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The guideways are mainly classified according to the nature of friction between contacting surfaces of the operative element :
(a) Guideways with sliding friction
(b) Guideways with rolling friction
13.3.1 Guideways with Sliding Friction
The friction between the sliding surfaces is called as guideways with sliding friction. These guideways are also called as slideways. The slideways are further classified according to the lubrication at the interface of contacting surfaces. The friction between the sliding surfaces may be dry, semi-liquid, and liquid. When the lubrication is absent in between contacting surfaces, it is called as dry friction. Dry friction is rarely occurred in machine tools.
When two bodies slide with respect to each other having lubrication between them, the sliding body tends to rise or float due to hydrodynamic action of the lubricant film. The principle of slider is shown in Figure 13.1.
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