HYDRAULIC DRIVE MECHANISM OF A MACHINE TOOL WITH AUTOMATIC STROKE REVERSAL

Reversible pump 1 delivers fluid from the tank to hydraulic motor 2 which rotates lead screw 8, linked to the rotor of motor 2. This feeds the drill head along the base ways. As the head travels, its trip dogs a turn reversing lever 3 together with a pinion attached to the lever. The pinion meshes with the gear rack of cylinder 4. As cylinder 4 moves to the right, the increased pressure in its lef…