Main parameters | Unit | PTM210 |
---|---|---|
Max. swing over bed | mm(in) | Φ840 (33’’) |
Max. outer diameter of pipe | mm(in) | Φ210 (8.3’’) |
Max. swing over carriage | mm(in) | Φ560 (22’’) |
Max. length of workpiece | mm(in) | 1500/3000/4000/5000/6000 (59’’/118’’/157’’/197’’.236’’) |
Max. turning length | mm(in) | 1350/2850/3850/4850/5850 (53’’/112’’/152’’/191’’/230’’) |
Max weight of workpiece between centers | kg | 3000 |
Width of bed | mm(in) | 600 (24’’) |
Spindle bore diameter | mm(in) | Φ210 (8’’) |
Taper of spindle bore | Metric 225 | |
Spindle nose | C type flange connected | |
Spindle speed range | r/min | 12 steps 45-572 |
Morse taper of center sleeve | MT-6 | |
Longitudinal feed | mm/r | 32kinds; 0.1-1.5 |
Transverse feed | mm/r | 32kinds; 0.05-0.75 |
Pitch of leadscrew | mm(in) | 12 (0.5’’) |
Metric thread | mm | 22kinds; 1-15 |
Inch thread | TPI | 28kinds; 15-1 |
Module thread | mm | 21kinds; 0.5-7.5 |
Diametrical pitch thread | DP | 20kinds; 28-2 |
Diameter of tailstock sleeve | mm(in) | 100 (4’’) |
Travel of tailstock sleeve | mm(in) | 300 (12’’) |
Taper of tailstock sleeve | MT-6 | |
Max travel of top slide | mm(in) | 240 (9’’) |
Max travel of cross slide | mm(in) | 500 (20’’) |
Double-speed motor power | kW | 9/11 |
Double-speed motor speed | r/min | 1000/1500 |
Rapid-travel motor power | kW | 1.1 |
Rapid-travel motor speed | r/min | 1350 |
Coolant pump motor power | kW | 0.125 |
Coolant pump motor flow | L/min | 22 |
Gear pump speed | r/min | 1450 |
Net weight / Gross weight | kg | 4300/5800/6600/7600/8800; 6000/6500/7300/8600/10000 |
Overall dimension (L x W x H) | mm | 3515/6160/7160/8160/9160 x 1395 x 1650 |
Packing size (L x W x H) | mm | 4000/6800/7800/8800/9800 x 1800 x 2000 |
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.
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.
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.
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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