With the Ball Screw, balls roll between the screw shaft and the nut to achieve high efficiency. Its required driving torque is only one third of the conventional sliding screw. (See Fig.1 and Fig.2 .) As a result, it is capable of not only converting rotational motion to straight motion, but also converting straight motion to rotational motion.
The Ball Screw is ground with the highest-level facilities and equipment at a strictly temperaturecontrolled factory, Its accuracy is assured under a thorough quality control system that covers assembly to inspection.
The Ball Screw requires a minimal starting torque due to its rolling motion, and does not cause a slip, which is inevitable with a sliding motion. Therefore, it is capable of an accurate micro feeding. Fig.3 shows a travel distance of the Ball Screw in one-pulse, 0.1-m feeding. (LM Guide is used for the guide surface.)
Since the Ball Screw is capable of receiving a preload, the axial clearance can be reduced to below zero and the high rigidity is achieved because of the preload. In Fig.5 , when an axial load is applied in the positive (+) direction, the table is displaced in the same (+) direction. When an axial load is provided in the reverse (-) direction, the table is displaced in the same (-) direction. Fig.6 shows the relationship between the axial load and the axial displacement. As indicated in Fig.6 , as the direction of the axial load changes, the axial clearance occurs as a displacement. Additionally, when the Ball Screw is provided with a preload, it gains a higher rigidity and a smaller axial displacement than a zero clearance in the axial direction.
Since the Ball Screw is highly efficient and generates little heat, it is capable of a fast feed.
Fig.7 shows a speed diagram for a large lead rolled Ball Screw operating at 2 m/s.
| ISO 3408 Compliant | Precision Caged Ball Screw | Full-Ball Type Precision Ball Screw |
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| In the DIN standard compliant Ball Screw, balls under a load roll in the raceway cut between the screw shaft and the nut while receiving the axial load, travel along the groove of a deflector embedded inside the nut to the adjacent raceway, and then circulate back to the loaded area. Thus, the balls perform infinite rolling motion | The ball cage enables this ball screw to have low noise, low torque fluctuation, and long-term maintenance-free operation. | This type of ball screw is mass-produced by cutting the standardized screw shafts of precision ball screws to fixed lengths. Additional machining of the shaft ends can easily be performed. |
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| Precision Ball Screw with Unfinished Shaft Ends | Precision Ball Screw with Finished Shaft Ends SDA-VZ | BNK Precision Ball Screw with Finished Shaft Ends |
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| This type of ball screw is mass-produced by cutting the standardized screw shafts of precision ball screws to fixed lengths. Additional machining of the shaft ends can easily be performed. | These ball screw products are fabricated with standardized shaft end shapes. The Model SDA-VZ, which features a compact, ISO-compliant nut, has been added to the lineup. These products can be used in combination with dedicated support units to make assembly design easy and significantly faster. |
The Model BNK is a ball screw with a finished shaft end machined to match the support unit. |
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| Full-Ball Type Rolled Ball Screw | Unfinished Shaft End Rolled Ball Screw | Precision Rotary Ball Screw |
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| This ball screw uses a screw shaft rolled with high precision | The use of a guide plate system provides a compact design with a round outer diameter for the nut. The screw shaft is roll-molded with a high degree of precision to ensure smooth operation. | This is a rotary-nut ball screw that has an integrated structure consisting of a ball screw nut and a support bearing. |
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| Rolled Rotary Ball Screw | Precision Ball Screw/Spline | DSP Ball Spline with Integrated Ball Screw |
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| The rotary ball screw is a rotary-nut ball screw unit that has an integrated structure consisting of a ball screw nut and a support bearing. | The ball screw grooves and the ball spline groove cross one another on a single shaft and the nuts of the ball screw and the ball spline have dedicated support bearings directly embedded on the circumference of the nuts. | The DSP transmits a large thrust with smooth motion due to the integrated structure of the linear guide ball spline and the ball screw as the drive source. |
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| Ball Screw Peripherals Support Unit | Ball Screw Peripheral Nut Bracket | Ball Screw Peripheral Lock Nut |
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| Support units are dedicated bearing components used as a set with ball screws. They come in several types: models EK, FK, EF, and FF, which are tailored to fit Model BNK and Model SDA-VZ precision ball screws with finished shaft ends; models EK-L and EF-L, which are for low shaft centers; and models BK and BF, which are standardized for general ball screws. The support unit on the fixed side includes a JIS Class 5-compliant angular bearing provided with an adjusted preload. The support unit on the supported side uses a deep-groove ball bearing. |
The nut bracket is standardized for the standard ball screw assembly provided with finished shaft ends. It is designed to be secured directly on the table with bolts. Since the height is low, it can be mounted on the table only using bolts. | The Lock Nut for the Ball Screws is capable of fastening the screw shaft and the bearing with a high accuracy. The provided hexagonal socket-head setscrew and the set piece prevent the Lock Nut from loosening and ensure firm fastening. |
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