CNC Jig Grinder (Table Size 1440×860mm)

CNC Jig Grinding Machine

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NJ-MK4280/1

CNC Jig Grinder

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”

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

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