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What Should You Know Before Purchasing A Ball Screw

A ball screw consists of a screw spindle and a nut integrated with rolling elements that recirculate through a return mechanism. It is an equipment that designed to convert rotary motion into linear motion, commonly used in industrial machinery and precision machines. The ball screw is a high efficient product. Compared with a conventional sliding screw, it has drive torque of one-third or less, which makes it more suitable for saving time and motor power.

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There are varieties of different specifications of ball screws home and abroad. When you prepare to replace the wore ball screw with a new one, you need to have a good understanding of the original specifications and of the parameters you hope to enhance. KOS Industry supplies a wide range of ball screw configurations. With standard size ball-screws in stock, we could ship to you immediately. Some ball screws with special requirements need to be custom-made and need a few more days. You’s better offer us the CAD drawings or tell us the specific parameters. Following elements you should pay more attention to:

1. Accuracy grade.
According to JIS standard, 6 accuracy grade of ball screws are , from the highest precision to low precision, C0, C1, C3, C5, C7, C10. Higher precision is better for working efficiency and accuracy, however, also needs more time and more money to manufacture. You should select a ball screw with suitable accuracy grade for your machine. The grade is distinguished by the rule that any 300mm length of ball screw lead, the deviation is controlled within a certain range.
Accuracy grade C0 C1 C3 C5 C7 C10
Deviation(E300/μm) 3.5 5 8 18 50 210

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2. Ball screw lead
Ball screw lead, also referred as helix pitch, is the linear length that a screw spin one circle . It depends on the speed and the power of motor
3. Nut type and shaft end treatment
Based on the size of nut, you could decide the length of ball screw shaft and the parameters of shaft end, both supported unit (BK) and fixed-side support unit(BF). You need to inform us all the specifications by email to sales@machineballscrew.com. Some special requirements will be met by custom-making according to the machinery drawing you offer us.

4. Radial force and revolving speed
Before purchasing a set of ball screw, you should have a comprehensive understanding of its performance. The radial force and revolving speed is determined by velocity distribution(accelerate or decelerate) and the load(static load or dynamic load).
5. preload
The process of preload is for enhancing stiffness and eliminate clearance by increasing load on rolling element. This process will be finished before factory-leaving, so the customers do not need to worry just to tell us the details.
6. Life expectancy and radial load
7. The stiffness/ rigidity
According to the outer diameter and preload, the stiffness should come to a result.
8.Pretension force.
According to the outer diameter and preload, the stiffness should come to a result.

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