φ725mm Swing · φ500mm Max Grinding Diameter · 450mm Max Depth

The MK2150 is a high-performance CNC internal grinding machine specifically engineered for large-diameter, deep-hole machining. With a grinding diameter range of 50 to 500mm and a maximum depth of 450mm, it delivers outstanding results for thick-walled, high-strength components.

MK2150 Series

Regular maintenance

Spare parts supply

On-site installation service

Customized design

Key Features

● Massive Internal Grinding Capacity: 50–500mm. Handles a wide spectrum of industrial inner diameters including stepped, conical, and cylindrical bores.

● Deep Bore Capability: Up to 450mm. Enables grinding of long sleeve cylinders, stator housings, and other deep internal features.

● CNC-Controlled Multi-Axis System: Automates feed, spark-out, and return cycles with sub-micron precision.

● Sturdy Bed and Slideways with Thermal Stability: Ensures dimensional consistency and vibration-free operation during prolonged grinding.

● Optional In-Process Measuring System: Offers real-time bore measurement and automatic adjustment for ultra-high accuracy.

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Recommended Configurations

● Heavy-Duty Hydraulic Chuck： Securely clamps large-diameter, deep-hole workpieces.

● Multi-Wheel Turret Head： Enables sequential rough and finish operations without manual changeover.

● In-Process Bore Gauge： Automatically monitors and adjusts for bore dimension during grinding.

● Linear Encoder Feedback： Enhances positioning accuracy for large component handling.

● Programmable Coolant System： Ensures optimal flow for deep and high-heat internal grinding.

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Application Case

● Workpiece: Bearing housing with 420mm internal diameter and 400mm depth.

● Setup: MK2150 + 3-point in-process gauge + Siemens CNC + hydraulic chuck.

● Results: Bore tolerance achieved: ≤ ±0.004 mm, surface finish: Ra 0.25 μm, cycle time reduced by 32% with turret head automation, customer note: "Extremely stable for deep ID grinding with excellent bore roundness."

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Specifications	Unit	MK2150
Grinding hole diameter	mm	50-500
Max.grinding depth	mm	450
Max.swinging over the table	mm	725
Max.table travel(Z-axis)	mm	700
Max.travel of the wheel head(X-axis)	mm	180
Max.speed of Z-axis	m/min	8
Max.speed of X-axis	m/min	5
Workpiece spindle speed	r/min	30~300
Bore roundness	mm	0.003
Cylindricity of bore	mm	0.005
Surface roughness of bore	μm	Ra0.4
Surface roughness of end face	μm	Ra0.8
Perpendicularity of end face to bore	μm	0.005
Max.turning angle of headstock	°	15
Total power of machine	kw	19
Machine weight	kg	6000

MN CATALOG.pdf

Frequently Asked Questions

1、I only have part drawings. Can you recommend a suitable internal cylindrical grinding machine?

Absolutely! Minnuo has an experienced pre-sales technical team. As long as you provide the part drawings, whether it's for internal hole machining with an internal cylindrical grinding machine or a customized model with combined functions, we can recommend a single machine within 10 minutes. For solutions involving multiple machines, a complete proposal will be provided within 5 working days.

2、Can I customize a CNC internal cylindrical grinding machine to match my process requirements?

Yes. I can customize a CNC internal cylindrical grinding machine based on workpiece size, accuracy requirements, automation level, and more—including spindle type, grinding wheel configuration, automatic loading/unloading system, and cooling system—so it fully matches my on-site production needs.

3、 How is the quality of your internal cylindrical grinding machines guaranteed?

We are equipped with multiple high-end international machining centers, ensuring that all key components of the internal cylindrical grinding machine have high precision and consistency. Each machine is fully tested before delivery and comes with a detailed quality inspection report.

4、What is the typical delivery time?

For standard models, we have inventory available for fast delivery. For customized internal cylindrical grinding machines, the delivery time is generally 30–45 working days. We will confirm the exact timeline based on the complexity of the order.

5、Do you support full machine customization?

Yes. Whether it’s the control system, machine bed design, grinding range, or sheet metal guarding, I can fully customize the internal cylindrical grinding machine based on my specific needs. You also offer combined solutions like internal and external cylindrical grinding machines in a single setup.

6、What types of workpieces are suitable for an internal bore grinding machine?

An internal bore grinding machine is mainly used for machining internal holes of parts such as sleeves, gear bores, bearing inner rings, and hydraulic components. You can use it to achieve high-precision grinding of inner bores, stepped holes, tapered holes, and more. It is widely applied in industries like automotive, hydraulics, and mold manufacturing.

7、What level of accuracy can a high precision internal grinding machine achieve?

Our high precision internal grinding machine can consistently achieve machining accuracy within 2μm, and some high-end models can reach below 1μm in a temperature-controlled workshop. If I have high requirements for roundness or coaxiality, I can also choose optional in-process measuring systems and active dressing units.

8、 Is it complicated to maintain an internal cylindrical grinding machine during use?

Not at all. You only need to regularly check the lubrication oil, grinding wheel wear, spindle operation status, and whether the cooling system is functioning properly. Our internal cylindrical grinding machine is designed with a compact structure and easy maintenance in mind. We also provide maintenance manuals and training services to help you complete daily upkeep with ease.