HYDRAULIC DRIVE MECHANISM OF A MACHINE TOOL TABLE WITH VARIABLE TRAVEL SPEEDS

Fluid at constant pressure is delivered along pipeline a to valve spool 4. In the left-hand position of spool 4, fluid is discharged to the tank, and in the right-hand position, along pipeline b to valve spool 3. If valve spool 3 is in its left-hand position, fluid is delivered along pipeline d to the right end of cylinder 6, and piston 1, together with machine tool table 2, moves to the left. Flu…