Like all motion control devices based on contact friction, ball screws require lubrication for proper functionality. The reason is that lubrication is required for smooth recirculation of the rolling elements.
Customers often ask us: what type of lubricant is best for my ball screw application? And which is better, oil or grease? The truth is that both oil and grease can perform well in a variety of situations.
A question that often comes up for miniature ball screws – how do I lubricate it if there is no port on the ball nut? Good question! If you check our web site there is quite a lot of detailed information on lubricant types and wiper types, including precise amounts to use when re-lubricating:
Wipers wipe – right? Well, not always. As a matter of fact, many ball screws that come with “wipers” at both ends of the nut have plastic rings that don’t touch the screw surface. So they don’t wipe. They just reduce the gap between nut and screw shaft to a few tenths of a mm. And that’s ok, because most ball screws that are used in machine tools will be connected to an automatic oil (or liquid grease) supply, and the used lubricant must get out of the nut, somehow. Offering it a constant small gap means there will be controlled flushing, and that’s good – for most applications.
When it comes to real wiping Continue reading