Okuma Corporation
Native name
Company typePublic (K.K)
TYO: 6103
FoundedNagoya (January 1898; 126 years ago (1898-01))
FounderEiichi Okuma
HeadquartersŌguchi, Aichi 480–0193, Japan
Area served
Key people
Atsushi Ieki
RevenueIncrease US$ 1.305 billion (FY 2013) (JPY 134.35 billion) (FY 2013)
Increase US$ 77.22 million (FY 2013) (JPY 7.94 billion) (FY 2013)
Number of employees
3,812 (consolidated, as of March 2020)
WebsiteOfficial website
Footnotes / references

Okuma Corporation (オークマ株式会社, Ōkuma Kabushiki-gaisha) is a machine tool builder based in Ōguchi, Aichi Prefecture, Japan. It has global market share in CNC machine tools such as CNC lathes, machining centers, and turn-mill machining centers. The company also offers FA (factory automation) products and servomotors.[2]

It is listed on the Tokyo Stock Exchange and is a component of the Nikkei 225 stock index.[3]


This section needs expansion. You can help by adding to it. (April 2013)

The company was founded in 1898, as the Okuma Noodle Machine Co., to manufacture and sell noodle-making machines. Eiichi Okuma, the founder of the original company, was working on how to make udon more effectively. He was using lathe to make "sticks", that has an important role in cutting the udon noodle. But the lathes used in those days in Japan were of poor precision. This was one of big reasons which convinced Okuma to start making machine tools.[4] In 1918 Eiichi established Okuma Machinery Works Ltd. and started selling the OS lathe.

Okuma is a machine tool builder with a history of more than 100 years. Lathes were the main product category in the early days of company. The line now includes many CNC machine tools, including lathes, machining centers (mills), multitasking (turn-mill) machines, and grinding machines. Okuma's Double-Column Machining Center has a large market share in Japan.

Technological development

An Okuma MULTUS U3000 multi-tasking machine with automatic tool changer at Lampin Corporation in the Blackstone Valley of Massachusetts.
An Okuma MULTUS U3000 multi-tasking machine with automatic tool changer at Lampin Corporation in the Blackstone Valley of Massachusetts.

Most machine tool builders source their CNC controls from partners such as Fanuc, Mitsubishi Electric, Siemens, and Heidenhain. Several builders have developed their own CNC controls over the years (including Mazak, Okuma, Haas, Dalian Kede and others), but Okuma is unusual among machine tool builders for the degree to which it designs and builds all of its own hardware, software, and machine components. This is the company's "Single Source" philosophy.

Okuma's CNC control is called the "OSP" series. It offers closed-loop positioning via its absolute position feedback system. The "OSP" name began as an abbreviation for "Okuma Sampling Pathcontrol".

In an industry that pushes hard for continual technological innovation, Okuma has often been an innovative leader.[citation needed] For example, it has been among the leaders of development for thermal compensation and collision avoidance.[citation needed] Thermal compensation is designing the machine elements and control to minimize the dimensional distortion that results from the heat generated by machining. This is done both by preventing heat buildup (for example, flowing coolant through machine elements formerly not cooled) and by detecting and compensating for temperature rises when they occur (for example, monitoring temperature with a sensor and using the sensor's output signal as input to the control logic). Collision avoidance is designing the machine to predict and prevent interference, for example, having the machine "know" the form and location of all fixturing so that it can foresee a crash and stop its own movement before crashing. Recent innovation includes technology to avoid chatter, both by predicting and preventing it and by early automatic detection and correction (via dynamic changes of speeds and feeds) when it does occur.


  1. ^ "Corporate Profile". Okuma Corporation. Archived from the original on July 12, 2015. Retrieved March 26, 2015.
  2. ^ "Company Snapshot". Bloomberg Businessweek. Retrieved March 26, 2015.
  3. ^ "Components:Nikkei Stock Average". Nikkei Inc. Retrieved March 26, 2015.
  4. ^ Christian Berggren; Masami Nomura (1997). The Resilience of Corporate Japan: New Competitive Strategies and Personnel Practices. SAGE Publications. p. 151. ISBN 978-1-85396-309-4.