Guideways of machine tools are widely used mechanisms required for machine tools to realize high precision and high-speed feeding and to support sliding components necessary for reciprocating movements, for example, in a column and a workpiece table [1,2]. Because properties of guideways determine the accuracy of machining on machine tools, studies and experiments are being carried out in a wide range of fields, including tribology. In recent years, with the diversification of machine tools, development and n improvement of guideways have been performed according to respective requirements. Among them are guideways for sliding systems operating in a wide range of lubrication conditions, from boundary lubrication to liquid lubrication, in which many tribological problems need attention. In the present work, specific features of three types of guideways, including typical guideways for machine tools, such as highly frequently used dynamically pressurized sliding guideways, statically pressurized guideways allowing realizing feed rates of high precision, and half-floating guideways with a structure intermediate between the above two structures that we consider.
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