Used TAIYO KOKI IGS-4NT CNC internal hole grinder
| Stock Number | 810863 |
| Brand / Origin | Taiyo Koki / Japan |
| Model | IGS-4NT |
| CNC System | Fanuc 18i-TB |
| Grinding ID Range | 10 ~ 200 mm (P) |
| Grinding OD Capacity | (Q) 240 mm / (P) 120 mm |
| Max Grinding Length | 320 mm |
| Swing over Spindle Base | 4450 mm |
| Work Spindle Speed | 20 ~ 300 rpm |
| Configuration | 3 Internal Spindles (GMN 30k/18k/12k RPM), Roller Dresser, Tokyo Seimitsu Face Gauge |
1. Equipment Overview: The Precision of Taiyo Koki Engineering
The Taiyo Koki IGS-4NT (Stock 810863) represents the pinnacle of Japanese vertical grinding technology. Designed for high-precision internal and external grinding, this machine utilizes a vertical orientation to eliminate the negative effects of gravity on workpiece concentricity—a common challenge in traditional horizontal grinding. As a used industrial asset, this Taiyo Koki IGS-4NT offers a rare combination of rigidity, versatility, and advanced automation, making it a highly sought-after solution for automotive, aerospace, and high-end bearing manufacturing.
This specific unit from Japan is built on a heavy-duty cast-iron bed, providing exceptional thermal stability and vibration dampening. For engineers and factory managers, the Taiyo Koki brand is synonymous with sub-micron accuracy and long-term reliability. The vertical design also facilitates easier loading and unloading of heavy or irregularly shaped parts, significantly improving ergonomic safety and cycle efficiency.
2. Technical Specifications Analysis: High-Speed Versatility
Advanced CNC Control with Fanuc 18i-TB
At the heart of the Taiyo Koki IGS-4NT is the Fanuc 18i-TB control system. This CNC is renowned in the grinding industry for its specialized software cycles that handle complex grinding geometries with ease. It allows for nanometer-level resolution and real-time compensation, ensuring that the machine can maintain tight tolerances throughout a high-volume production run. The interface is intuitive, allowing operators to program multi-step grinding sequences including roughing, finishing, and spark-out.
Triple GMN Spindle Configuration
What sets Stock 810863 apart is its high-performance spindle package. It is equipped with three GMN electric spindles, offering speeds of 30,000 RPM, 18,000 RPM, and 12,000 RPM respectively. This configuration allows for the optimization of surface speeds (SFM) across a wide range of hole diameters (10mm to 200mm). High-speed GMN spindles are industry gold standards for their low run-out and high torque delivery, ensuring a superior surface finish that often eliminates the need for subsequent honing or polishing steps.
Integrated Gauging and Dressing
To ensure zero-defect manufacturing, the machine includes a Tokyo Seimitsu face measurement gauge. This in-process measurement tool provides feedback to the CNC system, allowing for automatic size adjustments. Furthermore, the roller dresser ensures that the grinding wheels remain perfectly sharp and correctly profiled, which is vital for maintaining accuracy over the machine's 320mm grinding length.
3. Application Cases: Solving Complex Grinding Challenges
The Taiyo Koki IGS-4NT is a workhorse in the high-precision bearing industry. For example, in the production of large-diameter spherical roller bearings, the vertical spindle allows the heavy outer race to sit naturally on the chuck, preventing the "egg-shaping" distortion that can occur on horizontal machines.
In the energy sector, this machine has been successfully used to grind internal seats for high-pressure valves. The ability to handle a swing of 4450mm over the spindle base means that even large, flanged valve bodies can be accommodated without interference, while the 320mm grinding length provides the reach necessary for deep-seated internal bores.
4. Maintenance History and Machine Integrity
Stock 810863 has been meticulously maintained under a strict Japanese industrial service schedule. The high-speed GMN spindles have undergone regular balance testing and bearing inspections to ensure silent and vibration-free operation at maximum RPM. The Fanuc 18i-TB electronics have been kept in a climate-controlled environment, preventing the typical degradation of capacitors and circuit boards. The guide-ways show minimal wear, thanks to the machine’s automatic lubrication system, ensuring that the original factory positioning accuracy is still largely intact. This unit has been fully tested and is ready for immediate deployment in a high-precision production environment.
5. Investment Value: Why Choose a Used IGS-4NT?
The primary advantage of purchasing this used Taiyo Koki IGS-4NT is the significant reduction in lead time and capital expenditure. A new machine of this caliber often requires a 6-12 month lead time and a massive financial commitment. By selecting Stock 810863, companies can integrate a world-class grinding capability into their floor within weeks.
Furthermore, the inclusion of premium components like the GMN spindles and Tokyo Seimitsu gauging adds thousands of dollars in value that would otherwise be separate line items. For a precision workshop looking to scale its quality control and output, this machine offers an ROI that is far superior to purchasing a lower-tier new machine from a less reputable brand.
6. Frequently Asked Questions (FAQ)
What is the benefit of the vertical grinding layout?
The vertical layout uses gravity to assist in part seating and eliminates spindle droop. This results in superior roundness and concentricity, especially for thin-walled or heavy workpieces.
Can the Fanuc 18i-TB be integrated into a modern network?
Yes, the 18i-TB supports standard data transfer protocols and can be networked for program uploading/downloading and basic DNC operations.
Are the GMN spindles easily repairable?
GMN is a global brand with service centers worldwide. Their modular design allows for straightforward bearing replacements and balancing services.
What is the significance of the 320mm grinding length?
This allows the machine to grind deep bores or multiple internal steps in a single setup, ensuring perfect alignment between different features of a long workpiece.
Does the machine come with the original Tokyo Seimitsu probe?
Yes, the Tokyo Seimitsu face measurement gauge is included as part of the integrated gauging system for Stock 810863.
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