Surface Grinder

Mirror Finishing


Mitsui’s surface grinder employs a ball guide system of smooth operation. It is generally said that a ball guide system is not suitable to mirror finishing because of its poor rigidity. However, our endeavor to make component parts more accurate and rigid produces a mirror surface equivalent to that produced by other guide systems.



Mitsui High-tec, Inc. supplies motor cores for automotive application with more than 1.6 million sets per year with high precision interlock technology which has been cultivated for many years.
We are committed to zero defects to our customers. We have established a Quality system to achieve zero defective products and performed the best quality production output.
We have received various Supplier Awards for Quality and On-Time Delivery from customers all over the world. Using Mitsui’s fine dies enable lamination with materials its external diameters greater than 200 mm or with materials as thin as 0.3mm and produce high quality motor cores.

5 Years

Production line (Satisfy products nano precision requirment) to provide customers with stable quality

Granite surface was placed on the Precision Machine Tools production floor.
Granite surface is usually used as a measuring equipment.
In order to produce nano precision, we realized to assemble it on the measuring equipment.
Marble’s characteristics was applied.

  • Small thermal expansion
  • Small aging changes
  • No rust
  • No burr

Machines procuded on the granite surface plate floor was floating by the air. Refer to photo. (left)