Sliding screw drives are less susceptible to dirt than ball screws. However, dirt should of course not get stuck on the spindle. When dirt works its way into the nut, wear usually increases. In combination with lubrication, the dirt particles can combine with the lubricant and create a “grinding paste”.
Ideally, the spindle is completely protected with a bellows or some other constructive measure.
For applications in which this is not possible for reasons of installation space or costs, the use of a wiper for trapezoidal thread spindles is a conceivable alternative.
junaspin wipers for trapezoidal thread spindles
Cast metallic wiper with rubber wiper lip
Wiper made of NBR70 (+ -5 Shore)
other sealing materials (Cr, FKM, EPDM, VMQ etc.) on request
Housing made of steel
other housing materials (aluminum, V2A, V4A) on request
junaspin will be happy to help you choose a scraper. We can also judge on the basis of our experience whether the use of a dry-running system is possible in your application.