Operating principle of the hydraulic table movement

The hydraulic table movement of a CNC grinding machine follows a precisely coordinated operating principle. When the worktable moves to the left, the pilot valve is moved to the right-hand position via the shifting fork. The hydraulic oil delivered by the constant pump flows through the pilot valve to the left adjusting regulator and is distributed there in three directions:

1. The oil reaches the left end of the directional valve and pushes the valve spool to the right – the preparation for the next reversal.
2. The oil flows through the directional valve into the left cylinder chamber.
3. The oil reaches the adjustment piston on the underside of the variable pump and changes its delivery direction.

At the same time, the oil from the right end of the directional valve and from the piston on the upper side of the variable pump flows back into the oil tank via the right adjusting throttle regulator and the pilot valve.

In the main circuit, the oil from the right chamber of the variable pump flows through the on/off valve into the right cylinder chamber and pushes the worktable to the left. The oil from the left cylinder chamber flows through the on/off valve into the suction side of the variable pump – creating a closed oil circuit.

Conclusion: This well-designed hydraulic concept ensures uniform, shock-free table movements – the basis for a smooth grind and high surface quality across the entire table length.