If a precision ball screw assembly is installed or rebuilt by someone with experience, such as a reputable ball screw specialist, it should run smoothly, and it should position properly with good repeatability. Also, with the help of a pro, users of a certain piece of machinery or equipment should have a long service life. While this is true, there are some other factors that are involved after it has left the supplier or the repair shop.
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The Installation
When it comes to installing the ball screw assembly on the workshop floor, some tips may be needed. While help can be sought by contacting Dynatect, there are a few tips listed here that may be beneficial too.
When having the ball screw assembly repaired, make sure the thrust bearings (these are the angular contact bearings) and the radial bearings (these are the support bearings) are replaced as well. Usually, these can be ordered through the local bearing supply service provider, but in some situations, a machine owner will have to order directly through the manufacturer.
When installing the new ball screw assembly, there are several things to check which are explained in more detail below.
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Cleanliness
It is essential that the ball screw, the bearing journals, and the mounting surfaces remain in good condition and clean. If damage or debris are seen on these surfaces between the mounting surface and the ball nut flange on the slide or table, the ball nut may eventually become misaligned on the screw.
If this happens, it is almost guaranteed the ball screw will eventually fail. This is a very common mistake that occurs during the installation of this assembly. It’s a good idea to check carefully for any debris or small nicks on the mounting surfaces before moving forward with the installation.
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Alignment
The ball screw needs to be properly aligned using a CNC machine if a person wants it to perform properly and have any level of longevity. If the ball screw isn’t installed parallel with the slide or table, the ball nut will begin to tighten as it moves to the end of the screw. This is going to place the ball nut under significant radial load and may cause the ball screw to eventually fail.
There are some assemblies that have bearing blocks that are adjustable, while others will use shims or spacers for adjustment purposes. Make sure that a professional handles this installation to avoid alignment issues.
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Lubrication
Another common reason that ball screws fail is that there isn’t sufficient lubrication present. However, that’s not all. Other issues related to the lubrication include using the wrong lubricant, if the lubricant is contaminated, and other similar issues.
Make sure the lubrication system of the machine is working properly and clean, and avoid using moly or synthetic greases. The best way to figure out what lubricant to use is to check with the OEM -; machine manufacturer.
The ball screw is an important component of many pieces of equipment and machinery. It is necessary to ensure that the proper steps are taken when replacing or installing this assembly so that everything operates safely and properly. Keep the information here in mind to know a machine is properly repaired.
