CNC Jig Grinder
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NJ-MK4280/1
Coordinate grinding machine with continuous path capability for creating precise holes and complex contours in mold and die making
This CNC jig grinder supports continuous-path machining for hardened mould cavities, templates and punches, generating precise curves using linear and circular approximation. It also performs high-accuracy point-to-point grinding for hardened coordinate hole systems with tight spacing requirements.
The jig grinding machine uses a SIEMENS CNC system to control the X, Y, Z, W, U and C axes, with three-axis simultaneous interpolation. X, Y, Z and W axes are fitted with HEIDENHAIN high-accuracy linear scales to ensure consistent positioning and stable linear-axis precision.
Features
High Precision
Hydrostatic planetary spindle
Hand-scraped guideways and table surfaces, with over 1500 hours of manual scraping
- Hole-spacing accuracy: ±0.003 mm
- X/Y-axis positioning accuracy: 0.0025 mm, repeatability: 0.0015 mm
- Spindle radial runout < 0.0005 mm (four times higher stability)
- Maximum spindle radial stiffness: 250 N/μm (five times higher)
- Achievable roundness: up to 0.5 μm
- Simplified structure allowing both linear movement and rotary motion of the spindle
High Efficiency
Disc-type dresser
- Z-axis driven by dual linear motors
- High-speed grinding spindle up to 70,000 r/min
- Spindle power: 2 kW
- HSK-E25 tool interface
- Optional workpiece probing
- Z-axis rapid traverse: 26 m/min
- Z-axis reciprocating frequency up to 300 strokes/min
- Z-axis repeatability: 0.002 mm
- Dresser wheel diameter: Ø120 mm
- Dresser speed: 8000 r/min, power: 0.8 kW
Intelligent Functions
Automatic wheel measurement
Workpiece probing
Optional Configurations
- Automatic wheel measurement
- Workpiece probe
- Tool probe (TS27R)
- 12-position tool magazine for building a fully integrated “jig grinding center”
Sample Display
Technical Specifications
| Worktable | Table width (mm) | 860 | |
| Table length (mm) | 1440 | ||
| X-axis longitudinal travel (mm) | 1300 | ||
| Max. table load capacity (kg) | 800 | ||
| X-axis positioning accuracy (mm) | Bidirectional positioning accuracy | 0.004 | |
| Repeatability | 0.002 | ||
| Grinding Headstock | Y-axis transverse travel (mm) | 800 | |
| W-axis vertical travel (mm) | 635 | ||
| Distance from slide end face to table surface (mm) | Max. | 905 | |
| Min. | 100 | ||
| Y-axis positioning accuracy (mm) | Bidirectional positioning accuracy | 0.004 | |
| Repeatability | 0.002 | ||
| Grinding Wheel | Z-axis reciprocating stroke length (mm) | 170 | |
| Z-axis reciprocating stroke speed (m/min) | 0.01–22 | ||
| Grinding wheel motor speed (10⁴ r/min) | 0.4–4 | ||
| Planetary Spindle | Planetary spindle speed (r/min) | S-axis | 5–300 |
| C-axis | ≤30 | ||
| Planetary Grinding Feed | U-axis slide CNC feed range (mm) | -3 to 47 | |
| Total power input (kVA) | 60 | ||
| Machine weight (kg) | Approx. 16000 | ||