RACK-AND-PINION HYDRAULIC FEED MECHANISM

When piston 1 is moved by the action of fluid delivered to the end of its cylinder, its motion is transmitted through gear rack 2, rigidly attached to the piston rod, pinion 3 and worm 4 to worm wheel segment 5. Segment 5 turns with the fixture about pin A on which the workpiece is located.
$4031$THP,Dr$