To create through our craftsmanship skills

「Hand Scraping」

To handle hand scraping technique , long years experience is required. Because of accociated costs, hand scraping has been largely abondaned. Although hand scraping craftsman has decreased in current years in Japan, SAKURAI continuously uses this traditional technique to keep manufacturing high precision machine tools with less secular change.

The purpose of hand scraping

Hand scraping is the only method for producing an original set of flat surfaces that makes the guideways extremely accurate with an ideal flatness, squareness and straightness, and such accuracy and flatness can not be achieved by machine processing. With hand scraping, mating surfaces smoothly glide against each other and lubrication is pressed out leading to mating components, that leads to incredibly smooth sliding.

Main hand-scraped components:■Components of rotary milling machine: bed, sliding column, arm
■Components of special-purpose machine: feed unit, sliding column, mounting parts of spindles
What is hand scraping

Hand scraping is a meticulously manual technique where a highly skilled craftsman uses a carbide hand scarper to remove very small amounts of metal from a flat surface to make the guideways extremely accurate with an ideal flatness. Hand scraping contributes to accuracy of high-precision machine tools to achieve high-precisoin machining. Especially in order to achieve highly accurate flatness(within 1/1000mm), hand scraping is absolutely essential. Although precision machining technology has been developed swiftly, a flatness of high accuracy within 1/1000mm is still hard to be secured by using a high-precision equipment. Hand scraping, a meticulously manual technique, enables such flatness of high accuracy.

Assembly techniques of high speed integrated motor spindles

With the development of motor spindles , high speed integrated spindles is in great demand.
Motor spindles are carefully assembled by highly skilled and experienced craftsman, and long years experience is required for such assembly. SAKURAI has put effort into such craftmanship techniques.
With an increase in motor speed, the rotating unbalance occurs and vibration increases, which causes problems during drilling and eventually affects hole qulity. To deal with such effect, a Fast Fourier Transform (FFT) based monitoring system is applied to monitor, measure, and analyze the rotating unbalance, therefore the adjustment for the unbalance can be finely performed.

To create by 3D technology

To achieve high efficiency, high quality, and time reduction, SAKURAI uses 3D data for process designing, structure analyzing and machine manufacturing. By using the latest designing software and machining equipment, along with 70 years of accumulated knowledge, craftsmanship skills, and experience, SAKURAI continually provides high value added products.

3D design・Structure analysis


SAKURAI uses 3D CAD modeling as the main tool for designing machine tools and its core components. Customers can also provide their own 3D data for designing use. 3D visualization can help to improve technical communication between SAKURAI and its customers as well as avoiding missing the crucial details, additionally, 3D CAD software enables design and manufacturing team to identify design flaw, analyze machine structure and facial pressure strength as well as reduce prototyping cost at early stage, that makes designing and manufacturing process quicker, earlier and cost-effective.


Both 2D and 3D design data can be programmed in the CAM software and CAD data can be convertd into NC programming language directly through CAM. Furthermore, CAM is capable of transmitting a designer’s intention accurately and rapidly into machining process.

By using CAM■Siemens「Solid Edge」「NX」

Investigating virtual specification by using VR

SAKURAI uses virtual reality technology as a pre-verificating tool. Through a head-mounted display (HMD), VR technology can not only allow one to participate in the 3D distributed virtual environment to interact with different objectives, but also helps checking small interference problems and engineering access issues, which can be hardly done by only using 3D visualization. By using VR technology, a 3D life-size equipment can be created and tested, and such tests is able to verify if a machine is developed correctly before manufacturing.