USED DMG MORI IGH-7NT

The DMG MORI IGH-7NT is a high-precision CNC internal grinding machine designed for medium-length components requiring superior accuracy, surface finish, and multi-process capability. As part of the IGH horizontal grinding series, it is widely used in industries such as aerospace, automotive, tool manufacturing, and spindle production, where precision internal and external geometries must be maintained within micron tolerances. The IGH-7NT stands out as a mid-range model in the series, offering a balance between capacity and compact machine footprint.

The machine features a swing diameter of 300 mm, a maximum grinding diameter of 275 mm, and a grinding length of up to 450 mm, with the ability to handle workpieces up to 750 mm in length. This extended capacity compared to smaller models like the IGH-2NT makes it suitable for longer shafts, spindle components, and precision cylindrical parts. The machine operates with a work spindle speed of up to 900 rpm and weighs approximately 7,500 kg, providing strong structural rigidity and vibration stability during grinding.

A key feature of the IGH-7NT is its turret-type wheelhead equipped with both internal and external grinding spindles. This allows ID, OD, face, and taper grinding to be performed in a single setup, significantly improving efficiency and accuracy. The NC-controlled swivel table offers ultra-fine angular adjustment down to 0.0001°, enabling highly precise taper grinding and complex geometries.

The machine is typically equipped with a FANUC CNC control system, ensuring advanced programmability, repeatability, and integration with automation systems such as NC loaders and automatic measurement devices. Overall, the IGH-7NT is a versatile and high-performance grinding solution, ideal for manufacturers who require precision machining of medium-length components with consistent quality and reduced setup time.

DMG MORI IGH-7NT SPECIFICATIONS

WHY BUY USED DMG MORI IGH-7NT

Buying a used DMG MORI IGH-7NT is a smart investment for manufacturers seeking advanced internal grinding capability without the high capital cost of a new machine. One of the primary advantages is significant cost savings. High-precision CNC grinding machines are expensive when purchased new due to their complex design and accuracy requirements, but used machines retain most of their functional performance while being available at a substantially lower price.

Another important factor is the machine’s durability and engineering quality. DMG MORI machines are known for their rigid construction and long operational life. The IGH-7NT, with its heavy base and stable structure, maintains accuracy over extended periods. Because grinding operations involve lower cutting forces compared to milling or turning, wear on structural components is relatively minimal, allowing even older machines to remain productive when properly maintained.

Cutting time, or machine hours, plays a critical role when evaluating a used IGH-7NT. Machines with lower grinding hours generally offer better spindle condition, higher axis accuracy, and longer service life. However, even machines with higher usage can still be valuable if they have undergone proper maintenance or refurbishment, such as spindle rebuilding, encoder replacement, or CNC upgrades. In many cases, maintenance history is more important than the machine’s age.

Another advantage is immediate availability. Used machines can often be installed and put into operation quickly, avoiding the long lead times associated with new equipment. Many used IGH-7NT machines also include tooling, fixtures, or automation features, which add further value and reduce setup costs.

Finally, depreciation works in favor of the buyer. CNC grinding machines lose value significantly over time, but their precision capabilities remain intact. This makes a used IGH-7NT an excellent option for companies looking to expand production capacity or enter precision grinding without a large upfront investment.

HOW MUCH DOES A USED DMG MORI IGH-7NT COST?

The cost of a used DMG MORI IGH-7NT varies based on factors such as manufacturing year, machine condition, cutting hours, included tooling, and any retrofits or upgrades. As a mid-to-large capacity internal grinding machine, it typically commands higher prices than smaller models due to its extended grinding length and versatility.

For machines manufactured before 2000, prices generally range between $30,000 and $70,000. These machines often have higher cutting hours and may require refurbishment, such as spindle rebuilding, replacement of feedback systems, or CNC control upgrades. However, if properly maintained, they can still deliver reliable performance for less demanding applications or lower production volumes.

Machines from the 2000–2010 period typically fall within the $60,000 to $120,000 range. These units usually feature improved CNC controls and better automation compatibility. Cutting time becomes a major pricing factor in this category—machines with lower hours or recent refurbishments tend to command higher prices due to better reliability and precision.

For newer machines manufactured between 2010 and 2025, prices can range from $110,000 to $220,000 or more. These machines generally have lower cutting hours, better accuracy retention, and may include advanced features such as automatic measurement systems or loading automation. They are well-suited for high-precision and high-volume production environments.

Cutting time remains one of the most critical determinants of price. A low-hour machine with a strong maintenance record can command a premium, while a high-hour machine may require additional investment in repairs, calibration, or component replacement. Buyers should also factor in installation, tooling, and potential upgrades. Overall, the IGH-7NT offers strong value in the used market, combining precision, flexibility, and long-term reliability at a competitive price point.