USED DMG MORI NVG-12LH

The DMG MORI NVG-12LH is an ultra-large CNC vertical deep-hole grinding machine designed for machining very large, heavy cylindrical components with extreme internal precision. Developed under DMG MORI in collaboration with Taiyo Koki, this model belongs to the NVG series, which is specifically engineered for deep internal grinding applications where conventional machines cannot maintain accuracy over long bore depths. It is widely used in heavy industries such as construction machinery, energy equipment, hydraulic systems, and large industrial cylinder manufacturing.

The NVG-12LH features a swing diameter of 1,150 mm and a maximum grinding diameter of 1,150 mm, with a maximum workpiece height of 1,300 mm and grinding length of up to 1,200 mm. It is designed to handle extremely heavy workpieces, typically up to 2,000 kg including fixtures, making it suitable for large hydraulic cylinders and deep bore components. The work spindle operates at speeds up to 90 rpm, while the grinding spindle reaches up to 6,000 rpm, ensuring controlled and stable material removal even in deep-hole conditions.

A key feature of the NVG-12LH is its dedicated deep-hole grinding spindle system, which allows stable machining of long internal bores with very high accuracy. The vertical structure improves setup convenience and reduces deformation by using gravity-assisted positioning, making centering easier even for large and heavy parts. This also helps improve roundness, cylindricity, and surface finish quality across long internal surfaces.

The machine incorporates high-precision feedback systems with 0.1 µm-level control to minimize thermal and mechanical deviations during long grinding cycles. It also includes heat isolation design elements such as air gaps between structural components to reduce thermal influence from coolant systems. Overall, the NVG-12LH is a heavy-duty, ultra-precision deep-hole grinding solution designed for the most demanding large-scale industrial applications.

DMG MORI NVG-12LH SPECIFICATIONS

WHY BUY USED DMG MORI NVG-12LH

Buying a used DMG MORI NVG-12LH is a strategic investment for manufacturers handling large deep-hole components but aiming to reduce capital expenditure. One of the biggest advantages is cost savings. New machines in this category are extremely expensive due to their size, specialized deep-hole spindle systems, and precision engineering. Used units provide similar machining capability at a significantly lower investment level.

Another major advantage is long-term durability. Machines from DMG MORI are built for heavy industrial use, and the NVG-12LH is specifically designed for low-speed, high-precision grinding of large internal bores. Because grinding forces are relatively low, structural wear is reduced, allowing even older machines to remain accurate if properly maintained.

Cutting time (machine hours) is especially critical for this model. Machines with lower operating hours generally offer better spindle condition, higher geometric accuracy, and longer remaining service life. However, high-hour machines can still be valuable if they have undergone proper refurbishment such as spindle rebuilding, guideway restoration, or control system upgrades. Maintenance history is often more important than age alone in this category.

Another advantage is availability. Used NVG-12LH machines are typically difficult and expensive to procure new due to long lead times and customization requirements. Used options can often be sourced faster and installed sooner, helping manufacturers quickly expand capacity. Many units also include fixtures, tooling, or automation systems, reducing setup cost and commissioning time.

Depreciation also strongly benefits buyers. Ultra-large grinding machines lose significant value over time while retaining core functionality. This makes the NVG-12LH an attractive option for companies expanding deep-hole grinding capacity without committing to extremely high capital investment.

HOW MUCH DOES A USED DMG MORI NVG-12LH COST?

The cost of a used DMG MORI NVG-12LH depends heavily on manufacturing year, machine condition, cutting hours, spindle wear, and included accessories or automation. As an ultra-large deep-hole grinding machine, it sits in the premium-to-ultra-premium segment of the used CNC grinding market due to its size and specialized application.

For machines manufactured before 2000, prices typically range from $80,000 to $180,000. These units often have high cutting hours and may require significant refurbishment such as spindle rebuilding, control system upgrades, or mechanical reconditioning. However, they can still be suitable for lower production requirements if properly restored.

Machines from the 2000–2010 period generally range between $180,000 and $400,000. These models often include improved CNC controls and better thermal stability systems. At this stage, cutting time becomes a major pricing factor—machines with lower hours or strong maintenance records command significantly higher value due to better accuracy and reliability.

For newer machines manufactured between 2010 and 2025, prices can range from $400,000 to $900,000 or more, depending on configuration, condition, automation level, and usage history. Machines equipped with low cutting hours, upgraded feedback systems, or integrated measurement technology typically command premium pricing due to their higher productivity and precision retention.

Cutting time remains one of the most important pricing drivers. Lower-hour machines offer better spindle health and reduced maintenance risk, while high-hour machines may require additional investment in refurbishment or recalibration. Buyers should also consider installation complexity, tooling, and logistics costs, which are significant for machines of this scale. Overall, the NVG-12LH represents a high-value but highly specialized investment for deep-hole precision grinding in heavy industry.