Used Okamoto IGM-15NC CNC Internal Grinder: High-Precision Bore Finishing
Author：JINYI Date：2026-05-07
This used Okamoto IGM-15NC CNC Internal Grinder is in stock and available for immediate inspection. Engineered for high-precision bore grinding, this unit features a 10,000–60,000 RPM spindle and a 6–100 mm grinding capacity. It offers a flexible, reliable solution for shops requiring consistent, tight-tolerance internal finishing. With its compact footprint and legendary Japanese build quality, this machine is ready to integrate into your production line and increase throughput for small-to-medium precision components.
Suitable Parts and Typical Industries
The Okamoto IGM-15NC is built for versatility, making it a workhorse for shops managing a high mix of precision components. Its 6 mm to 100 mm bore capacity bridges the gap between micro-component processing and medium-sized industrial part finishing.
Automotive and Powertrain
This machine is frequently used for grinding internal bores in gears, bushings, and fuel injection components. The high-speed spindle delivers the surface finish quality demanded by automotive OEMs.
Hydraulic and Pneumatic Systems
For valve bodies, cylinder sleeves, and pump housings, the IGM-15NC provides the geometric accuracy required for proper sealing and fluid flow. The machine’s rigid Okamoto design minimizes vibration—essential when processing hardened steel hydraulic components.
Aerospace and Medical Devices
The machine’s precision is ideal for smaller aerospace housings and medical instrument parts. The CNC control ensures batch-to-batch consistency, minimizing scrap rates on high-value materials.
Best-Fit Processes and throughput requirements
The IGM-15NC is built for shops that prioritize quality and repeatability. Its specifications are optimized for these production scenarios:
- High-Speed Finishing: With a grinding spindle speed reaching 60,000 RPM, this machine is ideal for small-diameter bores where high surface feet per minute (SFM) are required to achieve a mirror-like finish.
- Taper Grinding: The -5° to +15° swivel range provides the flexibility to grind tapered internal bores, a common requirement for bearing seats and specialized hydraulic fittings.
- Batch Consistency: The CNC architecture allows for rapid setup changes between part numbers, making it an excellent candidate for shops running medium-to-high volume batches of similar part families.
- Precision Bore Sizing: The 300 x 500 mm axis travel offers sufficient clearance for a wide variety of workpieces, ensuring the machine is not limited to a single part geometry.
what kind of operation this machine fits
This machine is an ideal fit for facilities needing a reliable, versatile internal grinder. It is particularly effective in:
- Tier 2 and Tier 3 Automotive Suppliers: Shops that need to produce precision bores in hardened steel gears or bushings without investing in multiple specialized machines.
- Job Shops: Facilities that handle diverse contracts and need a machine capable of switching quickly between different bore diameters and lengths.
- Precision Tooling Departments: In-house machine shops within larger manufacturing plants that need to produce custom jigs, fixtures, or replacement parts for their own production lines.
If your production floor is currently bottlenecked by internal grinding capacity, or if you are looking to replace an aging, less precise unit, the Okamoto IGM-15NC offers an excellent balance of footprint efficiency (2800 x 2240 mm) and operational capability.
Why This Machine Works in These Scenarios
The value of the Okamoto IGM-15NC lies in its balance of high-speed performance and structural rigidity. The 12 kVA power rating provides sufficient torque for standard grinding, while the 60,000 RPM spindle head is the key to its versatility.
| Feature | Production Benefit |
|---|---|
| 10,000–60,000 RPM Spindle | Allows for optimal surface speed across a wide range of bore sizes (6–100 mm). |
| -5° to +15° Swivel | Enables complex taper grinding without secondary setups. |
| 300 x 500 mm Travel | Accommodates a broad spectrum of part lengths and diameters. |
| Compact Footprint | Maximizes floor space utilization in crowded job shops. |
Frequently Asked Questions
Q: Can this machine handle both small bores and medium-sized diameters?
A: Yes. The IGM-15NC is designed with a grinding bore capacity of 6–100 mm, making it highly versatile for shops that process a variety of part sizes, from small bushings to medium-sized housings.
Q: Is the high-speed spindle suitable for all types of grinding wheels?
A: The 60,000 RPM capability is designed for high-precision finishing. We recommend consulting the machine's operational guidelines regarding the specific abrasive types and wheel diameters compatible with this spindle speed range.
Q: How does the swivel angle affect my production capabilities?
A: The -5° to +15° swivel range allows you to perform taper grinding directly on the machine. This eliminates the need for specialized tooling or secondary operations to achieve tapered internal geometries.
Q: Is this machine suitable for high-volume production lines?
A: The IGM-15NC is a CNC-controlled machine capable of consistent, repeatable performance. It is well-suited for medium-to-high volume batches, provided the loading and unloading process is optimized for your specific part cycle time.
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