grinding high precision gears. The principle used is form grinding, i.e. the section profile of grinding wheel is dressed to engage with tooth space well, so form grinding can be carried out.
2. Movements and operations of the machine are simple; it employs deep-cutting with slow-feeding mode to grind and is characterized by high machining accuracy, high efficiency, excellent reliability, good stability, high automation, various machining objects, and flexible gear modification. The machine employs horizontal structure with 4 axes of 3 axes in synchronization. High precision rolling needle type linear guideway is used on linear moving axis, which makes the machine have high rigidity and accuracy.
3. FGM400 employs Siemens 840D CNC system, servo system and driving system. Torque motor of Siemens is also adopted on the workpiece axis to eliminate backlash entirely.
4. The grinding spindle employs 1FE1 built-in synchronous motor, internal and external gear grinding adopts the same motor; max motor power is 11.5kW. Form dressing employs work spindle without respective dressing spindle.
5. Except the time for indexing and dressing grinding wheel, the other working time is effective time. Form gear grinding enlarges the grinding contact area between section shape of grinding wheel and gear, increase grinding amount in unit time, which improves grinding efficiency.
6. As for the software, we developed program package featuring the functions of grinding calculation, parameterized interface, common database of gears, random measurement, etc.
1. FGM400 CNC gear form grinding machine is a precision metal-cutting machine, which is suitable for grinding high precision gears. The principle used is form grinding, i.e. the section profile of grinding wheel is dressed to engage with tooth space well, so form grinding can be carried out.
2. Movements and operations of the machine are simple; it employs deep-cutting with slow-feeding mode to grind and is characterized by high machining accuracy, high efficiency, excellent reliability, good stability, high automation, various machining objects, and flexible gear modification. The machine employs horizontal structure with 4 axes of 3 axes in synchronization. High precision rolling needle type linear guideway is used on linear moving axis, which makes the machine have high rigidity and accuracy.
3. FGM400 employs Siemens 840D CNC system, servo system and driving system. Torque motor of Siemens is also adopted on the workpiece axis to eliminate backlash entirely.
4. The grinding spindle employs 1FE1 built-in synchronous motor, internal and external gear grinding adopts the same motor; max motor power is 11.5kW. Form dressing employs work spindle without respective dressing spindle.
5. Except the time for indexing and dressing grinding wheel, the other working time is effective time. Form gear grinding enlarges the grinding contact area between section shape of grinding wheel and gear, increase grinding amount in unit time, which improves grinding efficiency.
6. As for the software, we developed program package featuring the functions of grinding calculation, parameterized interface, common database of gears, random measurement, etc.
| Model | Unit | FGM400 |
| CNC system | Siemens 840D sl | |
| Min root circle diameter | mm | Φ30 (1.2”) |
| Max tip circle diameter (internal) | mm | Φ320 (13”) |
| Max tip circle diameter (external) | mm | Φ400 (16”) |
| Workpiece normal module | mm | 1-10 |
| No. of teeth | 1-300 | |
| Max helix angle | degree | ±45 |
| Max workpiece weight | kg | 80 |
| Axial moving axis of front worktable along workpiece (Z axis) | mm | 650 (26”) |
| Radial feeding axis of column along workpiece (X axis) | mm | 300 (12”) |
| Distance between headstock center and tailstock center | mm | 900 (35”) |
| Feed travel of worktable | mm | 650 (26”) |
| Speed of grinding wheel | rpm | 3000-6000 |
| Max power of grinding apparatus | kW | 11.5 |
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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