Product Introduction

Precision Internal Grinding Machine Series

Specializing in internal grinding machines for over 60 years!
The finest machines born from years of accumulated experience and knowledge!

A hybrid model combining the ease of use of a conventional machine with the functionality equivalent to an NC machine

The IIG Series retains the excellent mechanical properties and operability of the YIG, a standard in internal grinding machines, while incorporating the latest sequencer and scale. By visualizing the position information of the X and Z axes, achieving a roundness accuracy of 0.3 microns has become easier!

IIG-20H Large Model

Scheduled for release in 2025.
Stay tuned for the latest updates.

A standard product that has been in demand for over 60 years

Since 1962, our long-selling product has been in continuous demand for more than 60 years. As of August 2024, more than 3,000 units have been produced. The combination of excellent mechanical properties, high rigidity, and precision components enables a roundness accuracy of 0.3 microns or better.

Basic Model Ideal for Single Workpieces

This model is ideal for grinding single workpieces. The basic performance is the same as the YIG-20-MSA.

Realizing the Value of Our Products in Large Models

A large internal grinding machine model, also known as the Grinding Monster. It delivers the same value found in our products—high precision, high rigidity, and high durability—through excellent mechanical properties and operability, realized in a large model.

Our products can be customized to meet your specific requirements. A wide range of options and upgrades are available, providing optimal solutions for each manufacturing environment. You can select the best configuration based on your needs. Our expert team will support you in designing the perfect product to meet your requirements.

Our spindle heads utilize cutting-edge technology that enables high-speed and precise machining. Designed with durability and efficiency in mind, they maintain consistent performance even during prolonged operation. We offer various models to meet different machining needs, especially excelling in tasks requiring high precision. Detailed specifications and features of each model can be found here.

At Irino Machinery, selected castings from internal grinding machines manufactured by the former Yamada Koki—including the bed, base, wheelhead base, and certain machine body components—are utilized as “Legacy Castings.”
Legacy Castings are inspected according to strict quality standards, then cleaned and carefully selected. From that point forward, they undergo the same manufacturing processes as newly cast components, including grinding, scraping, assembly, and painting, and are built to current specifications.
By carrying forward the internal grinding machine technology and castings inherited from the former Yamada Koki, and combining them with Irino Machinery’s current manufacturing technology and rigorous quality control, we build new machines to the latest specifications.