DFU2005 ball screw nut assembly
- Min. Order:
- 1 Set/Sets
- Min. Order:
- 1 Set/Sets
- Transportation:
- Ocean, Land, Air, Express
- Port:
- Shanghai
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Contact Now| Place of Origin: | China |
|---|---|
| Productivity: | 10000 sets per month |
| Supply Ability: | 10000 sets/month |
| Payment Type: | T/T,D/P,Paypal,Western Union,Money Gram,alibaba |
| Incoterm: | FOB,DDU,CFR,CIF,EXW,FCA,CPT,DDP |
| Certificate: | ISO9001:2015 JISB1192 |
| Transportation: | Ocean,Land,Air,Express |
| Port: | Shanghai |
Cautions About Use of Ball Screws
Ball screw assemblies are delicate components. Therefore,extra care must be taken to prevent the ball track from damages that caused by edged component or tools. Meanwhile, to prevent steel ball fall out of the nut through the disassembly of screw and nut or over stroke, please be careful while operating. If the steel ball falls out, please contact with us for further instruction.Do not attempt to reassemble, which might cause permanent damage to the ball screw.)
If disassemble is required, please use a transfer pipe which has minor diameter than the screw diameter to transfer the nut to prevent falling out of the steel balls.
Key points for ball screws selection
To choose a perfect fit ball screw, users need to understand operating requirement, which is the fundamental principal of deciding the design. Besides,the main factors of selection include load weight,stroke, torque, positioning accuracy in a single time and repeatedly, rigidity, lead and nut's inner diameter.Among all the factors, any single factor's change will cause the change of other factors. Therefore, the balance between all factors is a must to pay attention
Service Life of Ball Screws
Even the ball screw is used under correct conditions, it would still fail after a period time of usage.
From the beginning to the unusable condition of ball screw, this period of time is called service life of ball screw, which is generally classified into the fatigue life when delamination phenomenon occurs and the accuracy deterioration life caused by wear-out, etc.
Direction of turns of ball screw thread
There are two directions of turn, right and left hand screws. Mostly, right turn screws are used.
Right hand screw
If you trace the groove in clockwise looking at the screw shaft in its axial direction, the ball thread is away from you.
(In the illustration, the spiral goes away from an end of the shaft.) Such screws are called right hand screws. As the illustration shows, the groove slants to the right.
If you trace the groove in clockwise looking at the screw shaft in its axial direction, the ball thread approaches to you. (In the illustration, the spiral comes near to an end of
the shaft.) Such screws are called left hand screws. As the illustration shows, the groove slants to the left.
Why do the ball screws require ball recirculation parts?
In case of a ball bearing, its steel balls roll only in a circular groove, thus there is no way for steel balls to go out of it. However, since the groove in the ball screw is helical, its steel balls roll along the helical groove, and, then, they may go out of the ball nut unless they are arrested at a certain spot.Thus, it is necessary to change their path after they have reached a certain spot by guiding them, one after another, back to their “starting point” (formation of a recirculation path). The recirculation parts play that role.
By providing steel balls in between the screw shaft and the nut (grooves), and the balls roll on the grooves (i.e.,Change to rolling contact from sliding contact to reduce friction. Refer to the illustration below.).
What is friction force? (Sliding and rolling friction)
When you want to slide a box sitting on a floor, it does not move while your pushing force is yet too small (static frictional force). But, it starts moving when the pushing force has reached a certain level. In order to keep the box moving on, you need to maintain your pushing force at its dynamic frictional force, which is far less than the static friction force.As described above, the friction force is the force that two objects exert upon each other through their contact surface and hinder each other's relative movement when they are in contact.
The intensity of frictional force varies with the state of contact. A friction force of rolling contact is usually smaller than that of sliding contact.
Product categories of Precision Rolled Ball Screw.As the professional Ball Screws manufacturer in China,we provide a complete selection of small and Large Ground Ball Screw,as well as Bi-directional Ball Screw manufacturing.Wholesale high quality Miniature Ball Screw.We have the perfect after-sales service and technical support. Look forward to your cooperation!
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