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Slide bearing,linear-motion bearing

2013-8-28      View:
A linear-motion bearing or linear slide is a bearing designed to provide free motion in one dimension. There are many different types of linear motion bearings.

Motorized linear slides such as machine slides, XY tables, roller tables and some dovetail slides are bearings moved by drive mechanisms. Not all linear slides are motorized, and non-motorized dovetail slides, ball bearing slides and roller slides provide low-friction linear movement for equipment powered by inertia or by hand. All linear slides provide linear motion based on bearings, whether they are ball bearings, dovetail bearings, linear roller bearings, magnetic or fluid bearings. XY Tables, linear stages, machine slides and other advanced slides use linear motion bearings to provide movement along both X and Y multiple axis.

Plain bearing
Main article: Plain bearing
Plain bearings are very similar in design to rolling-element bearings, except they slide without the use of ball bearings.
Plain bearings can run on hardened steel or stainless steel shafting (raceways), or can be run on hard-anodized aluminum or soft steel or aluminum. The specific type of polymer/fluoro-polymer will determine what hardness is allowed.
Plain bearings are less rigid than rolling-element bearings.
Plain bearings handle contamination well and often do not need seals/scrapers.
Plain bearings generally handle a wider temperature range than rolling-element bearings
Plain bearings (plastic versions) do not require oil or lubrication (often it can be used to increase performance characteristics)