A sliding guide is generally a linear guide in which the various guide elements are not separated by rolling elements . A distinction must be made between hydrodynamic, hydrostatic, aerostatic and magnetic sliding guides. These sliding guides have very different properties in terms of load capacity, friction, costs, damping and accuracy.
The sliding guides include:
- Linear plain bearings (see also: plain bearings )
- Dovetail guides (according to the shape of the dovetail connection )
- Rail guides with sliding coating , also Gleitschienenführungen called
Dovetail guide on a machine tool
While the precisely ground sliding guide of a caliper can be re- lubricated by hand with a drop of oil from time to time, most sliding guides in mechanical engineering require more complex lubrication.
Therefore, sliding guides to reduce friction can be performed, for example, with special plastic sliding linings in which u in the pores of the plastic. U. a special lubricant can be stored, which is then gradually released to the guide system during the movement .
The hydrostatic and aerostatic sliding guide ( central lubrication ) is a special design . Pumps press oil or air with a constant volume flow between the guide and the slide, which means that the distance remains the same everywhere even under load.
With hydrodynamically lubricated guides, however, the lubricating film can tear off and mixed friction can occur, which can result in stick-slip .