Page 225 - Modular design for machine tools

Basic Knowledge of Machine Tool Joints 185

Figure 5-8 Schematic representation of foundation system.

medium-sized machine tools. In contrast, the guideway is necessary
and inevitable to provide a machine tool with the basic function, e.g.,
form-generating movement. The guideway can, in general, be classi-
fied into the three types shown in Fig. 5-9, depending upon what the
interfacial layers are, i.e., the slideway with hydrodynamic lubrication,
the hydrostatic guideway, and the rolling guideway. Of these guide-
ways, the slideway is worth actively investigating, because it is a typi-
cal variant of flat joint.
As can be seen from Fig. 5-10, a slideway consists of several flat joints,
which are well combined and configured using core parts, e.g., bed (bed
slideway), saddle (saddle slideway), gib, and keep plate in the case of the
turning machine. In due course, each joint can be replaced with the mathe -
matical model shown in Fig. 5-10. In addition, Table 5-1 summarizes the
average magnitude of the interface pressure in the slideway so far reported
3
elsewhere. In many respects, the linear ball bearing and the linear roller
bearing have recently prevailed among machine tool manufacturers across
the whole world, especially in producing the conventional MC and TC.
Importantly, some manufacturers use definitely the slideway, especially

3
For example, see N. S. Atscherkan, Werkzeugmaschinen—Berechnung und
Konstruktion, Band 1, VEB Verlag, 1961.