| Model | Unit | FGM320 |
| Type | A | |
| CNC system | NUM1050 | |
| Workpiece outer diameter | mm | Φ30-320 (1.2-13”) |
| Workpiece normal module | mm | 10 |
| No. of teeth | Unlimited | |
| Max teeth width | mm | 600 (24”) |
| Max helix angle | degree | ±45 |
| Max workpiece weight | kg | 80 |
| Periphery speed of grinding wheel | m/s | 30-50 |
| Max movement speed of grinding head | m/min | 10 |
| Max feed speed of grinding head | m/min | 6 |
| Max travel for movement of grinding head | mm | 1000 |
| Max travel for feed of grinding head | mm | 250 |
Applications of FGM320 A CNC Gear Form Grinding Machine
FGM320 A CNC Gear Form Grinding Machine is designed for grinding precision gears with diameter less than 320mm and special gears for industries of automotive, aviation and machine tool in batches. It is especially suitable for grinding high speed gears and multiple gears with special profile modification or transition part of crest and roots. Besides, it can grind non-involute profile like cycloidal gear, oil pump rotor, precision spline and screw.
Features of FGM320 A CNC Gear Form Grinding Machine
1. NUM1050 CNC system is adopted on FGM320 A CNC Gear Form Grinding Machine. There are 4 servo axes: feed axis X of grinding head; movement axis Z of grinding head, rotary axis A of grinding head and indexing axis C. Axes X, Z and C are full-closed loop control; axis A is semi-closed loop control. Imported linear roller guideways with high precision and rigidity are used for linear axes X and Z. Precision combined bearings are adopted for rotary axis A to guarantee accurate positioning for helix angle of the grinding head and high rigidity. A dual-worm anti-backlash mechanism is employed for indexing axis C to reach precision indexing requirement.
2. A motorized spindle motor with speed up to 18000 rpm is used for the grinding head, which meets the linear speed need for small grinding wheels and high speed wheel.
3. Based on the data file created with form profile dressing software according to the grinding requirement, the profile dressing of wheel is carried out with a diamond roller through interpolation motion of axes X and Z.
4. The grinding cycle is controlled with CNC system; wheel dressing, compensating and automatic grinding cycle are completed with once programming.
5. A fully enclosed cover, cooling pump with big flow and constant temperature refrigeration device are equipped.
1. NUM1050 CNC system is adopted on FGM320 A CNC Gear Form Grinding Machine. There are 4 servo axes: feed axis X of grinding head; movement axis Z of grinding head, rotary axis A of grinding head and indexing axis C. Axes X, Z and C are full-closed loop control; axis A is semi-closed loop control. Imported linear roller guideways with high precision and rigidity are used for linear axes X and Z. Precision combined bearings are adopted for rotary axis A to guarantee accurate positioning for helix angle of the grinding head and high rigidity. A dual-worm anti-backlash mechanism is employed for indexing axis C to reach precision indexing requirement.
2. A motorized spindle motor with speed up to 18000 rpm is used for the grinding head, which meets the linear speed need for small grinding wheels and high speed wheel.
3. Based on the data file created with form profile dressing software according to the grinding requirement, the profile dressing of wheel is carried out with a diamond roller through interpolation motion of axes X and Z.
4. The grinding cycle is controlled with CNC system; wheel dressing, compensating and automatic grinding cycle are completed with once programming.
5. A fully enclosed cover, cooling pump with big flow and constant temperature refrigeration device are equipped.
| Model | Unit | FGM320 |
| Type | A | |
| CNC system | NUM1050 | |
| Workpiece outer diameter | mm | Φ30-320 (1.2-13”) |
| Workpiece normal module | mm | 10 |
| No. of teeth | Unlimited | |
| Max teeth width | mm | 600 (24”) |
| Max helix angle | degree | ±45 |
| Max workpiece weight | kg | 80 |
| Periphery speed of grinding wheel | m/s | 30-50 |
| Max movement speed of grinding head | m/min | 10 |
| Max feed speed of grinding head | m/min | 6 |
| Max travel for movement of grinding head | mm | 1000 |
| Max travel for feed of grinding head | mm | 250 |
FGM320 A CNC Gear Form Grinding Machine is designed for grinding precision gears with diameter less than 320mm and special gears for industries of automotive, aviation and machine tool in batches. It is especially suitable for grinding high speed gears and multiple gears with special profile modification or transition part of crest and roots. Besides, it can grind non-involute profile like cycloidal gear, oil pump rotor, precision spline and screw.
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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