| Model | Unit | GH200 | |
|---|---|---|---|
| Type | SA | SB | |
| Max workpiece diameter | mm | Φ200 (7.9”) | Φ200 (7.9”) |
| Max module | mm | 4 | 6 |
| Max worktable speed | r/min | 25 | 32 |
| Spindle speed/step | r/min | 70-365/8 | 77-488/9 |
| Distance between hob axis and worktable surface | mm | 125-295 (4.9-12”) | 260-430 (10-17”) |
| Central distance between hob and worktable | mm | 20-170 (0.79-6.7”) | 30-175 (1.2-6.9”) |
| Distance between tailstock end face and worktable surface | mm | 240-438 (9.5-17”) | 310-510 (12-20”) |
| Hob shifting travel (manual) | mm | 50 (2”) | 140x140 (5.5x5.5”) |
| Max hob head swivel angle | degree | ±45 | 95 |
| Max hob diameter and length | mm | Φ110x110 (4.3x4.3”) | Φ45 (1.7”) |
| Worktable diameter x bore diameter | mm | Φ180x40 (7.1x1.6”) | Φ320x65 (13x2.6”) |
| Worktable T-slot | 3xM12 | 3x18 | |
| Total power / main motor power | kVA/kW | 4.3/3 | 10.99/7.5 |
| Machine dimension (L x W x H) | mm | 1740x1150x1570 | 2250x1590x1720 |
| Net weight / gross weight | kg | 2000/2250 | 3500/4200 |
Standard accessories
1. Hob arbor assembly: Φ22, 27mm;
2. Change gears;
3. Tools for installation and set up;
Optional accessories
1. Hob arbor assembly: Φ13, 16, 32mm;
2. Chip conveyor;
3. Hydraulic clamping device;
4. Hobbing fixture;
Features
1. With vertical design, worktable can move in radial as radial feed movement.
2. Electrical system with fail-safe control and low failure rate is controlled by PLC.
3. The module valves have high reliability and low failure rate in order to be convenient to diagnose failures and maintain hydraulic system.
4. The worktable is fitted with double-start worm as its index gearing, therefore is suitable for cutting the workpiece with less teeth.
5. The worktable adopts precision double-end worm gear, hob shifting, high rigidity, good heat stability and may adopt conventional or climb method, achieving semi-automatic cycle
6. The hob spindle adopts circulating lubrication to ensure sufficient and reliable lubrication for spindle bearings in order to prolong the service life. Meanwhile circulating oil can quickly remove heat caused by spindle running to ensure high rotary accuracy for the spindle.
1. With vertical design, worktable can move in radial as radial feed movement.
2. Electrical system with fail-safe control and low failure rate is controlled by PLC.
3. The module valves have high reliability and low failure rate in order to be convenient to diagnose failures and maintain hydraulic system.
4. The worktable is fitted with double-start worm as its index gearing, therefore is suitable for cutting the workpiece with less teeth.
5. The worktable adopts precision double-end worm gear, hob shifting, high rigidity, good heat stability and may adopt conventional or climb method, achieving semi-automatic cycle
6. The hob spindle adopts circulating lubrication to ensure sufficient and reliable lubrication for spindle bearings in order to prolong the service life. Meanwhile circulating oil can quickly remove heat caused by spindle running to ensure high rotary accuracy for the spindle.
1. Hob arbor assembly: Φ22, 27mm;
2. Change gears;
3. Tools for installation and set up;
1. Hob arbor assembly: Φ13, 16, 32mm;
2. Chip conveyor;
3. Hydraulic clamping device;
4. Hobbing fixture;
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.
Keywords: Knee Type Milling Machine, Vertical Milling Machine, Horizontal Mill, Turret Mill, Knee-and-Column Mill, Milling Machine for Sale, Industrial Milling, Metalworking Equipment, Workshop Machinery, CNC Mill, Toolroom Mill, Precision Machining, Fortune Pacific, Machine Tool Manufacturer.