HYDRAULIC DRIVE MECHANISM OF A MACHINE TOOL TABLE

Gear pump 6 delivers fluid at constant pressure to the left end of cylinder 1, and piston 2, together with machine tool table 3, travels to the right. Fluid exhausted from the right end of cylinder 1 passes to rotary valve 4 and to valve spool 5. If valve 4 is positioned so that pipeline a is closed and pipeline b is open, the discharged fluid drains to the tank and table 3 travels at maximum spee…