Used Ningjiang MK4280 CNC Jig Grinder | Siemens 828D

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Product Highlight

Used Ningjiang MK4280 CNC jig grinder is a large-capacity precision coordinate grinding machine equipped with Siemens 828D CNC control. Its 800 × 1120 mm worktable, 1000 mm X travel, 700 mm Y travel and high-speed grinding spindle configuration make it suitable for precision holes, hardened contours, molds, dies, punches and complex components. It offers an alternative for manufacturers seeking jig-grinding capability without the investment required for a new high-end precision grinder.

Product Description

Used Ningjiang MK4280 CNC jig grinder is a large gantry-type precision grinding machine made in China and equipped with a Siemens SINUMERIK 828D CNC control. With a 1000 mm X-axis travel, 700 mm Y-axis travel, 800 × 1120 mm worktable and 1000 kg table capacity, it is designed for precision grinding of hardened coordinate holes, bores, mold cavities, punches, profiles and complex components.

Its combination of a large working envelope, high-speed grinding spindle and multi-axis grinding capability makes it a practical option for toolrooms, mold manufacturers and precision machining companies looking for a cost-effective used CNC jig grinding machine.

Technical Specifications

Specification	Details
Machine Type	Used CNC Jig Grinder / CNC Coordinate Grinding Machine
Brand	Ningjiang / PUSH NINGJIANG
Model	MK4280
Country of Origin	China
CNC Control	Siemens SINUMERIK 828D
Machine Structure	Gantry Type
Worktable Size	800 × 1120 mm
Table Travel	1000 mm
X-Axis Travel	1000 mm
Y-Axis Travel	700 mm
W-Axis Travel	600 mm
Z-Axis / Grinding Stroke	180 mm
U-Axis Travel	6 mm
C-Axis Rotation	360°
C-Axis Speed	30 rpm
Maximum Table Load	1000 kg
Maximum Rapid Table Speed	3000 mm/min
Guideway Type	Hydrostatic Guideway
X/Y Drive	Servo Drive with Screw Transmission
Minimum Transverse Feed Increment	0.1 μm
Minimum Longitudinal Feed Increment	0.1 μm
Grinding Wheel Reciprocating Stroke	180 mm
Reciprocating Speed	0.01–10 m/min
Grinding Head Cross Travel	620 mm
Electric Grinding Spindle Speed	45,000–80,000 rpm
Pneumatic Grinding Spindle Speed	100,000–180,000 rpm
Maximum Grinding Hole Diameter	220 mm
Maximum Taper Grinding Angle	16°
Electrical Input	10 kVA
Approx. Net Weight	14,000 kg
Overall Dimensions	Approx. 3005 × 2380 × 3379 mm*

Applications & Suitable Machining

Used Ningjiang MK4280 used CNC jig grinder is intended for precision and semi-precision grinding of hardened components where accurate hole position, contour geometry and surface finish are important. Typical operations include internal and external cylindrical grinding, large-hole grinding, coordinate-hole grinding, end-face and shoulder grinding, taper grinding, internal groove grinding and the grinding of complex profiles.

It is especially suitable for precision molds and dies, punches, templates, jigs and fixtures, ring and plate components, precision machine parts and toolroom components. Its large table and gantry configuration also make it useful for single-piece production, small-batch manufacturing and precision workshops handling relatively large workpieces.

Ningjiang's jig-grinding product family is designed around continuous-path and point-to-point grinding of hardened contours and coordinate-hole systems, which is consistent with the intended application of the MK4280 series.

FAQ

What CNC control is installed on this MK4280 jig grinder?

This machine is equipped with a Siemens SINUMERIK 828D CNC system, providing a familiar industrial control platform for precision grinding operations.

What are the table size and maximum workpiece capacity?

The worktable measures 800 × 1120 mm and has a stated maximum loading capacity of 1000 kg. X-axis travel is 1000 mm and Y-axis travel is 700 mm.

What type of grinding work can the Ningjiang MK4280 perform?

The machine can be used for coordinate-hole grinding, internal and external grinding, large-hole grinding, taper grinding, grooves, mold cavities, punches and complex precision contours. The exact process capability depends on the grinding spindle, tooling and accessories supplied with the machine.