| Model | Unit | GH320 | |
|---|---|---|---|
| Type | CNC4 | CNC5 | |
| CNC system | FANUC 0i-MD; 4-axis | FANUC 0i-MD; 5-axis | |
| Max workpiece diameter | mm | Φ320 (13”) | Φ320 (13”) |
| Max module | mm | 8 | 8 |
| Min number of teeth | 6 | 6 | |
| Min unit for programming | mm | 0.001 | 0.001 |
| Max worktable speed | r/min | 40 | 40 |
| Hob spindle speed | r/min | 120-540 | 120-540 |
| Axial feed speed | mm/r | 0.5-4 | 0.5-4 |
| Radial feed speed | mm/r | 1-4 | 1-4 |
| Central distance between hob and worktable | mm | 60-250 (2.4-9.8”) | 60-250 (2.4-9.8”) |
| Distance between hob axis and worktable surface | mm | 265-515 (10-20”) | 265-515 (10-20”) |
| Distance between tailstock end face and worktable surface | mm | 350-660 (14-26”) | 360-660 (14-26”) |
| Max hob axial travel | mm | 145 (5.7”) | 150 (5.9”) |
| Max hob head swivel angle | degree | ±45 | ±45 |
| Max hob diameter and length | mm | Φ160x200 (6.3x7.9”) | Φ160x200 (6.3x7.9”) |
| Worktable diameter x bore diameter | mm | Φ320x100 (13x3.9”) | Φ320x100 (13x3.9”) |
| Total power / main motor power | kVA/kW | 32/18 | 32/18 |
| Machine dimension (L x W x H) | mm | 3330x2720x2500 | |
| Packing size (L x W x H) | mm | 3250×2280×3130; 2350×2250×1700 1670×1050×2570; 1700×750×820 |
|
| Net weight / gross weight | kg | 9000/10000 | |
Standard accessories
1. Hob arbor assembly: Φ32, 40mm;
2. Change gears;
3. Tools for installation and set up;
Optional accessories
1. Hob arbor assembly: Φ22, 27, 50mm;
2. Workpiece fixture;
3. Deburring device;
Features
1. Being of vertical design, main components like bed and column adopt the double-wall construction with large-size reinforce-rib, rectangular, flat and ample guideways covered with Teflon, features compact construction, short transmission chain and high accuracy.
2. Axial and radial feed axes are driven by AC servo motor through preloaded ball screws.
3. All guideways are automatically lubricated.
4. With high degree of automation, they can work in several square cycles; in addition, cutting parameters can also be changed automatically in each square cycle. Either climb or conventional method may be used; can cut workpiece with multi-start hob and higher feed rate.
5. Can work repeatedly under the square cycles. Changing radial feed rate, selection of climb or conventional hobbing, hob shifting functions is available.
1. Hob arbor assembly: Φ32, 40mm;
2. Change gears;
3. Tools for installation and set up;
Optional accessories
1. Hob arbor assembly: Φ22, 27, 50mm;
2. Workpiece fixture;
3. Deburring device;
| Model | Unit | GH320 | |
|---|---|---|---|
| Type | CNC4 | CNC5 | |
| CNC system | FANUC 0i-MD; 4-axis | FANUC 0i-MD; 5-axis | |
| Max workpiece diameter | mm | Φ320 (13”) | Φ320 (13”) |
| Max module | mm | 8 | 8 |
| Min number of teeth | 6 | 6 | |
| Min unit for programming | mm | 0.001 | 0.001 |
| Max worktable speed | r/min | 40 | 40 |
| Hob spindle speed | r/min | 120-540 | 120-540 |
| Axial feed speed | mm/r | 0.5-4 | 0.5-4 |
| Radial feed speed | mm/r | 1-4 | 1-4 |
| Central distance between hob and worktable | mm | 60-250 (2.4-9.8”) | 60-250 (2.4-9.8”) |
| Distance between hob axis and worktable surface | mm | 265-515 (10-20”) | 265-515 (10-20”) |
| Distance between tailstock end face and worktable surface | mm | 350-660 (14-26”) | 360-660 (14-26”) |
| Max hob axial travel | mm | 145 (5.7”) | 150 (5.9”) |
| Max hob head swivel angle | degree | ±45 | ±45 |
| Max hob diameter and length | mm | Φ160x200 (6.3x7.9”) | Φ160x200 (6.3x7.9”) |
| Worktable diameter x bore diameter | mm | Φ320x100 (13x3.9”) | Φ320x100 (13x3.9”) |
| Total power / main motor power | kVA/kW | 32/18 | 32/18 |
| Machine dimension (L x W x H) | mm | 3330x2720x2500 | |
| Packing size (L x W x H) | mm | 3250×2280×3130; 2350×2250×1700 1670×1050×2570; 1700×750×820 |
|
| Net weight / gross weight | kg | 9000/10000 | |
1. Being of vertical design, main components like bed and column adopt the double-wall construction with large-size reinforce-rib, rectangular, flat and ample guideways covered with Teflon, features compact construction, short transmission chain and high accuracy.
2. Axial and radial feed axes are driven by AC servo motor through preloaded ball screws.
3. All guideways are automatically lubricated.
4. With high degree of automation, they can work in several square cycles; in addition, cutting parameters can also be changed automatically in each square cycle. Either climb or conventional method may be used; can cut workpiece with multi-start hob and higher feed rate.
5. Can work repeatedly under the square cycles. Changing radial feed rate, selection of climb or conventional hobbing, hob shifting functions is available.
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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