"Only One Technology"'"One Source, First Choice"
|Founded||January 1898 (or 15 July 1918 (as a Okuma IronWorks Co.,Ltd.))|
|Headquarters||Oguchi-cho, Aichi Prefecture, Japan|
|Employees||2,080 (April 2010)|
OKUMA (オークマ株式会社 Okuma Corporation?) is a machine tool builder based in Oguchi-cho, Aichi Prefecture, Japan. It has global market share in CNC machine tools such as CNC lathes, machining centers, and turn-mill machining centers.
|This section requires expansion. (April 2013)|
Founded in 1898 and established in 1918, 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 grinders. Okuma's Double-Column Machining Center has a large market share in Japan.
Most machine tool builders source their CNC controls from partners such as Fanuc, Mitsubishi, Siemens, and Heidenhain. Several builders have developed their own CNC controls over the years (including Mazak, Okuma, Haas, 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. For example, it has been among the leaders of development for thermal compensation and collision avoidance. 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.