Abstract
887 In heavyduty automatically controlled multifunc� tional machine tools, servo drives mounted on col� umns or on a gantry are used to move the operational components. The use of gear-rack transmissions per� mits greater motion of the operational components (more than 4 m) and high speeds. We know that the gaps in the servo drives and their inadequate rigidity impair the performance productivity of the multifunc� tional machine tool, especially in milling, when the cutting forces may exceed the frictional forces in the hydrostatic guides. Accordingly, the servo drives employed in such multifunctional machine tools often employ gear sys� tems with two output rack pinions. Such systems include a device for selecting the gaps in the transmis� sions and bearings by axial motion of the driveshaft, which is equipped with pinions that have different tooth directions (Fig. 1) (1).
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